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Updated: May 11, 2026

Monovalent Cation Doping of CH3NH3PbI3 for Efficient Perovskite Solar Cells
Published on: March 19, 2017
Defect Suppression in Triple-Cation Perovskites via Zwitterionic Choline Bitartrate for Scalable High-Efficiency
Peng Gao1,2, YongGang Guo2, Linfeng Ye2
1Ministry of Education Key Laboratory of Micro/Nano Systems for Aerospace, Key Laboratory of Micro- and Nano-Electro-Mechanical Systems of Shaanxi Province, School of Mechanical Engineering, Northwestern Polytechnical University, Xi'an 710072, China.
Abstract:
To overcome the instability and scalability challenges of perovskite solar cells, we engineer zwitterionic choline bitartrate as a dual-functional additive. Its tartrate anions passivate undercoordinated Pb2+ defects through multidentate coordination, while choline cations suppress halide vacancy migration. This synergistic mechanism enables CsFAMA-based devices to achieve 24.92% efficiency (0.05 cm2) with exceptional scalability of 24.12% (1 cm2) and 21.37% (36 cm2 modules), while suppressing PbI2 impurities, enlarging grains, and retaining >95% of the initial power conversion efficiency after 600 h at 85 °C, establishing a new paradigm for stable, high-performance perovskite photovoltaics.
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