Copyright © All rights reserved. Made by VBC.
Professor,
Materials Science and Engineering,
Indian Institute of Technology-Kanpur ,
Work Phone: (512) 2597353,
Email: saboo[at]iitk.ac.in
Materials Science and Engineering,
Indian Institute of Technology-
Email: saboo[at]iitk.ac.in
Dipti Gupta’s Thesis
Thesis Topic
Effect of pentacene thickness in organic thin film transistors: measurements and simulations in top and bottom contact devices
Effect of pentacene thickness in organic thin film transistors: measurements and simulations in top and bottom contact devices
Although, OTFT technology has made significant progress in the recent past in achieving high mobilities, it still faces a number of challenges at the fabrication, materials and device physics level. These include limited understanding of the effect of organic semiconductor structure on carrier mobility, charge injection from metal, and charge transport at the dielectric/semiconductor interface. In this thesis, a concentrated effort is made to analyze the effect of each of these issues separately on the device performance through experiments, analytical models and numerical simulations.
Our methodology is to numerically simulate the experimentally obtained OTFT device characteristics: (i) to estimate bulk and interface trap types and concentrations in the organic semiconductor; (ii) to highlight the effect of contacts through two different design of OTFTs i.e. top (metal is deposited above the organic semiconductor) and bottom (metal is deposited prior to the organic semiconductor) contact OTFTs; and (iii) to investigate the effect of dielectric/semiconductor interface structure on device characteristics for different semiconductor thicknesses. We used pentacene as the organic semiconductor, which has demonstrated consistent high mobility in OTFT devices. Numerical simulations are done on a commercially available software ATLAS (Silvaco), originally developed for inorganic semiconductors.
Our methodology is to numerically simulate the experimentally obtained OTFT device characteristics: (i) to estimate bulk and interface trap types and concentrations in the organic semiconductor; (ii) to highlight the effect of contacts through two different design of OTFTs i.e. top (metal is deposited above the organic semiconductor) and bottom (metal is deposited prior to the organic semiconductor) contact OTFTs; and (iii) to investigate the effect of dielectric/semiconductor interface structure on device characteristics for different semiconductor thicknesses. We used pentacene as the organic semiconductor, which has demonstrated consistent high mobility in OTFT devices. Numerical simulations are done on a commercially available software ATLAS (Silvaco), originally developed for inorganic semiconductors.