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Giant Light-Emission Enhancement in Lead Halide Perovskites by Surface Oxygen Passivation.
- Author(s): Lu, Dylan;
- Zhang, Ye;
- Lai, Minliang;
- Lee, Alex;
- Xie, Chenlu;
- Lin, Jia;
- Lei, Teng;
- Lin, Zhenni;
- Kley, Christopher S;
- Huang, Jianmei;
- Rabani, Eran;
- Yang, Peidong
- et al.
Published Web Location
https://doi.org/10.1021/acs.nanolett.8b02887Abstract
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.
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