固体-液体相転移におけるポリ(3-オクタデシルチオフェン)のキャリア輸送現象と電子状態

概要

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We have studied on carrier transport phenomena, especially the evaluation of the mobility and the nature of photocarrier, of regiorandom poly(3-octadecylthiophene), PAT 18 at solid-liquid phase transition by using a time-of-flight technique. With increasing temperature, the hole mobility gradually decreases and decreases sharply at solid-liquid phase transition. On the other hand, the negative carrier mobility can be evaluated in the range from 10^<-6> to 10^<-5> cm^2/Vs, which is comparably the hole mobility at solid state, above solid-liquid phase transition. Then the observed small hydrostatic pressure dependence of conductivity seems to support the interpretation of electronic transport even in liquid phase. Accordingly, the negative carrier is electron. These unique phenomena have been interpreted as modulation of electronic energy state based on conformational change of the PAT18 main chain.
兵庫県立大学の論文