Suppression and Reversion of Light-Induced Phase Separation in Mixed-Halide Perovskites by Oxygen Passivation,ACS Energy Letters

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Suppression and Reversion of Light-Induced Phase Separation in Mixed-Halide Perovskites by Oxygen Passivation
ACS Energy Letters ( IF 19.3 ) Pub Date : 2019-07-31 00:00:00 , DOI: 10.1021/acsenergylett.9b01383
Weisheng Fan _{1,

2,

3} , Yongliang Shi _{2,

3} , Tongfei Shi ₁ , Shenglong Chu _{1,

2,

3} , Wenjing Chen _{2,

3} , Kester O. Ighodalo _{2,

3} , Jin Zhao _{2,

3} , Xinhua Li ₁ , Zhengguo Xiao _{2,

3}

Affiliation

Mixed-halide perovskites (MHPs), such as methylammonium lead bromide–iodide, CH₃NH₃Pb(Br_xI_1–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.

中文翻译：

氧钝化对卤化钙钛矿中光诱导相分离的抑制和逆转

混合卤化物钙钛矿（MHP），例如甲基铵溴化碘化铅，CH ₃ NH ₃ Pb（Br _x I _{1– x}）₃（0 < x<1），由于其带隙可调，因此非常适合用于串联太阳能电池和波长可调发光二极管（LED）。但是，均匀的MHP在可见光照射或电场作用下会发生相分离，其原因仍在争论中。在这项工作中，我们报告说，在光照下氧钝化可以显着抑制相分离。更令人兴奋的是，我们观察到在氧气环境中，相分离的MHP可以恢复到其原始的均匀状态。理论计算表明，氧原子可以有效钝化MHP中的陷阱并占据卤化物空位，从而抑制卤化物的重新分布和相分离。我们的结果表明，通过先进的阱钝化技术，可以实现相稳定的MHP。

更新日期：2019-07-31

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