Duan, LinruiZhang, HongEickemeyer, Felix T.Gao, JingZakeeruddin, Shaik M.Gratzel, MichaelLuo, Jingshan2023-05-082023-05-082023-05-082023-04-0710.1002/solr.202300072https://infoscience.epfl.ch/handle/20.500.14299/197439WOS:000964044500001The carrier transport layer plays a critical role in high efficiency and stable perovskite solar cells (PSCs). Herein, CsPbBr3 quantum dots-sensitized mesoporous TiO2 (CPB-TiO2) electron transport layer for fabricating high-quality perovskite films with enhanced phase stability is developed. The CPB-TiO2 layer enhances the perovskite crystallinity, phase stability, and reduces the nonradiative carrier recombination in PSCs. As a result, the CPB-TiO2 significantly improves the power conversion efficiency of FAPbI(3) PSCs from 23.11% to 24.46% and reduces the device hysteresis. The CPB-TiO2-FAPbI(3) device shows enhanced stability, retaining 90% of its initial efficiency after 500 h operation at maximum power point tracking under 1 sun illumination, whereas the control device degrades to 80% of initial performance in the first 200 h. In addition, this strategy is applicable to CsPbI3 perovskite, which provides a new and general strategy for preparing high-efficiency PSCs.Energy & FuelsMaterials Science, MultidisciplinaryMaterials Sciencecspbi3fapbi(3)perovskite solar cellstio2 electron transport layershalide perovskiteslightinstabilitysno2text::journal::journal article::research article