Optimization of a plasmonic lens structure for maximum optical vortices induced on Weyl semimetal surface states Ritwik Banerjee and Tanmoy Maiti, Nanoscale Advances, (2024) [I.F. 4.6].
Optical vortex creation is regarded as a significant source for information transmission for applications in quantum computing, encryption, optical communication, etc. Here, we have posited a unified mathematical formulation for electric field intensity and phase distribution of 2D lattice of optical vortices generated from various polygonal plasmonic lens structures using surface states of Weyl semimetal (MoTe2). Our theoretical calculation corroborates well with the FDTD simulation validating the proposed generalized formula. Such plasmonic lens structures demonstrating scaling behavior offer great potential for designing next generation optical memories.
Enhanced thermoelectric performance with improved mechanical strength in Bi2S3/graphite composites Farheen Anjum, Pragya Dixit, Tanmoy Maiti, Carbon Volume 218, 31 January 2024, 118692, (2024) [Awarded as Devi Best PhD Paper Award by IITK][I.F. 10.5].
Here we have shown that composite route for improving the electron transport of Bi2S3 by incorporating graphite. Inclusions of Graphite in Bi2S3, provides a conductive pathway for the easy transport of electrons, and leads to a surge (111 times) in electrical conductivity. Thermoelectric device figure-of-merit, ZT is enhanced by 3 times.
Thermoelectric behavior of (Ba0.2Sr0.2Ca0.2La0.2Na0.2)CoO3 high entropy cobaltate-based perovskite Tathagata Bhattacharya, Ritwik Banerjee and Tanmoy Maiti , Physical Chemistry Chemical Physics, (2024) [I.F. 2.9].
Novel high entropy cobaltate based perovskite has been synthesized for the first time. It exhibits ultralow thermal conductivity caused by multi-phonon scattering, which can be used for high temperature thermoelectric applications. Single phase solid solution of High entropy cobaltate has been achieved based on detailed thermodynamic calculations shown in this paper, which can be used for designing novel high entropy oxides
Band-Structure Modification Leads to Enhanced Thermoelectric Performance of Bi2S3 by CaCl2 Doping Farheen Anjum, Dipanwita Bhattacharjee, Amrita Bhattacharya and Tanmoy Maiti ACS Applied Energy Materials 7 (8), 3166-3174, (2024) [I.F. 5.5].
We have demonstrated 3-times ZT enhancement of Bi2S3 using alkaline-earth metal halide, CaCl2. This is the first report of employing alkaline-earth metal halide doping to enhance thermoelectric performance of Bi2S3. Understandably, alkaline-earth metals are not expected to infuse high density electrons in the system compared to noble metals, which probably acts as deterrent in selection of halide dopant for Bi2S3. Here, we have shown more than 370 times enhancement of electrical conductivity of polycrystalline Bi2S3via the incorporation of CaCl2. Using DFT calculation, we have shown that CaCl2 doping in Bi2S3induces multiple valley degeneracies in conduction band of Bi2S3, which was otherwise not present in pristine sample, facilitating smoother electron transport in doped system.
Data-Driven Approach to Accelerate the Design of Halide Perovskite for Photovoltaic Application Using Electronic Properties as Descriptors Shivam Aggarwal, Bharadwaj Jayam and Tanmoy Maiti, Energy Technology 2301284, (2024) [I.F. 3.8].
Here we have used ML to design high performance halide perovskite solar cell. We have introduced a new approach called ‘Positional average elemental property (PAEP)' in ML which eventually helped us to predict perovskite compositions with multiple cations. We present a table of new compositions of perovskite solar cell with potential of high energy conversation efficiency.
High temperature thermoelectric properties of BaxSr2−xFeCoO6 double perovskites T. Bhattacharya, and T. Maiti, Physica Scripta 99, 1159101, (2024) [I.F. 2.6].
Environmentally benign BaxSr2-xFeCoO6 (BSFC) double perovskites are synthesized via solid-state reaction route for high-temperature thermoelectric applications. Substituting Ba for Sr in Sr2FeCoO6 increases the Seebeck coefficient (S) but at the expense of the electrical conductivity (σ). The thermoelectric power factor has been enhanced by over 50% with Ba substitution in Sr2FeCoO6. Electron transport in these double perovskites is found to follow the small polaron hopping conduction mechanism.
Intermediate-spin state of Co ions in magnetic and thermoelectric properties of double perovskite Ba2CoNbO6 DV Popov, RG Batulin, MA Cherosov, IV Yatsyk, TI Chupakhina, Yu A Deeva, AS Makarchenko, DI Fazlizhanova, VA Shustov, RM Eremina, T Maiti Journal of Alloys and Compounds 176900, (2024) [I.F. 5.8].
Elevated temperature thermal and electrical properties of carbon nanotubes, graphite and graphene reinforced (Zr-Ta-W-Ti) C-SiC based high entropy carbide ceramics D Rana, V Xavier, SS Jana, T Maiti, V Thiruvenkatam, K Balani, Materials Today Communications, 38, 108434, (2024) [I.F. 3.7].
ESR and magnetization studies of double perovskite SrFeNbO6 D V Popov, R Batulin, M A Cherosov, I V Yatsyk, T Chupakhina, Y Deeva, R. M. Eremina and T. Maiti, Journal of Magnetism and Magnetic Materials, Volume 595, 1 April 2024, 171611, (2024) [I.F. 2.7].
Device Structure Optimization for Rb2SnI6-Based Halide Perovskite Solar Cell Using SCAPS S Aggarwal, T Maiti, IEEE Electron Devices Technology & Manufacturing Conference (EDTM), 1-3 (2024).
This work demonstrates an exciting approach to design a thermoelectric material utilizing high entropy effect. For the first time, we have designed a novel tungsten bronze structure type high entropy oxide for the thermoelectric applications. We have determined the phase stability of the HETB by using thermodynamic calculation. Led by multi-phonon scattering due to presence of 5 cations in HETB, we have been able to reach ultralow thermal conductivity, which is the lowest ever reported value in high entropy oxide thermoelectrics. Increased Seebeck coefficient and ultralow thermal conductivity synergistically allow HETB to attain maximum ZT performance among high entropy oxide thermoelectrics.
Enhanced thermoelectric performance of rare-earth-free n-type oxide perovskite composite with graphene analogous 2D MXene Pragya Dixit, Subhra Sourav Jana and Tanmoy Maiti, Small, 19, 2206710 (2023) [Awarded as Devi Best PhD Paper Award by IITK][I.F. 15.153].
Here we have shown for the first time that MXene can be used to enhance the thermoelectric performance of doped SrTiO3 perovskites. By forming composite with 2D MXene we could get single-crystal like electron mobility in polycrystalline composite by successfully delocalizing the electrons in Nb doped SrTiO3 in which electrons otherwise suffer from Anderson's localization. As a result we could achieve 1851% increase in electrical conductivity and 1000% enhancement of thermoelectric power factor. Further, MXene incorporation led to enhanced Umklapp scattering giving rise to lower lattice thermal conductivity. Hence 700% ZT enhancement is observed. Subsequently we made a prototype of 4-legged thermoelectric power generator (TEG) and obtained 38mW power output, which is much higher than the reported values for oxide TEG. Our result thus opens up a new avenue of designing novel thermoelectric composites using MXene.
Rare earth free Oxide nano-composite of SrTi0.85Nb0.15O3 and CNT for potential n-type Thermoelectrics Subhra Sourav Jana and Tanmoy Maiti, Carbon, 202(2), 207 (2023) [I.F. 10.9].
This is the first report on thermoelectric properties of oxide perovskite composites with CNT. CNT is proven to be effective to overcome the Andersons localization of electrons prevalent in doped SrTiO3. We have reported more than 1000 % increase in electrical conductivity of Nb doped SrTiO3 after CNT addition. This remarkable enhancement of electrical conductivity accompanied by essentially no change in Seebeck coefficient leads to a 380 % increase in the thermoelectric figure-of-merit, ZT. Although CNT has been previously introduced in chalcogenides, binary oxides, and oxy-chalcogenides, such a remarkable surge in electrical transport with the incorporation of a small amount of CNT has never been reported.
Enhanced Thermoelectric Performance in the SrTi0.85Nb0.15O3 Oxide Nanocomposite with Fe2O3-Functionalized Graphene S. S. Jana, D Chatterjee and T. Maiti, ACS Applied Materials & Interfaces 15 (41), 48246-48254, (2023) [I.F. 9.5].
Here we have shown 420% increase in thermoelectric figure of merit, ZT of Nb doped SrTiO3 by making composite with Fe2O3-functionalized Graphene. Incorporation of Functinalized graphene facilitates the Andeson's localized electrons of doped STO to attain the itinerant state causing 1185% enhancement of electrical conductivity. Further it helped us to decrease lattice thermal conductivity of doped SrTiO3 by 34% due to enhance phonon scattering. Functionalized graphene proved to be better option for ZT enhancement of oxide perovskites rather than using simple graphene.
Effect of MXene Addition on the Thermoelectric and Mechanical Properties of Skutterudite CoSb3 P Dixit, S Ghosh, RC Mallik, T Maiti, ACS Applied Energy Materials 6 (23), 12105-12113, (2023) [I.F. 6.4].
This is our first effort on making composite of in-house synthesised MXene with Skutterudites for thermoelectric applications. We could enhance ZT values of CoSb3 by 137% by synergistic improvement of electrical conductivity along with enhanced phonon scattering in composite samples. Beside we could enhance hardness of these skutterudite samples singnificantly. Our results provide a novel way of designing high performance skutterudites based thermoelectric materials via composite route with MXene.
Synergistic Improvement in Thermoelectric Performance by Forming Environmentally Benign Transition Metal Oxide Composites with Graphite Subhra Sourav, Jana Sunita Kumari, Tanmoy Maiti The Journal of Physical Chemistry C 127 (27), 12849-12856, (2023) [I.F. 4.177].
This work was started with Sunita's M.Tech thesis. Here we have shown that graphite does magic even in simple transition metal oxide like TiO2 to enhance its thermoelectric figure of merit by 140%. Graphite basically helps in reducing Schottky barrier height which we further proved with percolation model.
Study of charge transport mechanism in Ba doped Sr2CrMoO6 double perovskite mixed ionic electronic conductor Vivek Kumar, Sudha Saini and Tanmoy Maiti, Journal of Applied Physics 133, 164104 (2023) [I.F. 2.877].
Here basically we unraveled the charge transport mechanism of double perovskite mixed ionic electronic conductor (MIEC), which can be used for various applications such as in batteries, sensors, catalysis, solid oxide fuel cells (SOFCs), etc.
Optimal synthesis, fine-scale microstructural characterization, and property estimation of reactive-spark plasma sintered bulk multicomponent (Nb, Ti, Zr, Cr) B2 R Mitra, T Maity, N Sharma, K Tiwari, T Maiti, K Biswas Journal of Materials Research 38 (8), 2122-2136, (2023) [I.F. 2.909].
Magnetic properties of the double perovskite Sr 2CoNbO 6-δ D. V. Popov, R. G. Batulin, M. A. Cherosov, I. V. Yatsyk, T. I. Chupakhina, Yu. A. Deeva, R. M. Eremina, T. Maiti Magnetic Resonance in Solids, 25 (3), 23301 (9 pp.) (2023).
Magnetic Properties of the Double Perovskite Sr2CrNbO6 D V Popov, R Batulin, M Cherosov, IV Yatsyk,T Chupakhina, Y Deeva, I Fazlizhanov, R. M. Eremina and T. Maiti, Journal of Experimental and Theoretical Physics , 137(4), 555–561, (2023) .
Magnetic Phase Separation in Double Perovskite Sr2TiMnO5.87 D. V. Popov, I. V. Yatsyk, R. G. Batulin, M. A. Cherosov, I. R. Vakhitov, I. A. Faizrakhmanov, R. V. Yusupov, T. I. Chupakhina, Yu. A. Deeva, I. I. Fazlizhanov, T. Maiti & R. M. Eremina Applied Magnetic Resonance 54 (4), 561-580, (2023).
Enhanced Thermoelectric Performance in Oxide Composites of La and Nb Codoped SrTiO3 by Using Graphite as the Electron Mobility Booster Subhra Sourav Jana and Tanmoy Maiti, ACS Applied Materials & Interfaces, 14, 14174 (2022) [I.F. 10.383].
This is our 2nd paper demonstrating the composite route by using graphite in Perovskite matrix to achieve 423% increment in thermoelectric figure of merit, ZT. Graphite helps in delocalising electrons in La-Nb co-doped SrTiO3 in which electrons suffer from Anderson’s localization causing order of magnitude increase in electron mobility. Further we have demonstrated mW-level power output using just 4 -legs of this n-type composite, which is much better than micro watts attained in oxide thermoelectrics.
Low Lattice Thermal Conductivity in a Wider Temperature Range for Biphasic-Quaternary (Ti,V)CoSb Half-Heusler Alloys N. S. Chauhan, D. Bhattacharjee, T. Maiti, Y. V. Kolen’ko, Y. Miyazaki, A. Bhattacharya, ACS Applied Materials & Interfaces, 14, 54736 (2022) [I.F. 10.383].
Intrinsically high lattice thermal conductivity has remained a major bottleneck for achieving a high thermoelectric figure of merit (zT) in state-of-the-art ternary half-Heusler (HH) alloys. In this work, we report a stable n-type biphasic-quaternary (Ti,V)CoSb HH alloy with a low lattice thermal conductivity κL ≈ 2 Wm−1K−1 within a wide temperature range (300−873 K). This study upholds the new possibilities of finding biphasic-quaternary HH compositions with intrinsically reduced κL for prospective thermoelectric applications.
A facile pot synthesis of (Ti3AlC2) MAX phase and its derived MXene (Ti3C2Tx) Thermoelectrics P. Dixit and T. Maiti, Ceramics International, 48(24), 36156 (2022) [I.F. 5.532].
We have discovered a new, low-cost synthesis route for MAX and MXene. We have filed an Indian Patent for the same as well. Synthesizing graphene analogous 2D material MXene with high purity is prerequisite for realizing its huge potential in various electronic and electro-optic applications. However, it has always been challenging to prevent the oxidation of metals during fabrication of MAX phase which eventually leaves the ‘defect’ imprint on 2D MXene. Here we have shown a novel, simple and low-cost processing technique for fabricating high purity 2D MXene sheet showing Accordion like open layered structure.
Enhanced thermoelectric power factor led by isovalent substitution in Sr2CrMoO6 double perovskite S. Saini, M. Saxena, T. Bhattacharya, A. Saha and T. Maiti, J. Phys. D: Appl. Phys. 55, 415501 (2022) [I.F. 3.409].
Donor or acceptor doping using aliovalent cations in perovskites is the popular strategy for increasing the carrier concentration in order to improve the electrical conductivity, however that works at the expense of Seebeck coefficient. In this paper, we have shown that isovalent substitution can enhance the electron transport by manipulating the oxidation states of transition metals in perovskites, which can be the potential way of increasing the thermoelectric power factor of other oxides.
Temperature-dependent excitonic emission characteristics of lead-free inorganic double perovskites and their third-order optical nonlinearities A. Singh, P. Dey, A. Kumari, M. K. Sikdar, P. K. Sahoo, R. Das and T. Maiti, Physical Chemistry Chemical Physics (PCCP), 24, 4065 (2022) [I.F. 3.945].
Here we report for the first time, 3rd-order optical nonlinearities in lead-free inorganic halide double perovskites. This is collaborative work with NISER Bhubaneswar.
Domination of Phononic Scattering in Solid Solutioning and Interfaces of HfB2–ZrB2 – SiC -Carbon Nanotube Based Ultra High Temperature Composites S. Dubey, Ariharan S, A. Nisar, S. Saini, S. S. Jana, B. Wangaskar, A. Das, S. Khandekar, T. Maiti, S. Omar, and K. Balani , Scripta Materialia, 218, 114776 (2022) [I.F. 3.945].
High performance (ZT>1) n-type oxide thermoelectric composites from earth abundant materials
M. Acharya, S. S. Jana, M. Ranjan and T. Maiti, Nano Energy, 84, 105905 (2021) [I.F. 19.069].
Here we report A Major Breakthrough in the field of Oxide Thermoelectrics. We present the first experimental demonstration of ZT>1 in oxide thermoelectrics by engineering a rare-earth-free composite of Nb-doped SrTiO3 with Graphite. Using the concept of delocalizing electrons in oxides which suffer from Anderson's localization, we could achieve 250 times enhancement in the electrical conductivity primarily due to 21-times increase in mobility of electron. Moreover, we could keep the thermal conductivity in check by inducing phonon-glass-like temperature-independent phonon mean-free-path above Debye temperature of these composites, resulting in 15 times enhancement in ZT. Our simulation results suggest the potential of these oxide composites to generate kW-level electricity from MW-level waste heat present in manufacturing industries. This potentially opens up a new avenue of designing thermoelectric power generator to convert high temperature (>1000 K) waste heat into electricity.
Performance Analysis and Optimization of a SnSe-Based Thermoelectric Generator M. Bhattacharya, M. Ranjan, N. Kumar, and T. Maiti, ACS Applied Energy Materials, 4, 8211−8219 (2021) [I.F. 6.959].
Here we have posited the idea of using only p-type SnSe legs instead of traditional n-p leg architecture in TEG. In general n-type TE materials exhibit inferior performance compared to p-type which eventually causes the lower efficiency reported for TEG. Our proposed device architecture provides a new efficient way of designing TEG for electricity generation from waste heat.
Compositional Fluctuations Mediated by Excess Tellurium in Bismuth Antimony Telluride Nanocomposites Yield High Thermoelectric Performance N. S. Chauhan, S. V. Pyrlin, O. I. Lebedev, L. S. A. Marques, M. M. D. Ramos, T. Maiti, K. Kovnir, B. A. Korgel, and Y. V. Kolen’ko, The Journal of Physical Chemistry C (JPCC), 125, 20184–20194 (2021) [I.F. 4.177].
A high thermoelectric figure of merit (ZT) in state-of-the-art bismuth antimony telluride (BST) composites was attained by an excess tellurium-assisted liquid-phase compaction approach. Herein, we report a maximum ZT of ≈ 1.4 at 500 K attained for BST bulk nanocomposites fabricated by spark plasma sintering of colloidally synthesized (Bi,Sb)2Te3 platelets and Te-rich rods. The Te-rich nanodomains and antimony precipitation during sintering result in compositional fluctuations and atomic ordering within the BST–Te eutectic microstructure, which provides additional phonon scattering and hole contributions.
The analysis of charge transport mechanism in mixed ionic electronic conductor composite of Sr2TiCoO6 double perovskite with yttria stabilized zirconia S. Saini, K. Balani, and T. Maiti, Journal of Physics: Condensed Matter, 33 (31), 315703 (2021) [I.F. 2.707].
Here we report the charge transport mechanism using Universal dielectric response (UDR) in MIEC perovskite composites for potential application as SOFC anode.
We have analyzed complex frequency-dependent AC conductivity data using Almond West (AW) power law; used Barton Nakajima and Namikawa (BNN) relation and the time-temperature superposition principle (TTSP) to find crossover from AC to DC conduction and finally Krammer-Kronig transformation connects the dielectric strength with conductivity relaxation and verifies the impedance data.
Formamidinium containing tetra cation organic-inorganic hybrid perovskite solar cell
H. Singh, P. Dey, S. Chatterjee, P. Sen, and T. Maiti, Solar Energy, 220, 258–268(2021) [I.F. 7.188].
Here we reported excellent stability of organometallic halide perovskite solar cell with reasonable energy conversion efficiency by using tetra-cation including Na/K in B-site of perovskite solar cell. We have used f-TAS to unravel the ultrafast carrier dynamics in these perovskites. Interestingly use of Na instead of K shows better efficiency due to better control of the free electron-hole recombination and Auger recombination process in these perovskite solar cells.
High-Entropy Perovskites: An Emergent Class of Oxide Thermoelectrics with Ultralow Thermal Conductivity
R. Banerjee, S. Chatterjee, M. Ranjan, T. Bhattacharya, S. Mukherjee, S. S. Jana, A. Dwivedi, and T. Maiti, ACS Sustainable Chemistry & Engineering 8, 17022 (2020) [I.F. 9.224].
[Featured as Cover Article in ACS Sustainable Chemistry & Engineering ]
High Entropy Materials appeared to have exciting prospects for various applications. Here, we report for the first time the application of High Entropy Perovskites for thermoelectric power generation. Ultralow thermal conductivity of 0.7 W/mK at 1100 K was achieved in this n-type rare-earth-free HEP oxide thermoelectric material. The concept of designing HEP to achieve ultra-low thermal conductivity potentially opens up a new avenue for enhancing thermoelectric performance of environmentally benign bulk oxides for high temperature thermoelectric power generation.
Effect of semiconductor to metal transition on thermoelectric performance in oxide nanocomposites of SrTi0.85Nb0.15O3 with graphene oxide
P. Dey, S. S. Jana, F. Anjum, T. Bhattacharya, and T. Maiti, Applied Materials Today, 21, 100869 (2020) [I.F. 8.663].
Here we have shown that manipulating metal-semiconductor transition one can enhance thermoelectric power factor significantly. We could achieve high ZT in oxide perovskite by making composite with Graphene Oxide. GO sheets embedded in the grain boundaries of polycrystalline STN facilitated electron transport without increasing much it’s thermal conductivity, resulting in 50 times enhancement in ZT due to GO incorporation. Maximum ZT of 0.5 was attained at 1200K in n-type bulk oxide nanocomposite made of environmentally benign, earth-abundant elements.
Effect of B-site cation ordering on high temperature thermoelectric behavior of BaxSr2− xTiFeO6 double perovskites.
D. S. Gyan, V. Sundram, A. Dwivedi, S. Bhowmick, and T. Maiti,
Journal of Physics: Condensed Matter 32 (23), 235401 (2020) [I.F. 2.745].
[Featured as Cover Page in JPCM]
Here we have shown that manipulating octahedral ordering in double perovskites one can enhance the thermoelectric power factor. With the help of DFT and high temperature XRD, we could decode that local clustering of Fe-octahedra is responsible for semiconductor to metal transition in BSTF double perovskites, which has opened up a new avenue of designing low-cost oxide thermoelectric materials.
Device modeling and performance optimization of thermoelectric generators under isothermal and isoflux heat source condition.
M. Ranjan and T. Maiti, Journal of Power Sources, 480, 228867 (2020) [I.F. 9.794].
The research area of TEG device simulation is still at its infancy. No one has ever reported TEG device simulation under constant heat flux condition which is generally found in the real application like furnace walls or exhaust gas in manufacturing industries, automobiles etc. Here we have optimized the TEG device parameters using FEM in conjugation with Taguchi method to maximize power output and efficiency of TEG under both isothermal and iso-flux condition.
Reversible Growth of Mixed Lead-Bismuth Hybrid Perovskite Nanocrystals – Presence of Dynamic Capping
S. Chatterjee, P. Dey, N. Das, K. Tiwari, T. Maiti and P. Sen, Chemistry - A European Journal, 26, 1-6 (2020).
The research area of TEG device simulation is still at its infancy. No one has ever reported TEG device simulation under constant heat flux condition which is generally found in the real application like furnace walls or exhaust gas in manufacturing industries, automobiles etc. Here we have optimized the TEG device parameters using FEM in conjugation with Taguchi method to maximize power output and efficiency of TEG under both isothermal and iso-flux condition.
Magnetic and Electron Spin Resonance Properties of BaxSr2‐xTiCoO6D ouble Perovskites.
D. S. Gyan, M. Saxena, R. M. Eremina, I. I. Fazlizhanov, D. V. Mamedov, I. V. Yatsyk, A. K. Shukla, A. Dwivedi, and T. Maiti,
Phys. Status Solidi B, 257, 1900341 (2020) [I.F. 1.782].
This is our efforts to decode the magnetism in BSTC double perovskite in collaboration with IITBHU and Kazan Scientific Center of RAS.
Organic-inorganic hybrid halide perovskites impregnated with Group 1 and 15 elements for solar cell application.
P Dey, H Singh, RK Gupta, D Goswami, and T. Maiti, Journal of Physics and Chemistry of Solids, 144, 109518 (2020) [I.F. 4.383].
In the current investigation we synthesized two novel perovskite materials, Methylammonium potassium bismuth lead iodide [CH_3 NH_3 K_0.25 Bi_0.25 Pb_0.5 I_3] (MKBPI) and Methylammonium sodium bismuth lead iodide [CH_3 NH_3 Na_0.25 Bi_0.25 Pb_0.5 I_3] (MNBPI). Fluorescence decay kinetics study revealed charge carrier lifetime on the order of nano second. Degradation studies were carried out by XRD, UV–Vis and DSC-TGA over 15 days. Remarkably thin films of these perovskites exhibited good stability even after 2 weeks.
Reversible Ultra-Slow Crystal Growth of Mixed Lead Bismuth Perovskite Nanocrystal–Presence of Dynamic Capping.
S. Chatterjee, P. Dey, N. Das, K. Tiwari, T. Maiti, P Sen
Chemistry–A European Journal 26 (7), 1506-1510 (2020) [I.F. 5.02].
An ultra‐slow crystal growth process of a newly synthesized perovskite nanocrystal until 24 hours in a normal antisolvent medium is reported here. The crystal growth is observed through successive spectral evolutions in a macroscopic as well as in a microscopic regime. Through the reversibility in temperature dependence we have proved that the crystal growth is mediated by the dynamic capping.
Design of Scalable Optical Decoder based on Hexagonal Plasmonic Modes induced on Topological Insulator Surface States.
S. Srivastava, P. Jain, and T. Maiti, Scientific Reports,9, 9190 (2019), [I.F. 4.996]
Here we have proposed a novel design of Optical Memory based on 2D optical lattice of scalar vortices obtained from a Hexagonal Plasmonic Lens encrypted on the surface of a Topological Insulator (BiSbTeSe). Analogous to Moore’s Law vis-à-vis electronic memories, Scaling of the Optical Memory has been proposed via increasing area density of vortices.
Double perovskite (Sr2B'B''O6) oxides for high-temperature thermoelectric power generation—A review Tanmoy Maiti, Mandvi Saxena, Pinku Roy
Invited review on Double perovskite based thermoelectrics in JMR
Focus issue on EARLY CAREER SCHOLARS IN MATERIALS SCIENCE
Enhancement of thermoelectric power factor by inducing octahedral ordering in La2-xSrxCoFeO6 double perovskites.
K. Tanwar, D. S. Gyan, S.Bhattachary, S. Vitta, A. Dwivedi, and T. Maiti,
Physical Review B. 99 (17), 174105 (2019) [I.F. 3.908].
Here we have shown for the first time that inducing octahedral ordering in a band insulator type double perovskite one can achieve reasonable electrical conductivity to get good thermoelectric power factor and figure of merit, (ZT).
Effect of Bi doping on high temperature thermoelectric properties of Sr2TiCoO6
M. Acharya and T. Maiti,
Ferroelectrics. 532 (1), 28 (2019 .
Far field super-focusing along with enhanced near field emission from hybrid spiral plasmonic lens inscribed with nano corrals slit diffractor P. Jain, and T. Maiti,
Scientific Reports (Nature), 8, 1127 (2018) .
Role of GO and r-GO in resistance switching behavior of bilayer TiO2 based RRAM Siddharth Srivastava, Pritam Dey, Shiva Asapu, and Tanmoy Maiti.
Conductive filament model explaining the role of GO and r-Go in resistance awitching behaviour of TiO2-based bilayer heterostructure RRAM
Structure and thermoelectric properties of calcium doped Sr2TiCoO6 double perovskites
Sudha, M. Saxena, K. Balani, and T. Maiti, Materials Science and Engineering: B. 244, 65-71 (2019) [I.F. 3.407].
Synthesis and thermoelectric properties of Ba2TiFeO6 double perovskite with insight into the crystal structure
D. S. Gyan, A. Dwivedi, P. Roy and T. Maiti, Ferroelectrics 536 (1), 146-155 (2018)
Far field superfocusing along with enhanced near field emission from hybrid spiral plasmonic lens inscribed with nano corrals slit diffractor Priyanshu Jain, Tanmoy Maiti
Here we proposed a novel hybrid spiral plasmonic lense with long focal length and
subwavelength size beam spot offering a satisfactory working distance for various
novel applications such as super resolution microscopy, nano lithography, bioimaging
and sensing, optical tweezers, quantum communications, microfluidic lab-on-chip,
angular momentum detectors, etc
Role of structural distortion on thermoelectric aspects of heavily Sr2+ doped GdMnO3 Khagesh Tanwar, Farheen Anjum, Ashutosh K. Shukla, and Tanmoy Maiti
The is Prequel to our Scientific Reports
Paper on Nano-corral Slits Plasmonic Lens.
Spectral Studies of Lead-Free Organic-Inorganic Hybrid Solid-State Perovskites CH3NH3Bi2/3I3 and CH3NH3Pb1/2Bi1/3I3: Potential Photo Absorbers P Dey, V Khorwal, P Sen, K Biswas, Tanmoy Maiti
Here we have shown that Bi-based Lead-free organic-inorganic hybrid halide
perovskites can be stable even after 48 days, which can pave way for the development
of low-cost, stable and highly efficient perovskite solar cell.
Colossal change in thermopower with temperature driven pn type conduction switching in LaxSr2-xTiFeO6 double perovskites P Roy,T Maiti
Owing to their enormous change in thermopower on the order of mV/K coupled with p-n
type resistance switching, LSTF double perovskites can be used as switches,
thermistors, thyristors, thermal runaway monitors. It can also be used for chemical
to thermal to electrical energy conversion on the basis of recently developed
thermopower wave concept.
Enhancement of thermoelectric power factor of Sr2CoMoO6 double perovskite by annealing in reducing atmosphere Khagesh Tanwar, Mandvi Saxena and Tanmoy Maiti
"3-D multifilamentary rupturemodel" has been
developed in a transition metal oxide-based RRAM. Four
different resistance states have been achieved by using
three conduction filaments and their subsequent rupture,
thus realizing the multiple resistance levels. By varying
VSTOP, it has also been verified that the states thus obtained
were because of the direct consequence of the conduction
filaments.
Effect of Spark Plasma Sintering (SPS) on the thermoelectric properties
of SrTiO3 :15 at% Nb P. Roy, V. Pal, T. Maiti.
Large change in thermopower with temperature driven p-n type conduction switching in
environment friendly BaxSr2-xTi0.8Fe0.8Nb0.4O6 double perovskites.
P. Roy, V. Waghmare, K. Tanwar, T. Maiti.
Temperature driven p-n type conduction switching in combination with colossal change in thermo-power in
BaxSr2-xTi0.8Fe0.8Nb0.4O6 (BSTFN) double perovskites.
Metal-like electrical conductivity in LaxSr2-xTiMoO6 oxides for high
temperature thermoelectric power generation.
M. Saxena and T.Maiti.
Increasing electrical conductivity in oxides, which are inherently insulators, can be a potential route in developing oxide-based
thermoelectric power generators with higher energy conversion efficiency.
Environmental friendly Sr2TiMoO6 double perovskite for high
temperature thermoelectric applications.
M. Saxena, K. Tanwar and T. Maiti,.
Scripta Materialia, 130, 205-209 (2017) [I.F. 6.302]. (pdf)
Effect of Ba-doping on high temperature thermoelectric properties of Sr2TiMoO6
double perovskites. M.saxena and T.maiti.
Journal of Alloys and Compounds 710, 472-478, (2017) [I.F. 6.371].(pdf)
Enhanced thermoelectric figure-of-merit in environmentally benign
BaxSr2-xTiCoO6 double perovskites. M. Saxena, P. Roy, M. Acharya, I. Bose, K. Tanwar and T. Maiti.
Here we have shown that inducing relaxor ferroelectricity with high Burns temperature (TD) resulting dipolar spin glass
can be alternative route of engineering novel thermoelectric materials with high figure of merit.
Environmentally friendly BaxSr2-xTiFeO6 double perovskite with
enhanced thermopower for high temperature thermoelectric power generation. P. Roy, V. Waghmare and T. Maiti.
SrTiO3 based double perovskites, BaxSr2-xTiFeO6 (BSTF) compositions
exhibit very large thermo-power (S~800 μV/K) which can be instrumental in designing novel materials for high
temperature thermoelectric power generation.
Electrothermal numerical modeling of multifilamentary conduction in
Ta2O5-x/WO3-xbilayer oxides based RRAM. S. Asapu and T. Maiti.
In the present work, a "2D multifilament rupture model" has been developed on heterogeneous
bilayered dielectric stack of Ta2O5-x/WO3-x resistive-RAM (RRAM) or
resistive switching (RS) cell. Finite element method (FEM) has been
used to solve a set of 3 self-consistent partial differential equations
(PDEs) using a numerical solver.
Synthesis and characterization of Sr2TiMO6 (M=Fe,Co) double perovskites for high
temperature thermoelectric applications. P. Roy, I. Bose and T. Maiti.
The prospects of double perovskites based materials as the
candidate for high temperature thermoelectric materials were
investigated. Among the various complex perovskites, SrTiO3
based oxides had shown great potential for thermoelectric
applications. In the current investigation, Sr2TiMO6 (M = Fe, Co)
based double perovskites were synthesized using conventional
solid-state route.
T. Maiti, R. Guo, and A. S. Bhalla, "Evaluation of Experimental Resume of BaZrxTi1-xO3
with Perspective to Ferroelectric Relaxor Family: An Overview," Ferroelectrics, 425, 4-26 (2011). (2nd Most Read paper in
Ferroelectrics since 2011; according to Ferroelectrics journal website)
N. K. Karan, T. Maiti, R. Guo, A. S. Bhalla, and R. S. Katiyar, "Micro-Raman Spectra Studies of Zr4+ rich
BaZrxTi1-xO3 (0.5 <= x <= 1.00) Phase Diagram," Journal of Raman Spectroscopy, 40, 370 (2009).
T. Maiti, R. Guo, and A. S. Bhalla, "Structure-property phase diagram of BaZrxTi1-xO3 system,
" Journal of American Ceramic Society (Invited Paper) 91 [6], 1769 (2008).
T. Maiti, R. Guo and A. S. Bhalla, "Ferroelectric relaxor behavior in Ba(ZrxTi1-x) O3
:MgO Composites," Journal of Physics D: Applied Physics, 40, 4355 (2007).
T. Maiti, R. Guo and A. S. Bhalla, "Enhanced electric field tunable dielectric properties of BaZrx relaxor
ferroelectrics," Applied Physics Letters, 90, 182901 (2007).
T. Maiti, R. Guo and A. S. Bhalla, "Tailored dielectric properties and tunability of lead free relaxor
Ba(ZrxTi1-x)O3:MgO composites," Ferroelectrics, 361, 84 (2007).
(pdf)
T. Maiti, R. Guo and A. S. Bhalla, "Electric field dependent dielectric properties and high tunability of
BaZrxTi1-xO3 relaxor ferroelectrics," Appl. Physics Letters, 89, 122909 (2006).
T. Maiti, R. Guo and A. S. Bhalla, "The evolution of relaxor behavior in Ti4+ doped BaZrO3 Ceramics,
" Journal of Applied physics, 100, 114109 (2006).
T. Maiti, E. Alberta, R. Guo and A. S. Bhalla, "The polar cluster like behavior in Ti4+ substituted BaZrO3
Ceramics," Materials Letters, 60(29-30), 3861 (2006).
S. Ghosh, T. Maiti, S. Sen and S. Mukhopadhyay, "Influence of gel-derived nanocrystalline spinel in a high alumina castable,
" Ceramics International, 31(2), 333 (2005).
S. Mukhopadhyay, S. Sen, T. Maiti, M. Mukherjee, R. N. Nandy and B. K. Sinhamahapatra, "In situ spinel bonded refractory castable
in relation to co-precipitation and sol-gel derived spinel forming agents," Ceramics International, 29(8), 857 (2003).
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