Molecular Interaction Regulates the Performance and Longevity of Defect Passivation for Metal Halide Perovskite Solar Cells

Journal of the American Chemical Society
Yepin ZhaoYang Yang

Abstract

Defect passivation constitutes one of the most commonly used strategies to fabricate highly efficient perovskite solar cells (PSCs). However, the durability of the passivation effects under harsh operational conditions has not been extensively studied regardless of the weak and vulnerable secondary bonding between the molecular passivation agents and perovskite crystals. Here, we incorporated strategically designed passivating agents to investigate the effect of their interaction energies on the perovskite crystals and correlated these with the performance and longevity of the passivation effects. We unraveled that the passivation agents with a stronger interaction energy are advantageous not only for effective defect passivation but also to suppress defect migration. The prototypical PSCs treated with the optimal passivation agent exhibited superior performance and operational stability, retaining 81.9 and 85.3% of their initial performance under continuous illumination or nitrogen at 85 °C after 1008 h, respectively, while the reference device completely degraded during that time. This work provides important insights into designing operationally durable defect passivation agents for perovskite optoelectronic devices.

References

Nov 2, 2014·Small·Hyun Suk Jung, Nam-Gyu Park
Jun 25, 2015·Nature Communications·Christopher EamesM Saiful Islam
Apr 14, 2017·Nature·Yang Yang, Jingbi You
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Citations

May 22, 2021·ACS Applied Materials & Interfaces·Renjie ChenXiaohong Chen
Aug 4, 2021·Journal of the American Chemical Society·Robert J E WestbrookSaif A Haque
Aug 3, 2021·ACS Applied Materials & Interfaces·Xiang LiYiwang Chen
Nov 11, 2021·Science Advances·Tianyi HuangYang Yang
Nov 23, 2021·ACS Applied Materials & Interfaces·Yidong MingCongcong Wu

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