Micro-organic single crystalline phototransistors of 7,7,8,8-tetracyanoquinodimethane and tetrathiafulvalene

Hui Jiang; Xianjin Yang; Zhenduo Cui; Yongchang Liu; Hongxiang Li; Wenping Hu
March 2009
Applied Physics Letters;3/23/2009, Vol. 94 Issue 12, p123308
Academic Journal
Classical p-type and n-type organic single crystals, tetrathiafulvalene (TTF) and 7,7,8,8-tetracyanoquinodimethane (TCNQ), are introduced to investigate photoswitch and phototransistor. High photoresponsivity, low persistent conductivity, and response reversibility can be found in single crystalline TCNQ, while TTF has large persistent conductivity when the light is switched on and off. It is probably attributed to different band gaps and the compactness of molecular packing. Single crystalline TCNQ combines light detection, switching, signal amplification in a single device and realization of multiple functions which exhibit a very promising potential for the fabrication of organic photoelectric devices.


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