期刊
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
卷 95, 期 1, 页码 291-296出版社
SPRINGER HEIDELBERG
DOI: 10.1007/s00339-008-5026-9
关键词
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资金
- US Department of Energy [DE-FG02-05ER46252]
- National Science Foundation MRSEC Program [DMR 0212302]
Electrolytes are finding applications as dielectric materials in low-voltage organic thin-film transistors (OTFT). The presence of mobile ions in these materials (polymer electrolytes or ion gels) gives rise to very high capacitance (> 10 mu F/cm(2)) and thus low transistor turn-on voltage. In order to establish fundamental limits in switching speeds of electrolyte gated OFETs, we carry out in situ optical spectroscopy measurement of a poly(3-hexylthiophene) (P3HT) OTFT gated with a LiClO4:poly(ethyleneoxide) (PEO) dielectric. Based on spectroscopic signatures of molecular vibrations and polaron transitions, we quantitatively determine charge carrier concentration and diffusion constants. We find two distinctively different regions: at V (G)a parts per thousand yena'1.5 V, drift-diffusion (parallel to the semiconductor/dielectric interface) of hole-polarons in P3HT controls charging of the device; at V (G)<-1.5 V, electrochemical doping of the entire P3HT film occurs and charging is controlled by drift/diffusion (perpendicular to the interface) of ClO4 (-) counter ions into the polymer semiconductor.
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