Synthetic Metals ( IF 4.4 ) Pub Date : 2021-09-23 , DOI: 10.1016/j.synthmet.2021.116915 A.B. de Paiva 1 , G.I. Correr 1 , J.C. Ugucioni 2 , G.R. Carvalho 3 , R.G. Jasinevicius 4 , M.P.F. de Godoy 1
Deep and shallow traps play a fundamental role in the photoresponse profile of organic devices. Here we present an investigation on emeraldine-salt polyaniline films concerning structural, optical, and electrical properties by X-rays diffraction, optical and electron microscopies, and optical spectroscopies as Fourier Transform Infrared Spectroscopy (FTIR), absorption, and photoluminescence (PL). Photoconductivity measurements show signatures related to localized states near-edge absorption and the efficient transition between polaron bands. The photoconductive profile is dependent on the excitation intensity and presents negative photoconductivity (NPC) for higher intensities. A rate equations model attributes the NPC to shallow traps while the increase of response and recovery times are associated with deep traps.
中文翻译:
翡翠盐聚苯胺薄膜的光电导行为
深浅陷阱在有机器件的光响应曲线中起着重要作用。在这里,我们通过 X 射线衍射、光学和电子显微镜以及作为傅里叶变换红外光谱 (FTIR)、吸收和光致发光 (PL) 的光学光谱对翡翠-盐聚苯胺薄膜的结构、光学和电学特性进行了研究。光电导率测量显示与局部状态近边缘吸收和极化子带之间的有效跃迁相关的特征。光电导分布取决于激发强度,并在较高强度下呈现负光电导 (NPC)。速率方程模型将 NPC 归因于浅陷阱,而响应和恢复时间的增加与深陷阱相关。