Liu Pengyun, Chen Yonghui, Xiang Huimin, Yang Xiaoqing, Wang Wei, Ran Ran, Zhou Wei, Shao Zongping
WA School of Mines: Minerals, Energy and Chemical Engineering (WASM-MECE), Curtin University, Perth, WA, 6845, Australia.
State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemical Engineering, Nanjing Tech University, Nanjing, 210009, China.
Small. 2021 Nov;17(46):e2102186. doi: 10.1002/smll.202102186. Epub 2021 Oct 5.
Both the film quality and the electronic properties of halide perovskites have significant influences on the photovoltaic performance of perovskite solar cells (PSCs) because both of them are closely related to the charge carrier transportation, separation, and recombination processes in PSCs. In this work, an additive engineering strategy using antimony acetate (Sb(Ac) ) is employed to enhance the photovoltaic performance of methylammonium lead iodide (MAPbI )-based PSCs by improving the film quality and optimizing the photoelectronic properties of halide perovskites. It is found that Ac and Sb of Sb(Ac) play different roles and their synergistic effect contributed to the eventual excellent photovoltaic performance of MAPbI -based PSCs with a power conversion efficiency of above 21%. The Ac anions act as a crystal growth controller and are more involved in the improvement of perovskite film morphology. By comparison, Sb cations are more involved in the optimization of the electronic structure of perovskites to tailor the energy levels of the perovskite film. Furthermore, with the assistance of Sb(Ac) , MAPbI -based PSCs deliver much improved moisture, air, and thermal stability. This work can provide scientific insights on the additive engineering for improving the efficiency and long-term stability of MAPbI -based PSCs, facilitating the further development of perovskite-based optoelectronics.
卤化物钙钛矿的薄膜质量和电子性质对钙钛矿太阳能电池（PSCs）的光伏性能都有显著影响，因为它们都与PSCs中的电荷载流子传输、分离和复合过程密切相关。在这项工作中，采用了一种使用醋酸锑（Sb(Ac) ）的添加剂工程策略，通过改善薄膜质量和优化卤化物钙钛矿的光电性质来提高基于碘化甲脒铅（MAPbI ）的PSCs的光伏性能。研究发现，Sb(Ac) 中的Ac和Sb发挥着不同的作用，它们的协同效应促成了基于MAPbI 的PSCs最终具有超过21%的功率转换效率的优异光伏性能。Ac阴离子充当晶体生长控制器，更多地参与到钙钛矿薄膜形貌的改善中。相比之下，Sb阳离子更多地参与到钙钛矿电子结构的优化中，以调整钙钛矿薄膜能级。此外，在Sb(Ac) 的辅助下，基于MAPbI 的PSCs在湿度、空气和热稳定性方面有了很大改善。这项工作可为改善基于MAPbI 的PSCs的效率和长期稳定性的添加剂工程提供科学见解，促进基于钙钛矿的光电器件的进一步发展。
