Impact of microstructure on local carrier lifetime in perovskite solar cells

被引：1934

作者：

deQuilettes, Dane W. ^{[1
]}

Vorpahl, Sarah M. ^{[1
]}

Stranks, Samuel D. ^{[2
]}

Nagaoka, Hirokazu ^{[1
]}

Eperon, Giles E. ^{[2
]}

Ziffer, Mark E. ^{[1
]}

Snaith, Henry J. ^{[2
]}

Ginger, David S. ^{[1
]}

机构：

[1] Univ Washington, Dept Chem, Seattle, WA 98195 USA

[2] Univ Oxford, Clarendon Lab, Oxford OX1 3PU, England

来源：

SCIENCE | 2015年 / 348卷 / 6235期

基金：

英国工程与自然科学研究理事会;

关键词：

HALIDE PEROVSKITES; EFFICIENT; ELECTRON; LENGTHS; PHOTOLUMINESCENCE; CRYSTALLIZATION; PASSIVATION; PERFORMANCE; CH3NH3PBI3; TRIHALIDE;

D O I：

10.1126/science.aaa5333

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

The remarkable performance of hybrid perovskite photovoltaics is attributed to their long carrier lifetimes and high photoluminescence (PL) efficiencies. High-quality films are associated with slower PL decays, and it has been claimed that grain boundaries have a negligible impact on performance. We used confocal fluorescence microscopy correlated with scanning electron microscopy to spatially resolve the PL decay dynamics from films of nonstoichiometric organic-inorganic perovskites, CH3NH3PbI3(Cl). The PL intensities and lifetimes varied between different grains in the same film, even for films that exhibited long bulk lifetimes. The grain boundaries were dimmer and exhibited faster nonradiative decay. Energy-dispersive x-ray spectroscopy showed a positive correlation between chlorine concentration and regions of brighter PL, whereas PL imaging revealed that chemical treatment with pyridine could activate previously dark grains.

引用

页码：683 / 686

页数：4

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