硫化锑/铋纳米结构太阳电池的表界面结构调控和器件性能研究

项目名称： 硫化锑/铋纳米结构太阳电池的表界面结构调控和器件性能研究

项目编号： No.11274308

项目类型： 面上项目

立项/批准年度： 2013

项目学科： 数理科学和化学

项目作者： 叶长辉

作者单位： 中国科学院合肥物质科学研究院

项目金额： 90万元

中文摘要： 纳米结构太阳电池有望通过低成本制造实现较高光电转换效率。研究表明，影响纳米结构太阳电池光电转换效率的关键物理因素是载流子跨越纳米尺度界面过程中的束缚、复合以及反向隧穿问题。而以上过程严格受界面的缺陷结构和能带结构匹配程度所约束。纳米结构太阳电池及材料表界面结构非常复杂，缺乏纳米尺度表界面结构调控的物理原理和调控方法。本项目拟以硫化锑和硫化铋（重要的光伏材料：光吸收系数大、储量丰富、环境友好）纳米结构太阳电池为主要研究对象，系统研究纳米尺度表界面缺陷结构及缺陷钝化的物理机制和方法，分析表界面缺陷对载流子输运的影响，探索异质界面能级失配度对载流子输运及隧穿的影响规律，认识界面电偶极对能带结构及载流子定向输运作用，以获得具有较高开路电压、短路电流、填充因子的硫化锑、硫化铋纳米结构光伏器件。该项目的成功实施将为提高纳米结构太阳电池光电转换效率奠坚实基础，对丰富太阳能发电的综合利用具有深远意义。

中文关键词： 太阳电池；表界面结构；纳米结构；薄膜材料；结构调控

英文摘要： Nanostructured solar cells have the potential to realize relatively higher photon-to-electricity conversion efficiency through low-cost fabrication route. Research results indicate that the key physical issues limiting a higher efficiency are the trapping, recombination, and back-tunneling of charge carriers when tranversing the nanoscale interfaces.The above processes are critically dependent on the defect structures and energy band matching in the interface. The surface/interface structures of nanostructured solar cells and materials are rather complex, and it lacks physical principles and management approach to nanoscale surface/interface structure manipulation.In this project, we will focus on nanostructured solar cells of antimony sulfide and bismuth sulfide that have large optical absorption coefficients and are of abundance on the earth and environment friendly, systematically investigate the physical mechanisms and methods for nanoscale surface/interface defect structure and defect passivation, analyze the impact of surface/interface defects on the transport of charge carriers,study the influence of conduction and valence band misfit in the hetero-interface on the transport and tunneling of charge carriers, and figure out the effect of electric dipole on the energy band structure and directed transport

英文关键词： solar cells；surface/interface structure；nanostructures；thin film materials；structure modulation