MEH-PPV/CdSe纳米复合器件的光电导特性的研究  

Investigation on the Photoconductive Properties of MEH-PPV/CdSe Nanocomposite Devices

作　　者：唐爱伟[1] 滕枫[1] 高银浩[1] 靳辉[1] 梁春军[1] 徐征[1] 王永生[1] 

机构地区：[1]北京交通大学光电子技术研究所发光与光信息技术教育部重点实验室,北京100044

出　　处：《光谱学与光谱分析》2006年第12期2169-2172,共4页Spectroscopy and Spectral Analysis

基　　金：国家重点基础研究发展计划项目(2003CB314707);国家自然科学基金项目(90301004;10434030;60406005);北京市科技新星计划项目(2004B10)资助

摘　　要：以CdO和Se粉作为前驱物,在TOPO/TOP有机体系中制备了CdSe纳米晶,将其与聚合物MEH-PPV复合制备了复合光电导器件,研究了它的光电导特性,并将其与单层MEH-PPV光电导器件的特性进行了比较。结果发现纳米复合光电导器件的光电流响应光谱的2个峰的位置基本上与MEH-PPV和CdSe纳米晶的吸收峰的位置相对应,这说明CdSe纳米晶和聚合物MEH-PPV的吸收对光电流都有贡献,主要是由于CdSe纳米晶和MEH-PPV界面处的激子离化和电荷转移造成的。而且复合器件的光电流较单层有所增强,且MEH-PPV器件光谱的响应范围更宽。Photoconductive properties of the composite devices made up of cadmium selenide nanocrystals and polymer poly[-2- methoxy-5-（2＇-ethylhexyloxy-p-phenylenevinylene）] （MEH-PPV） were investigated. The photocurrent action spectrum for a nanocomposite device corresponded to the absorption of MEH-PPV and CdSe nanocrystals, indicating that the absorption of the CdSe nanocrystals and MEH-PPV contributed to the photocurrent. The photocurrent was attributed to the exciton dissociation and charge transfer between the interface of CdSe nanocrystals and MEH-PPV. The photocurrent action spectra of the nanocom- posite device was wider than that of the pure MEH-PPV device, and the photocurrent was enhanced in comparison with the pure MEH-PPV device due to the introduction of CASe nanocrystals.

关 键 词：光电导 MEH—PPV/CdSe 纳米复合器件 

分 类 号：TN383.1[电子电信—物理电子学]