Intermediate Phase‐Assisted Sequential Deposition Toward 15.24%‐Efficiency Carbon‐Electrode Cspbi2br Perovskite Solar Cells

• DOI: 10.1002/solr.202200020
• Publication Date: 2022-02-16T20:44:08Z
• Authors: Weidong Zhu; Junxiao Ma; Wenming Chai; Tianjiao Han; Dandan Chen; Xiaoping Xie; Gang Liu; Peng Dong; He Xi; Dazheng Chen; Jincheng Zhang; Chunfu Zhang; Yue Hao
• Keywords: Passivation; Deposition; Thermal Stability; Carbon fibers

All‐inorganic perovskite CsPbI 2 Br is emerging as a promising absorber material for solar cells (PSCs) due to its superior photophysical properties and thermal stability. However, there are still many great challenges obtaining high‐quality, phase‐stable, thick films in ambient air promote further development of the PSCs. Herein, first time, an intermediate phase‐assisted sequential deposition desired proposed. It carried out by sequentially spin‐coating PbBr CsI precursors onto substrate air, during which Ruddlesden–Popper (R–P) phase film composed Cs‐Pb‐I‐Br complex produced. After annealing, transformed into consisting grains CsBr species through spinodal decomposition reaction. The as‐obtained holds full coverage, micro‐sized grains, excellent Moreover, located at grain boundaries can effectively passivate defects. Therefore, carbon‐electrode PSC with such yields optimized efficiency 15.24%, coupled remarkable photovoltage 1.312 V stability relative humidity 60–70%. achieved herein among record efficiencies PSCs based on various all‐inorganic perovskites reported currently.