界面SAMs膜修饰对量子点敏化ZnO太阳能电池电荷行为的影响

项目名称： 界面SAMs膜修饰对量子点敏化ZnO太阳能电池电荷行为的影响

项目编号： No.11204104

项目类型： 青年科学基金项目

立项/批准年度： 2013

项目学科： 物理学I

项目作者： 杨丽丽

作者单位： 吉林师范大学

项目金额： 26万元

中文摘要： 界面优化是量子点敏化太阳能电池（QDSSCs）效率上取得突破性进展的关键问题所在。本课题拟制作量子点（CdS、CdSe等）敏化ZnO纳米线（管）太阳能电池，选用适当的有机自组装单层膜（SAMs）修饰ZnO光阳极界面，从界面电荷行为的微观角度深入研究SAMs层对电池光伏特性的影响。主要内容包括：根据ZnO的表面态和电池能级结构设计和优化SAMs层，通过理论计算揭示SAMs层对ZnO功函数的调控机制；利用光电调制和光电瞬态等技术系统地研究SAMs层对微尺度载流子浓度、寿命、迁移率与扩散长度等电子特性的影响，揭示SAMs层影响电荷分离、输运和复合的动力学和热力学机制。其研究成果不但会为解决ZnO基QDSSCs电池界面这一关键问题提供后备解决方案，也为其他种类电池的SAMs材料设计和界面优化提供实验依据和理论指导。

中文关键词： 界面修饰；自组装分子层；表面缺陷；能级排布；功函数

英文摘要： Interface optimization is a critical problem for the breakthroughs in the conversion effeciency of quantum dots semiconductor-sensitized Solar Cells (QDSSCs). In this project, the quantum dots (CdS, CdSe) sensitized ZnO solar cells will be fabricated with introducing the proper self-assembled monolayers (SAMs) to modificate the interface of ZnO photoanode. The effects of SAMs on the optivaltic properties will be investigated from the microscopic view of charge behaviors. The detailed contents include two aspects. On one hand, according to the surface states of ZnO and the band alignment of QDSSCs, the SAMs moleculars will be designed and optimized and their effect machenism on the work function of ZnO will be revealed by the theoretical calculation. On the other hand, the effects of SAMs on the carrier behaviors, such as concentration, life time, mobility and diffussion length and so on, will be systematically investigated by the optical/electrical modulation and transient techniques, and then the kinetic and thermodynamic mechanisms of charge seperation, transfer and recombination will be finally revealed. The above prospective results will not only supply a back-up solution for the interface problems of ZnO based QDSSCs, but also provide the experimental and theoretical basis for the SAMs design and interface

英文关键词： interface modification；self-assembled monolayer；surface defects；band alignment；work function