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DOE OSTI · 2394634

Chiral-structured heterointerfaces enable durable perovskite solar cells

Duan, Tianwei·You, Shuai·Chen, Min·Yu, Wenjian·Li, Yanyan·Guo, Peijun·Berry, Joseph J.·Luther, Joseph M.·Zhu, Kai·Zhou, Yuanyuan
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Abstract

Mechanical failure and chemical degradation of device heterointerfaces can strongly influence the long-term stability of perovskite solar cells (PSCs) under thermal cycling and damp heat conditions. Here, we report chirality-mediated interfaces based on R-/S-methylbenzyl-ammonium between the perovskite absorber and electron-transport layer to create an elastic yet strong heterointerface with increased mechanical reliability. This interface harnesses enantiomer-controlled entropy to enhance tolerance to thermal cycling–induced fatigue and material degradation, and a heterochiral arrangement of organic cations leads to closer packing of benzene rings, which enhances chemical stability and charge transfer. The encapsulated PSCs showed retentions of 92% of power-conversion efficiency under a thermal cycling test (-40°C to 85°C; 200 cycles over 1200 hours) and 92% under a damp heat test (85% relative humidity; 85°C; 600 hours).

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Duan, Tianwei, You, Shuai, Chen, Min, Yu, Wenjian, Li, Yanyan, Guo, Peijun, Berry, Joseph J., Luther, Joseph M., Zhu, Kai, Zhou, Yuanyuan. 2024-05-23. Chiral-structured heterointerfaces enable durable perovskite solar cells. https://doi.org/10.1126/science.ado5172

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