DETERMINATION OF FIELD-EFFECT MOBILITY OF POLY(3-HEXYLTHIOPHENE) UPON EXPOSURE TO NH3 GAS

被引:74
作者
ASSADI, A
GUSTAFSSON, G
WILLANDER, M
SVENSSON, C
INGANAS, O
机构
[1] University of Linköping, Department of Physics and Measurement Technology
关键词
Ammonia; -; Transistors; Field Effect--Applications;
D O I
10.1016/0379-6779(90)90135-8
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
A field-effect transistor (FET) has been used to study the transport properties of poly(3-hexylthiophene) (P3HT). It has been observed that the performance of the device strongly depends on polymer thickness. The I-V characteristics of the polymer transistor are very similar to those of the same inorganic device, if we use a polymer thickness in the range 700-1000 Å. The transistor has been employed to study changes in mobility and conductivity of the polymer exposed to air or kept in a vacuum for investigation of the ageing process in P3HT. It was observed that mobility and conductivity decrease more rapidly on the sample stored in air than on that stored in a vacuum. We have found that mobility and conductivity decrease upon exposure to NH3 gas. Most of the changes are reversible, and the longer the film stays in the ammonia, the less reversible are the changes. For a short period of time (15-20 min) the effect is 100% reversible. Through our field-effect measurements we can interpret the conductivity decrease as a decrease of the mobility by two orders of magnitude. Therefore we conclude that no further undoping of the formally neutral polymer is obtained on exposure to ammonia. Based on these examples, we believe that FET structures offer unique opportunities to reveal the mechanisms of charge transport in conductive polymers. © 1990.
引用
收藏
页码:123 / 130
页数:8
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