化学
电荷(物理)
咔唑
瞬态(计算机编程)
光化学
液晶
光诱导电荷分离
盘状液晶
接受者
超快激光光谱学
电荷转移复合物
载流子
激发态
结晶学
作者
K. J. Donovan,K. Scott,M. Somerton,Jon A. Preece,M. Manickam
标识
DOI:10.1016/j.chemphys.2005.09.036
摘要
We describe transient photoconduction studies on a well known triphenylene discotic liquid crystal molecule modified to incorporate a single carbazole moiety on one side chain and doped with the acceptor, trinitrofluorenone. This material is found to show both electron and hole photocurrents when the transient photoconduction study is carried out in the time of flight geometry although no time of flight transits are observed. Of interest here is the fact that the temperature dependence of the hole and electron photocurrents are radically different, the electron photocurrent being strongly activated while the hole photocurrent decreases with increasing temperature. We suggest a mechanism whereby the electron photocurrent controls the hole photocurrent through recombination. Furthermore, the electron activation energy varies with the applied electric field, indicating the influence of the Poole Frenkel barrier lowering mechanism in the production of the charge carriers.
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