酞菁/富勒烯异质结可见光有机光探测器

Visible Organic Photodetectors Based on an HPc/C Planar Heterojunction

采用酞菁(H_(2)Pc)作为给体材料,富勒烯(C_(60))作为受体材料,构筑了基于H_(2)Pc/C_(60)平面异质结的有机光探测器.同时采用碘化亚铜(CuI)作为阳极缓冲层,通过优化CuI和H_(2)Pc的厚度可获得高性能的器件.器件的光电响应可覆盖整个可见光区域,器件响应来源于H_(2)Pc和C_(60)的共同吸收,表明H_(2)Pc和C_(60)的光生激子在H_(2)Pc/C_(60)界面处发生了高效解离.当CuI的厚度为2 nm、H_(2)Pc的厚度为60 nm时,器件在600 nm处的外量子效率达到26.1%,且零偏压下的响应度为105.3 mA/W,探测率为1.50×10^(12) Jones.

Organic photodetectors with a metal-free phthalocyanine(H_(2)Pc)/fullerene(C_(60)) planar heterojunction were fabricated, where H_(2)Pc and C_(60) were used as the donor and acceptor, respectively. A CuI layer was used as the anode buffer layer for the photodetectors. The device structure can be optimized by tuning the thicknesses of the CuI and H_(2)Pc layers. The photodetectors showed a broad response covered the whole visible light region, which was attributed to the simultaneous absorptions of H_(2)Pc and C_(60). This suggests that the photogenerate dexcitons both in H_(2)Pc and C_(60) are efficiently dissociated at the H_(2)Pc/C_(60) interface. The optimized device with CuI and H_(2)Pc thicknesses of 2 and 60 nm, respectively, exhibits an external quantum efficiency of 26.1% at 600 nm. Besides, it also presents a response of 105.3 mA/W and a detectivity of 1.50×10^(12) Jones.