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Updated: Apr 17, 2026
Monovalent Cation Doping of CH3NH3PbI3 for Efficient Perovskite Solar Cells
Published on: March 19, 2017
Halide-Cation Interactions Enable Controlled Crystallization and Defect Minimization in High-Performance
Jingnan Wang1,2,3, Kexuan Sun2, Lin Xie4
1School of Materials Science and Chemical Engineering, Ningbo University, Ningbo, Zhejiang, China.
None:
This work demonstrates that synergistic passivation using Cl-salt or F-salt significantly enhances the performance of wide-bandgap (WBG) perovskite subcells and all-perovskite tandem solar cells (TSCs). The improved performance is attributed to the dual mechanisms of PF6 - coordination with Pb2 + and the formation of N─H···Cl/F hydrogen bonds, which collectively promote ordered crystal growth, suppress phase segregation in WBG perovskites, and improve overall film quality. Consequently, the modified WBG subcells achieve power conversion efficiencies (PCEs) of up to 20.5% (Cl-salt) and 20.3% (F-salt), with notable enhancements in open-circuit voltage (VOC) and fill factor (FF). When integrated into tandem devices, the treated cells yield remarkable PCEs of 29.2% (Cl-salt) and 29.3% (F-salt), and maintain 87% of the initial PCE after maximum power point tracking (MPP) under 1 sun illumination for 700 h.
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