Regensburg 2007 – scientific programme

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SYOE: Symposium Organic Thin Film Electronics: From Molecular Contacts to Devices

SYOE 4: Organic Transistors

SYOE 4.1: Invited Talk

Tuesday, March 27, 2007, 09:30–10:15, H1

Vapor and Solution Deposited Small Molecule Organic Thin Film Transistors — •Thomas Jackson — Center for Thin Film Devices and Materials Research Institute, Department of Electrical Engineering, Penn State University, University Park, PA, USA, 16802

Organic thin film transistor (OTFT) device performance rivals or exceeds that of a-Si:H devices, and low OTFT processing temperature allows fabrication on a variety of surfaces including cloth, paper, or polymeric substrates. For device and system use, OTFTs must demonstrate the uniformity, reproducibility, reliability, and integration with other devices needed for practical applications. As an application demonstration we have integrated vapor-deposited OTFTs with organic light emitting diodes (OLEDs) and have fabricated small test displays on polyester substrates to investigate device characteristics and passivation and isolation requirements.

Many organic device applications are likely to be cost sensitive and solution-deposited organic semiconductors offer important advantages for low-cost processing. However, solution processed semiconductors typically lack the molecular-level order which may be necessary for good carrier transport and large field-effect transistor mobility. Working with J. Anthony (University of Kentucky) we have investigated functionalized pentacenes and pentacene derivatives. Surprisingly, solution-deposited films of some of these materials show good molecular ordering and, using these materials, we have fabricated simple circuits, including ring oscillators, and OTFTs with mobility > 2 cm^2/V-s.