量子点的后修饰及其光伏特性的研究

项目名称： 量子点的后修饰及其光伏特性的研究

项目编号： No.51273104

项目类型： 面上项目

立项/批准年度： 2013

项目学科： 一般工业技术

项目作者： 王立铎

作者单位： 清华大学

项目金额： 85万元

中文摘要： 本项目针对量子点敏化太阳能电池（QDSSC）中量子点缺陷密度高和电解质对量子点的腐蚀等若干关键科学问题，拟系统研究QDSSC电池器件中非原位合成的量子点在纳米多孔光阳极吸附后的无机配体的界面修饰（量子点的后修饰）及量子点/电解质体系的腐蚀和匹配问题等，重点开展QDSSC电池器件中PbS量子点的I（Cl或Br等）原子配体的后修饰和量子点/碘电解质界面结构及其光伏特性的研究，研究量子点无机配体后修饰对降低缺陷和抑制电解质腐蚀的影响及其机理，研究其对电荷的分离和电子正向注入及传输、电子淬灭及电子反向复合等界面电子过程的作用机制并建立相关的理论模型等。在此基础上开展量子点的吸附/量子点的双体系后修饰多次复合处理与复合敏化结构的研究，通过量子点的后修饰降低量子点中的缺陷和抑制电解质的腐蚀，通过量子点的双体系修饰和复合敏化结构来拓宽光谱吸收范围增强光吸收，制备高效稳定的QDSSC电池器件。

中文关键词： 量子点；界面修饰；化学稳定性；窄带隙吸光材料；钙钛矿太阳能电池

英文摘要： This project is aimed at several key scientific issues in quantum dots sensitized solar cells (QDSSC), such as the high defect density inside quantum dots (QDs) and the rapid corrosion of the QDs caused by electrolyte. Interface modification of the inorganic ligand after non-site synthesized QDs absorbed by nanoporous photoanode, along with the corrosion and mismatch problems in QDs / electrolyte system will be systematically studied. Main research will focus on the post-modification of I (Cl or Br and so on) atom ligand for PbS QDs in QDSSC, as well as the interface structure and photovoltaic properties of QDs / iodine electrolyte interface. The effect and mechanism of the defects reduction and suppression of electrolyte corrosion by QDs inorganic ligand post-modification will be studied. And a theoretical model will be established by study the acting mechanisms of this post-modification on interfacial electron process, including charge separation, electron injection and transportation, electron quenching and charge recombination. On this basis, a study on QDs absorption / QDs post-modification alternating multi-treatment and structure of co-sensitization will be carried out. By using QDs post-modification to reduce QDs defects and inhibit the corrosion of electrolyte, and in the meantime using multi-treatment

英文关键词： Quautum dots；interface modification；chemical stability；narrow-bandgap absorber materials；perovskite solar cells