酞菁氧钛/卟啉氧钒复合体系光导性能的协同增强效应

Synergetic Enhancement of Photoconductive Property in TiOPc/VOTPP Composite

在酞菁氧钛 (Ti OPc) /卟啉氧钒 (VOTPP)复合光生材料中发现了光敏性的非线性增强现象 ,对复合体系的电子跃迁光谱和 X射线衍射图的研究结果表明 ,在基态下两种材料之间没有明显相互作用 ,光致放电研究说明 ,该现象来自光激发状态下复合体系中的隙间态跃迁对光导的贡献 ,XPS测试结果表明酞菁氧钛与卟啉氧钒分子之间存在着定向的部分电荷转移 ,光致激发状态下的电荷转移是协同增强效应的起因 .

Nonlinear enhancement of photosensitivity were observed in organic photoreceptors based on TiOPc/VOTPP composite. Absorption spectra revealed no evidences of interactions between the electronic states of TiOPc and VOTPP under ground state, X\|ray diffraction analyses didnt show the changes in their condensed states in composite photoreceptors. Photoinduced discharge experiment indicated that the nonlinear effect was ascribed to the contribution of photogenerated carriers resulted from the excitation of gap states, which were intensified by the composing of hetero\|molecules. The data obtained from XPS measurement on composite materials suggested that there existed a fractional charge transition from TiOPc to VOTPP molecules, such photoinduced charge transfer between the two components was another factor related to the nonlinear effect. This synergetic enhancement effect provide a strategy for designation of novel photoconductive materials and devices driven in a low field based on weak electron donor/weak electron acceptor composites.