基于全无机/有机无机杂化钙钛矿的高性能两端叠层太阳能电池研究

昂贵的成本是制约传统高效率叠层光伏技术广泛应用的瓶颈。近年来，可溶液法制备的有机无机杂化钙钛矿叠层太阳能电池由于高效率和低成本特性成为研究热点。针对有机无机杂化钙钛矿叠层电池中顶电池的易挥发有机阳离子以及混合卤素导致的稳定性和开压损失等共性科学问题，本项目拟探索以全无机CsPbI3替代杂化混合卤素钙钛矿构筑高效稳定的两端叠层电池器件。由于CsPbI3具备无有机阳离子、单一卤素的特点，因此具备材料本征特性上的组分稳定性和光稳定性。通过结合子电池电流匹配原理和全器件光场仿真的方法对电池的光吸收层、缓冲层和复合层材料的带隙设计、厚度等关键器件参数进行理论指导，并通过实验验证辅助优化器件性能。探索结晶动力学调控和疏水钝化协同机制攻克CsPbI3光活性相稳定性问题以及CsxFA1-xPbySn1-yI3窄带隙厚膜的薄膜质量问题，最终发展出高效稳定的无机/杂化钙钛矿叠层太阳能电池技术。

The high cost is the bottleneck that restricts the wide application of traditional high efficiency tandem photovoltaic technology. In recent years, solution-processable organic-inorganic hybrid perovskite tandem solar cells have become a research hotspot due to their high efficiency and low cost. Aiming at the common scientific problems of stability issue ascribed to volatile organic cations in the top cell and open-voltage loss caused by mixed halogen, this project intends to explore the use of all inorganic CsPbI3 instead of hybrid mixed halide perovskite to fabricate high-efficiency and stable two-terminal tandem solar cells. Due to free of organic cation and pure halogen, CsPbI3 features intrinsically component stability and photostability. By combining the principle of sub-cell current matching and the method of full-device light field simulation, the bandgap design, thickness and other key device parameters of the optical absorption layer, buffer layer and recombination layer materials of the tandem device are theoretically guided, and the device performance is further demonstrated and optimized by experimental verification. By exploring the crystallization kinetics regulation and hydrophobic-passivation synergistic mechanism, it is intended to realize stable CsPbI3 and the high-quality narrow-band-gap CsxFA1-xPbySn1-yI3 thick film. As a result, we are able to develop efficient and stable inorganic/hybrid perovskite tandem solar cell technology.