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Organic semiconductors offer an exciting low-cost alternative for large area applications. There has been considerable recent activity in the study of organic/polymer light emitting diodes (OLEDs) and thin film transistors (OTFTs). I am interested in modeling device and process aspects for OTFTs with particular focus on understanding fundamental transport mechanisms in these materials and exploring the impact of process conditions on device properties and performance. Current projects in this area include:

Improving Device Reliability and Stability: (Kareem Shoukri) OTFTs exhibit systematic drift in their electronic properties over the short term, and suffer from long-term device degradation mechanisms. This project involves (1) the characterization of device stability & reliability as a function of time and temperature; (2) understanding the impact of substrate morphology on device performance; and (3) experimenting with device passivation to improve mobility and reliability.

Transport Modeling: Device models for OTFTs generally fit their characteristics to the IV-characteristics of conventional (inorganic) MOSFETs. While this serves its purpose in providing common measures of device performance (mobility, threshold voltage, etc.) it is known to be unrepresentative of the physical phenomena in these devices. Our work in this area focuses on experiments and modeling to investigate the transport mechanisms in OTFTs and appropriate IV-characteristics incorporating these mechanisms.

This page was last updated on March 02, 2005