AVS 45th International Symposium
    Organic Electronic Materials Topical Conference Monday Sessions
       Session OE+EM-MoA

Paper OE+EM-MoA5
Soluble and Processable Oligothiophenes and Analogues as Semiconductors for Thin Film Transistors

Monday, November 2, 1998, 3:20 pm, Room 327

Session: Organic Thin Film Devices II: Transitors and Transport
Presenter: W. Li, Bell Laboratories, Lucent Technologies
Authors: W. Li, Bell Laboratories, Lucent Technologies
H.E. Katz, Bell Laboratories, Lucent Technologies
A.J. Lovinger, Bell Laboratories, Lucent Technologies
K.R. Amundson, Bell Laboratories, Lucent Technologies
Correspondent: Click to Email
There has been rapid progress in the synthesis and fabrication of organic semiconductors for field effect transistors (FETs) useful for plastic-based electronics. Conjugated oligomers, such as oligothiophenes and their derivatives, have been shown to be effective semiconducting layers for FETs. We and others have utilized these compounds primarily as vapor-deposited solid films. Recently, our investigation has been extended to liquid phase fabrication of organic FETs. We have synthesized a series of soluble and processable oligothiophenes and related compounds. Thin film FETs cast from solutions of these compounds showed both high field-effect mobilities (ca. 0.03 cm@super 2@/Vs) and relatively high on/off current ratios (>10@super 3@). We find that the film continuity and field-effect mobility are strongly dependent on solvents and dielectric substrates used as well as other casting conditions. Detailed synthetic routes and transistor characteristics, as well as approaches to devices with higher on/off ratios will be presented.