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Title: | Intragrain impurity annihilation for highly efficient and stable perovskite solar cells | Authors: | Cai, S Li, Z Zhang, Y Liu, T Wang, P Ju, MG Pang, S Lau, SP Zeng, XC Zhou, Y |
Issue Date: | 2024 | Source: | Nature communications, 2024, v. 15, 2329 | Abstract: | Intragrain impurities can impart detrimental effects on the efficiency and stability of perovskite solar cells, but they are indiscernible to conventional characterizations and thus remain unexplored. Using in situ scanning transmission electron microscopy, we reveal that intragrain impurity nano-clusters inherited from either the solution synthesis or post-synthesis storage can revert to perovskites upon irradiation stimuli, leading to the counterintuitive amendment of crystalline grains. In conjunction with computational modelling, we atomically resolve crystallographic transformation modes for the annihilation of intragrain impurity nano-clusters and probe their impacts on optoelectronic properties. Such critical fundamental findings are translated for the device advancement. Adopting a scanning laser stimulus proven to heal intragrain impurity nano-clusters, we simultaneously boost the efficiency and stability of formamidinium-cesium perovskite solar cells, by virtual of improved optoelectronic properties and relaxed intra-crystal strain, respectively. This device engineering, inspired and guided by atomic-scale in situ microscopic imaging, presents a new prototype for solar cell advancement. | Publisher: | Nature Publishing Group | Journal: | Nature communications | EISSN: | 2041-1723 | DOI: | 10.1038/s41467-024-46588-y | Rights: | ©The Author(s) 2024 This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/ licenses/by/4.0/. The following publication Cai, S., Li, Z., Zhang, Y. et al. Intragrain impurity annihilation for highly efficient and stable perovskite solar cells. Nat Commun 15, 2329 (2024) is available at https://doi.org/10.1038/s41467-024-46588-y. |
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