构筑高效低成本的新型纳米结构太阳能电池，揭示器件内部界面微结构与最终光伏性能之间的关系，是未来光伏产业发展的理论和技术基础。本项目拟通过室温湿化学法原位制备化学稳定性高、光吸收系数大的Ⅰ-Ⅵ族（Ag2S、Cu2S、Ag3CuS2、Cu7.2S2Se2等）纳米晶阵列薄膜，并将其与共轭有机分子复合构建本体异质结薄膜太阳能电池，旨在从ITO/Ag2S:P3HT/Au器件的室温缓慢干燥处理着手，深入研究电池内部界面微结构变化与光吸收、激子扩散及解离、载流子传输等过程的关系，探讨界面微结构变化对电池器件开路电压、短路电流、填充因子以及光电转换效率的影响，以期获得最佳光伏性能器件的界面微结构参数。我们将以此为指导来设计和制备各种基于Ⅰ-Ⅵ族纳米晶的微观有序本体异质结薄膜太阳能电池，通过对器件内部界面微结构的调控及优化，进一步提高此类新型低能耗、低成本电池器件的光电转换效率。

Constructing low-lost, highly efficient solar cells with novel nanostructures, and finding out the relationship between interfacial microstructure in the devices and their photovoltaic properties set the theoretical and technological stage for prospective photovoltaic industrial development. This proposal is to fabricate Ⅰ-Ⅵ group (Ag2S, Cu2S, Ag3CuS2, Cu7.2S2Se2 etc.) nanocrystalline arrays which present high chemical stability and light-absorbing coefficient by an in-situ wet chemical method at room temperature, and construct bulk heterojunction (BHJ) solar cells by infiltrating conjugated organic molecules into the nanocrystalline arrays. Based on a room temperature slow drying process for device with ITO/Ag2S:P3HT/Au structure, we aim to deeply investigate the relationship between the changes of interfacial microstructure and the optical absorption, exciton diffusion and dissociation, carrier transmission, but also demonstrate the influence of changes of interfacial microstructure on open-circuit voltage, short-circuit current, fill factor and power conversion efficiency of photovoltaic devices and obtain optimal microstructure parameters of the best device, which would guide the following design and fabrication of various BHJ solar cells containing I-VI group nanocrystals with ordered microstructures. Finally, through the regulation and optimization of the interfacial microstructures, we will further improve the conversion efficiency of such novel photovoltaic devices with low cost and low energy consumption.