Investigation Of Photoresponsive Organic Field-effect Transistors Based On C60and Palladium Phthalocyanine

Photoresponsive organic field-effect transistors (PhotOFETs) have been widely investigated in recent years because of their potential application in light-induced switches, detection circuits and highly sensitive image sensors. PhotOFETs have clear advantages over photodiodes, including higher sensitivity and lower noise levels. They are a new addition to the organic field-effect transistor (OFET) family, and are a major focus in current organic electronic device research. The three-terminal optoelectronic device generates additional carriers (photocarriers) upon illumination. Palladium phthalocyanines (PdPc) are widely used as active materials in OSCs and OFETs. C60is an attractive n-type active material exhibiting a high electron mobility of4.9cm2/Vs. Highly efficient OSCs based on PdPc/C60active layers have been reported. Similarly, PhotOFETs based on PdPc/C60planar heterojunctions are expected to exhibit high photosensitivity and photoresponsivity.This article is mainly to do the work as follows:1) Research the OFETs based on C60with different electrodes, and the results showed that the device with Al as electrode exhibited higher on/off and higher electron mobility than the device with Au as electrode.2) The photoresponsive characteristics both of single PdPc component PhotOFET and PdPc/C60heterojunction PhotOFET were investigated And the results showed the heterojunction PhotOFET had better photoresponsive performance.3) Research the influence on the deposition of layer sequence of PdPc and C60. At the same time, the repeatability and reliability of the heterojunction devices were considered as well. The results showed that the PhotOFET with C60as channel material obtained superior performance to the PhotOFET with PdPc as channel material, but the PdPc/C60-PhotOFET showed better stability.