铜锌锡硫硒薄膜的主相/次生相调控与光电性能研究

铜锌锡硫硒（CZTSSe）薄膜太阳能电池较高的开路电压损耗是限制器件性能提升的最大难题之一。本项目旨在从CZTSSe复杂体系相调控着眼，揭示主相/次生相的生长与相结构（组成、比例、空间分布等）及能带结构的关系；探索基于环境友好溶剂、“金属簇”前驱体及低温元素直接反应的CZTSSe相调控新方法，实现次生相的精准调控；采用瞬态表面光电压谱（TSPV）/激光拉曼谱（Raman）联用的实时原位检测技术，阐明相结构对CZTSSe薄膜光生载流子的分离、传输和复合行为的影响。最终通过吸收层薄膜相调控显著提高器件开路电压，实现光电转换效率的新突破，为开发下一代高性能CZTSSe薄膜太阳能电池材料与器件提供新途径。

The high open-circuit voltage (Voc) loss of copper-zinc-tin-sulfur-selenium (CZTSSe) thin-film solar cells is the biggest problem that limits the device performance. This project aims to reveal the relationship between the growth of the main phase/secondary phase, the phase structure (composition, proportion, spatial distribution, etc.) and band structure of the CZTSSe complex system. We will explore new routes based on the environmentally friendly solvents, “metal cluster” precursors, and direct elemental reaction at low temperature to achieve precise regulation of secondary phases. The real-time in-situ detection technique using transient surface photovoltage / confocal Raman spectroscopy will be used to clarify the effect of phase structure on the carrier separation, transport and recombination behavior of CZTSSe thin film. Through the phase regulation of absorbing layer thin film, the Voc of the device will be significantly improved, so that a breakthrough in photoelectric conversion efficiency could be realized, which provides a new way for developing the next generation high performance CZTSSe thin film solar cell devices.