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Suppression and Reversion of Light-Induced Phase Separation in Mixed-Halide Perovskites by Oxygen Passivation AITranslate

Weisheng Fan; Yongliang Shi; Tongfei Shi; Shenglong Chu; Wenjing Chen; Kester O. Ighodalo; Jin Zhao; Xinhua Li; Zhengguo Xiao;
University of Science and Technology of China; University of Science and Technology of China; Institute of Solid State Physics; University of Science and Technology of China; University of Science and Technology of China; University of Science and Technology of China; University of Science and Technology of China; Institute of Solid State Physics; University of Science and Technology of China
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Abstract AITranslate

Mixed-halide perovskites (MHPs), such as methylammonium lead bromide–iodide, CH3NH3Pb(BrxI1–x)3 (0 < x < 1), are very promising candidates for tandem solar cells and wavelength-tunable light-emitting diodes (LEDs) due to their tunable bandgaps. However, uniform MHPs undergo phase separation under visible light irradiation or an electric field, and the reason is still under debate. In this work, we report that the phase separation can be dramatically suppressed by oxygen passivation under light illumination. More excitingly, we observe that phase-separated MHPs can be recovered to their original uniform state in an oxygen environment. Theoretical calculations demonstrate that oxygen atoms can effectively passivate traps in MHPs and occupy halide vacancies, thus suppressing halide redistribution and phase separation. Our results show that with sophisticated trap passivation techniques, phase-stable MHPs are attainable.

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DOI：https://doi.org/10.1021/acsenergylett.9b01383

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Citation Information:

Mixed-halide perovskites (MHPs), such as methylammonium lead bromide–iodide, CH3NH3Pb(BrxI1–x)3 (0 < x < 1), are very promising candidates for tandem solar cells and wavelength-tunable light-emitting diodes (LEDs) due to their tunable bandgaps. However, uniform MHPs undergo phase separation under visible light irradiation or an electric field, and the reason is still under debate. In this work, we report that the phase separation can be dramatically suppressed by oxygen passivation under light illumination. More excitingly, we observe that phase-separated MHPs can be recovered to their original uniform state in an oxygen environment. Theoretical calculations demonstrate that oxygen atoms can effectively passivate traps in MHPs and occupy halide vacancies, thus suppressing halide redistribution and phase separation. Our results show that with sophisticated trap passivation techniques, phase-stable MHPs are attainable.

quote

GB/T 7714-2015 [1] Weisheng Fan, Yongliang Shi, Tongfei Shi, et al. ACS Energy Letters, 2019(4). DOI:10.1021/acsenergylett.9b01383.
MLA [1] Weisheng Fan, et al., ACS Energy Letters, no. 4, 2019, https://doi.org/10.1021/acsenergylett.9b01383.
APA [1] Weisheng Fan, Yongliang Shi, Tongfei Shi, Shenglong Chu, Wenjing Chen, Kester O. Ighodalo, Jin Zhao, Xinhua Li, & Zhengguo Xiao. (2019). ACS Energy Letters(4). https://doi.org/10.1021/acsenergylett.9b01383
IEEE [1] Weisheng Fan, Yongliang Shi, Tongfei Shi, Shenglong Chu, Wenjing Chen, Kester O. Ighodalo, Jin Zhao, Xinhua Li, and Zhengguo Xiao, ACS Energy Letters, no. 4, 2019, doi: 10.1021/acsenergylett.9b01383.