Zhang Zeyang, Ba Yanshuang, Chen Dandan, Ma Junxiao, Zhu Weidong, Xi He, Chen Dazheng, Zhang Jincheng, Zhang Chunfu, Hao Yue
State Key Discipline Laboratory of Wide Band Gap Semiconductor Technology & Shaanxi Joint Key Laboratory of Graphene, School of Microelectronics, Xidian University, Xi'an, Shaanxi 710071, PR China.
College of Science, Xi'an Shiyou University, Xi'an, Shaanxi 710065, PR China.
iScience. 2021 Oct 28;24(11):103365. doi: 10.1016/j.isci.2021.103365. eCollection 2021 Nov 19.
A water-based spray-assisted growth strategy is proposed to prepare large-area all-inorganic perovskite films for perovskite solar cells (PSCs), which involves in spraying of cesium halide water solution onto spin-coating-deposited lead halide films, followed by thermal annealing. With CsPbBr as an example, we show that as-proposed growth strategy can enable the films with uniform surface, full coverage, pure phase, large grains, and high crystallinity, which primarily benefits from the controllable CsBr loading quantity, and the use of water as CsBr solvent makes the reaction between CsBr and PbBr immune to PbBr film microstructure. As a result, the small-area (0.09 cm) and large-area (1.00 cm) carbon-electrode CsPbBr PSCs yield the record-high efficiencies of 10.22% and 8.21%, respectively, coupled with excellent operational stability. We also illustrate that the water-based spray-assisted deposition strategy is suitable to prepare CsPbCl, CsPbIBr, and CsPbIBr films with outstanding efficiencies of 1.27%, 10.44%, and 13.30%, respectively, for carbon-electrode PSCs.
本文提出了一种基于水基喷雾辅助生长的策略，用于制备用于钙钛矿太阳能电池（PSC）的大面积全无机钙钛矿薄膜，该策略包括将卤化铯水溶液喷涂到旋涂沉积的卤化铅薄膜上，然后进行热退火。以CsPbBr为例，我们表明，所提出的生长策略能够使薄膜具有均匀的表面、全覆盖、纯相、大晶粒和高结晶度，这主要得益于可控的CsBr负载量，并且使用水作为CsBr溶剂使得CsBr与PbBr之间的反应不受PbBr薄膜微观结构的影响。结果，小面积（0.09 cm）和大面积（1.00 cm）的碳电极CsPbBr PSC分别产生了创纪录的10.22%和8.21%的高效率，同时具有出色的运行稳定性。我们还表明，水基喷雾辅助沉积策略适用于制备CsPbCl、CsPbIBr和CsPbIBr薄膜，对于碳电极PSC，其效率分别高达1.27%、10.44%和13.30%。
