The Photovoltage-gas Sensitive Properties of 7,7,8,8-Tetracyanoquinodimethane(TCNQ)

In this paper, surface photovoltage technique (SPV) was applied to the study of photovoltaic and gas sensitive properties of TCNQ polycrystal. It was found that SPV shows two peaks at 390 nm(P1) and 480 nm (P2) in the ultraviolet-visible range. And they are opposite in phase. The results of gaseous adsorption confirm that P, shows the acceptor characteristics, while PI shows that of donor. During adsorption, donor gas interacts with conjugated II * orbital, acceptor gas with the terminal group C=N .

7,7,8,8-四氰基对苯醌二甲烷的光伏-气敏特性

用表面光电压谱技术研究了7,7,8,8-四氰基对苯醌二甲烷多晶的光伏-气敏特性。结果表明,在较高真空度条件下,该化合物有两类不同的表面光电压响应峰,分别位于390 nm(P_1)和480 nm(P_2)。探针气体吸附证明,P_1表现出较强的受体性,而P_2则显示出给体性质。给体性分子与该化合物的∏键轨道作用,而受体分子与其C≡N端基作用。