有机/无机复合体异质结中电荷定域态的光谱特性研究

项目名称： 有机/无机复合体异质结中电荷定域态的光谱特性研究

项目编号： No.61205036

项目类型： 青年科学基金项目

立项/批准年度： 2013

项目学科： 信息四处

项目作者： 赵铌

作者单位： 香港中文大学深圳研究院

项目金额： 28万元

中文摘要： 有机/无机复合体异质结是一种极具应用前景的太阳能电池体系。然而，它现有的光电转化效率仍明显低于理论预期值。其原因在于复合体异质结体系中，给体/受体界面通过电荷转移产生的可移动载流子未能有效的逃逸界面、转化为可收集载流子。 因此,本项目以找出制约电荷分离、逃逸和收集过程的关键参数为目标，首次提出以电荷调制光谱（CMS）为主，辅以光诱导吸收光谱的方法来直接测量电荷在异质结界面定域化的程度。其特色在于以电诱导办法来有效解决光诱导测量中不同极性电荷之间的互扰问题。其中，单组分和异质结两种场效应晶体管同时用作CMS测试器件的设计方案，将使分别探测电子和空穴在界面和在单种材料内部的性质成为可能。以此为基础，项目将研究材料的形貌、分子的排列、极化率以及无机组分的表面态对太阳能电池内的电荷定域性的影响。本研究结果将对设计、制备新的有机/无机复合体异质结材料体系、进一步提高其太阳能电池的性能提供极大的帮助。

中文关键词： 有机无机复合半导体；有机金属卤化物钙钛矿；太阳能电池；光谱；

英文摘要： Hybrid organic-inorganic heterojunction is a promising material system for solar cell application. So far, such system exhibits much lower power conversion efficiencies as compared to the theoretically predicted value. This is due to the undesirable loss of free carriers during the charge separation and transport process, which follows the charge transfer at the heterojunction interface. The proposed project aims to identify the key parameters that limit the efficiency of charge separation and collection. We plan to use charge modulation spectroscopy (CMS), in combination with photoinduced absorption spectroscopy, to directly interrogate the degree of localization of charge carriers in hybrid heterojunction systems. By using the electric-field-induced approach, we will be able to study the electronic states of electrons and holes without the interference from their counter charges, which is inevitable in photoinduced measurements. We will develop single-component and hybrid heterojunction field-effect transistor structures as the CMS testing configurations, which will enable us to separately probe electrons and holes and to vary their locations from the bulk donor and acceptor phases to their interface. Based on this platform, we will investigate the impacts of film morphology, molecular packing, polarizability

英文关键词： hybrid organi-inorganic semiconductors；organometal halide perovskites；solar cells；spectroscopy；