Zhao Hang, Liu Xiaolong, Xu Jia, Li Zhenzhen, Fu Yao, Zhu Honglu, Yan Luxin, Liu Zhike, Liu Shengzhong Frank, Yao Jianxi
State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University, Beijing 102206, China.
Beijing Key Laboratory of Energy Safety and Clean Utilization, North China Electric Power University, Beijing 102206, China.
ACS Appl Mater Interfaces. 2020 Oct 28;12(43):48756-48764. doi: 10.1021/acsami.0c11994. Epub 2020 Oct 19.
The optoelectronic properties of all-inorganic perovskite solar cells are greatly affected by the quality characteristics of films, such as the defect concentration, crystal growth orientation, crystallinity, and morphology. In this study, a PbI-(DMSO) complex is adopted to partially replace PbI as the lead source in the preparation of perovskite precursor solutions. Due to the rapid dispersion of the PbI-(DMSO) complex in a solvent, raw materials can rapidly react to form perovskite colloids with a narrow size distribution. Such uniform colloidal particles are found to be beneficial for achieving films with improved quality and highly orientated growth along the [001] direction. The optimized film exhibits a clearly improved crystallinity and a decrease in defect concentration from 4.29 × 10 cm to 3.20 × 10 cm. The device based on the obtained all-inorganic CsPbIBr perovskite finally achieves an increase in photovoltaic power conversion efficiency from 10.5 to 14.15%. In addition, the environmental stability of the device also benefits from the improved film quality. After 480 h of storage in air, the device can still maintain nearly 80% of its initial performance.
全无机钙钛矿太阳能电池的光电性能受到薄膜质量特性的极大影响，如缺陷浓度、晶体生长取向、结晶度和形貌。在本研究中，采用PbI-(DMSO)络合物部分替代PbI作为制备钙钛矿前驱体溶液的铅源。由于PbI-(DMSO)络合物在溶剂中快速分散，原料能迅速反应形成尺寸分布窄的钙钛矿胶体。发现这种均匀的胶体颗粒有利于获得质量提高且沿[001]方向高度取向生长的薄膜。优化后的薄膜结晶度明显提高，缺陷浓度从4.29×10 cm降至3.20×10 cm。基于所得全无机CsPbIBr钙钛矿的器件最终实现了光电功率转换效率从10.5%提高到14.15%。此外，器件的环境稳定性也得益于薄膜质量的提高。在空气中储存480小时后，器件仍能保持其初始性能的近80%。
