Tungstate‐mediated In‐situ Passivation of Grain Boundary Grooves in Perovskite Solar Cells

Author:

Fan Rundong1,Song Qizhen2,Huang Zijian1,Ma Yue2,Xiao Mengqi2,Huang Xudan3,Zai Huachao1,Kang Jiaqian2,Xie Haipeng4,Gao Yongli5,Wang Lina2,Zhang Yu1,Wang Lan6,Wang Feng1,Zhang Xiao2,Zhou Wentao1,Li Nengxu1,Wang Xueyun2,Bai Yang2,Liu Guilin6,Chen Qi2,Wang Lifen3,Zhou Huanping1ORCID

Affiliation:

1. School of Materials Science and Engineering Peking University Beijing 100871 (P. R. China) Beijing Key Laboratory for Theory and Technology of Advanced Battery Materials, Key Laboratory of Polymer Chemistry and Physics of Ministry of Education, BIC-ESAT Beijing 100871 P. R. China

2. Department of Materials Science and Engineering Beijing Institute of Technology Beijing 100081 P. R. China

3. Beijing National Laboratory for Condensed Matter Physics Institute of Physics, Chinese Academy of Sciences Beijing 100081 P. R. China

4. Institute of Super-Microstructure and Ultrafast Process in Advance Materials, School of physic and Electronics Central South University Changsha Hunan 410012 P. R. China

5. Department of Physics and Astronomy University of Rochester Rochester NY 14627 USA

6. School of Science Jiangnan University Wuxi 214122 P. R. China

Abstract

AbstractPossessed with advantageous optoelectronic properties, perovskites have boosted the rapid development of solution‐processed solar cells. The performance of perovskite solar cells (PSCs) is significantly weakened by the carrier loss at grain boundary grooves (GBGs); however, it receives limited attention and there lacks effective approach to solve this issue. Herein, for the first time, we constructed the tungstate/perovskite heterointerface via a “two step” in situ reaction approach that provides effective defect passivation and ensures efficient carrier dynamics at the GBGs. The exposed perovskite at grain boundaries is converted to wide‐band‐gap PbWO4 via an in‐situ reaction between Pb2+ and tungstate ions, which passivate defects due to the strong ionic bonding. Moreover, recombination loss is further suppressed via the heterointerface energetics modification based on an additional transformation from PbWO4 to CaWO4. PSCs based on this groove modification strategy showed good universality in both normal and inverted structure, with an improved efficiency of 23.25 % in the n‐i‐p device and 23.33 % in the p‐i‐n device. Stable power output of the modified device could maintain 91.7 % after around 1100 h, and the device efficiency could retain 92.5 % after aging in air for around 2110 h, and 93.1 % after aging at 85 °C in N2 for 972 h.

Funder

National Key Research and Development Program of China

National Natural Science Foundation of China

Publisher

Wiley

Subject

General Chemistry,Catalysis

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