Giant Light-Emission Enhancement in Lead Halide Perovskites by Surface Oxygen Passivation,Nano Letters

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Giant Light-Emission Enhancement in Lead Halide Perovskites by Surface Oxygen Passivation
Nano Letters ( IF 9.6 ) Pub Date : 2018-09-28 00:00:00 , DOI: 10.1021/acs.nanolett.8b02887
Dylan Lu _{1,

2} , Ye Zhang _{1,

2} , Minliang Lai ₁ , Alex Lee _{1,

2} , Chenlu Xie ₁ , Jia Lin _{1,

2} , Teng Lei ₁ , Zhenni Lin _{2,

3} , Christopher S. Kley ₁ , Jianmei Huang ₁ , Eran Rabani ₁ , Peidong Yang _{1,

2,

3,

4}

Affiliation

Surface condition plays an important role in the optical performance of semiconductor materials. As new types of semiconductors, the emerging metal-halide perovskites are promising for next-generation optoelectronic devices. We discover significantly improved light-emission efficiencies in lead halide perovskites due to surface oxygen passivation. The enhancement manifests close to 3 orders of magnitude as the perovskite dimensions decrease to the nanoscale, improving external quantum efficiencies from <0.02% to over 12%. Along with about a 4-fold increase in spontaneous carrier recombination lifetimes, we show that oxygen exposure enhances light emission by reducing the nonradiative recombination channel. Supported by X-ray surface characterization and theoretical modeling, we propose that excess lead atoms on the perovskite surface create deep-level trap states that can be passivated by oxygen adsorption.

中文翻译：

表面氧钝化增强卤化钙钛矿中巨大的发光

表面条件在半导体材料的光学性能中起着重要作用。作为新型半导体，新兴的金属卤化物钙钛矿有望用于下一代光电器件。我们发现由于表面氧钝化，卤化钙钛矿中的发光效率大大提高。随着钙钛矿尺寸减小到纳米级，增强表现出接近3个数量级，从而将外部量子效率从<0.02％提高到超过12％。随着自发载流子复合寿命的增加约4倍，我们表明氧暴露通过减少非辐射重组通道而增强了光发射。在X射线表面表征和理论建模的支持下，

更新日期：2018-09-28

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