Atomic-Scale Insights into Surface Instability in Halide Perovskites
The pathway of surface structure evolution plays a vital role in determining the stability of the halide perovskites. Understanding the mechanism of surface instability and how external stimuli interact with the surface is essential for developing strategies to mitigate the degradation of halide perovskites. Here, we directly observed structural evolutions on the surface of CsPbBr<sub>3</sub> via an integrated differential phase contrast scanning transmission electron microscope. We find that surface degradation, different from bulk decomposition, follows a layer-by-layer pathway in the CsPbBr<sub>3</sub> perovskite. This layer-by-layer decomposition method further facilitated a coating strategy to mitigate the degradation via preserving the integrity of the surface layer, as verified through in situ methods. Thus, we have achieved the improved stability of perovskites and as-fabricated light-emitting diodes. These findings advance the fundamental understanding on the mechanism of surface instability and effectiveness of coating, thus providing guidance for future study of surface protection toward stable optoelectronic devices.
Authors
- Ruirong Bai (ORCID: https://orcid.org/0009-0008-1695-0728)
- Yu‐Ning Wu (ORCID: https://orcid.org/0000-0003-3970-3160)
- Jianxun Lu (ORCID: https://orcid.org/0000-0003-3163-405X)
- Osman M. Bakr (ORCID: https://orcid.org/0000-0002-3428-1002)
- Chao Ma (ORCID: https://orcid.org/0000-0001-8599-9340)
- Xin Li Song (ORCID: https://orcid.org/0000-0003-3342-9455)
- Jinhua Hong (ORCID: https://orcid.org/0000-0002-6406-1780)
- Jiayi Wang
- Siyu Li (ORCID: https://orcid.org/0000-0001-8516-401X)
- Li Zhou (ORCID: https://orcid.org/0000-0003-0650-5256)
- Jiawei Chen (ORCID: https://orcid.org/0000-0003-1381-3046)
- Peng Gao (ORCID: https://orcid.org/0000-0002-2423-5432)
- Yiliu Wang (ORCID: https://orcid.org/0000-0003-3560-9249)
- Shulin Chen (ORCID: https://orcid.org/0009-0007-2536-2074)
Institutions
- Hunan University (CN)
- Changsha University (CN)
- Peking University (CN)
- Harbin Institute of Technology (CN)
- East China Normal University (CN)
- King Abdullah University of Science and Technology (SA)
- Tsinghua University (CN)
Publication Details
- Journal
- Nano Letters
- Published
- 2024-11-22
- DOI
- https://doi.org/10.1021/acs.nanolett.4c04559
- Citations
- 8
- Primary Topic
- Perovskite Materials and Applications
- Type
- article
- Field-Weighted Citation Impact
- 1.67
Funders
- National Natural Science Foundation of China
- Natural Science Foundation of Hunan Province