Impact of semiconductor/metal interfaces on contact resistance and operating speed of organic thin film transistors
| Autor: | Wudyalew Wondmagegn, S. Gowrisanker, H. J. Stiegler, Husam N. Alshareef, Manuel Quevedo-Lopez, Ronald J. Pieper, Nikhil Satyala, Bruce E. Gnade |
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| Rok vydání: | 2010 |
| Předmět: |
Materials science
business.industry Contact resistance Transistor Atomic and Molecular Physics and Optics Electronic Optical and Magnetic Materials law.invention Switching time Pentacene Dipole chemistry.chemical_compound Semiconductor chemistry law Thin-film transistor Modeling and Simulation Optoelectronics Field-effect transistor Electrical and Electronic Engineering business |
| Zdroj: | Journal of Computational Electronics. 10:144-153 |
| ISSN: | 1572-8137 1569-8025 |
| DOI: | 10.1007/s10825-010-0311-1 |
| Popis: | The contact resistance of field effect transistors based on pentacene and parylene has been investigated by experimental and numerical analysis. The device simulation was performed using finite element two-dimensional drift-diffusion simulation taking into account field-dependent mobility, interface/bulk trap states and fixed charge density at the organic/insulator interface. The width-normalized contact resistance extracted from simulation which included an interface dipole layer between the gold source/drain electrodes and pentacene was 91 k?cm. However, contact resistance extracted from the simulation, without consideration of interface dipole was 52.4 k?cm, which is about half of the experimentally extracted 108 k?cm. This indicates that interface dipoles are critical effects which degrade performances of organic field effect transistors by increasing the contact resistance. Using numerical calculations and circuit simulations, we have predicted a 1 MHz switching frequency for a 1 μm channel length transistor without dipole interface between gold and pentacene. The transistor with dipole interface is predicted, via the same methods, to exhibit an operating frequency of less than 0.5 MHz. |
| Databáze: | OpenAIRE |
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