全无机Cs2PbI2Cl2/CsPbI3-xBrx钙钛矿晶体生长动力学行为及其太阳电池研究

钙钛矿太阳电池因低廉的材料成本、简单的制备工艺和高的光电转换效率，在近年来获得了世界范围的广泛关注。全无机钙钛矿材料作为钙钛矿太阳电池光吸收层的最佳候选者之一，虽具有热稳定好和光伏半导体特性优异等优点，却在成膜过程中极易受到因晶体结构发育不完全而造成薄膜均一性差、薄膜内部缺陷较多和相稳定性差等问题的困扰。本项目旨在保证全无机钙钛矿材料相稳定性的同时，对全无机钙钛矿材料的晶体生长动力学和载流子传输机制进行深入研究和探讨。重点研究Cs2PbI2Cl2/CsPbI3-xBrx异质结构晶体生长过程中的动力学影响和二者竞争生长的理论机制，并探寻有效抑制薄膜中枝晶偏析的方法；从异质结构构建和晶体生长动力学角度对Cs2PbI2Cl2/CsPbI3-xBrx异质结构的载流子倍增现象进行综合分析，并提出全无机钙钛矿太阳电池光电转换效率提升策略。本项研究对全无机钙钛矿太阳电池的进一步商业化具有重要的意义。

Perovskite solar cells have gained worldwide attention in recent years due to their low material cost, simple preparation process and high photoelectric conversion efficiency. As one of the best candidates for the light absorption layer of perovskite solar cells, all-inorganic perovskite materials have the advantages of good thermal stability and excellent photovoltaic characteristics. However, all-inorganic perovskites are extremely vulnerable to the influence of crystal growth kinetics during the film formation process. This process may cause problems such as poor film uniformity, formation of internal defects within the film, and poor phase stability at room temperature. In this project, we will focus on the study of the dynamics of Cs2PbI2Cl2/CsPbI3-xBrx heterostructure crystal growth process and the theoretical mechanism of the competitive growth of heterostructures, and explore methods to effectively inhibit dendrite segregation within the films. The carrier multiplication phenomenon of Cs2PbI2Cl2/CsPbI3-xBrx heterostructure will be comprehensively analyzed from the perspective of heterostructure construction and crystal growth kinetics. Further, the strategies to improve the photoelectric conversion efficiency of all-inorganic perovskite solar cells will be proposed. The research is of great significance to the commercialization of all-inorganic perovskite solar cells.