Electrically active organic and polymeric materials for thin-film-transistor technologies
- PDF / 534,233 Bytes
- 12 Pages / 612 x 792 pts (letter) Page_size
- 14 Downloads / 200 Views
MATERIALS RESEARCH
Welcome
Comments
Help
Electrically active organic and polymeric materials for thin-film-transistor technologies Andrew J. Lovinger and Lewis J. Rothberg Bell Laboratories, Lucent Technologies, Murray Hill, New Jersey 07974 (Received 23 October 1995; accepted 22 December 1995)
Organic and polymeric materzials have seen a tremendous growth in research in the last five years as potential electroactive elements in thin-film-transistor (TF T) applications. These are driven by the increasing interest in flat-panel-display applications, for which organic and polymeric materials offer strong promise in terms of properties, processability, cost, and compatibility with eventual lightweight, flexible plastic displays. In this review we summarize the current status of our knowledge on the science of these organic and polymeric semiconducting materials. Most of these are based on linear thiophenes, especially a-hexathienyl, which has elicited by far the most attention. Mobility values in the 1022 –1021 cm2yVs and especially source-drain current onyoff ratios of up to 106 make this a highly promising potential alternative to amorphous silicon. Other thienyl compounds are also discussed, as are polymeric analogues. A brief discussion of technological potential, limitations, and problems that need to be overcome is given at the end.
I. INTRODUCTION
Polymeric and organic materials have been traditionally viewed as electrically inactive and applied very extensively as dielectric layers and electrical insulators. However, this view has gradually been changing over the last two decades as electrically conducting, piezoelectric, pyroelectric, ferroelectric, nonlinear electrooptic, and light-emitting members of these material families have come into prominence. Perhaps the newest and one of the fastest-growing areas of research in electroactive organic and polymeric materials involves their semiconducting properties, with particular emphasis on thin-filmtransistor (TF T) applications. In fact, of the references in this review, over 60% date from 1990 or later. One reason for this intense research activity is related to the processability advantages that these materials could potentially offer compared to current silicon technology, which generally requires expensive, high-temperature, ultra-high-purity chemical-vapor-deposition techniques and batch processing onto small (6 –8 inch) wafers. In contrast, organics and polymers can generally be deposited by simple, inexpensive, low-temperature methods (such as coating, casting, or evaporation), which lend themselves to continuous processing. Coupled with their possibility for deposition onto large-area, flexible plastic substrates is the longer-term visionary potential for reel-to-reel manufacture of thin, lightweight, bendable television sets, flat-panel displays, and computers. J. Mater. Res., Vol. 11, No. 6, Jun 1996
http://journals.cambridge.org
Downloaded: 17 Mar 2015
There is a large number of early studies on semiconducting polymers and organics (see, e.g
Data Loading...
