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

被引：62

作者：

Fan, Weisheng ^{[1
,2
,3
]}

Shi, Yongliang ^{[2
,3
]}

Shi, Tongfei ^{[1
]}

Chu, Shenglong ^{[1
,2
,3
]}

Chen, Wenjing ^{[2
,3
]}

Ighodalo, Kester O. ^{[2
,3
]}

Zhao, Jin ^{[2
,3
]}

Li, Xinhua ^{[1
]}

Xiao, Zhengguo ^{[2
,3
]}

机构：

[1] Chinese Acad Sci, Inst Solid State Phys, Key Lab Mat Phys, Hefei 230031, Anhui, Peoples R China

[2] Univ Sci & Technol China, Hefei Natl Lab Phys Sci Microscale, Hefei 230026, Anhui, Peoples R China

[3] Univ Sci & Technol China, Dept Phys, CAS Key Lab Strongly Coupled Quantum Matter Phys, Hefei 230026, Anhui, Peoples R China

来源：

ACS ENERGY LETTERS | 2019年 / 4卷 / 09期

基金：

中国国家自然科学基金;

关键词：

HYBRID PEROVSKITES; SEGREGATION; IMPACT; TRIHALIDE; EFFICIENT; BROMIDE;

D O I：

10.1021/acsenergylett.9b01383

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Mixed-halide perovskites (MHPs), such as methyl ammonium 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.

引用

页码：2052 / 2058

页数：13

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