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Managing Secondary Phase Lead Iodide in Hybrid Perovskites via Surface Reconstruction for High-Performance Perovskite Solar Cells with Robust Environmental Stability |
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| Authors: | Linfeng Ye Dr Pengfei Guo Dr Jie Su Kaiyuan Zhang Chen Liu Penghui Yang Wenhao Zhao Pengzhen Zhao Prof Zhe Liu Prof Jingjing Chang Dr Qian Ye Prof Hongqiang Wang |
| Institution: | 1. State Key Laboratory of Solidification Processing, Center for Nano Energy Materials, School of Materials Science and Engineering, Northwestern Polytechnical University and Shaanxi Joint Laboratory of Graphene (NPU), Xi'an, 710071 China
These authors contributed equally to this work. Contribution: ?Investigation (lead), Methodology (lead), Writing - original draft (equal), Writing - review & editing (equal);2. State Key Laboratory of Solidification Processing, Center for Nano Energy Materials, School of Materials Science and Engineering, Northwestern Polytechnical University and Shaanxi Joint Laboratory of Graphene (NPU), Xi'an, 710071 China Chongqing Innovation Center, Northwestern Polytechnical University, Chongqing, 401135 China These authors contributed equally to this work. Contribution: ?Investigation (equal), Writing - original draft (equal), Writing - review & editing (equal);3. School of Microelectronics, State Key Discipline Lab of Wide Band Gap Semiconductor Technology, Shaanxi Joint Key Lab of Graphene, Advanced Interdisciplinary Research Center for Flexible Electronics, Xidian University, Xi'an, 710071 China;4. State Key Laboratory of Solidification Processing, Center for Nano Energy Materials, School of Materials Science and Engineering, Northwestern Polytechnical University and Shaanxi Joint Laboratory of Graphene (NPU), Xi'an, 710071 China;5. State Key Laboratory of Solidification Processing, Center for Nano Energy Materials, School of Materials Science and Engineering, Northwestern Polytechnical University and Shaanxi Joint Laboratory of Graphene (NPU), Xi'an, 710071 China Chongqing Innovation Center, Northwestern Polytechnical University, Chongqing, 401135 China |
| Abstract: | Rationally managing the secondary-phase excess lead iodide (PbI2) in hybrid perovskite is of significance for pursuing high performance perovskite solar cells (PSCs), while the challenge remains on its conversion to a homogeneous layer that is robust stable against environmental stimuli. We herein demonstrate an effective strategy of surface reconstruction that converts the excess PbI2 into a gradient lead sulfate-silica bi-layer, which substantially stabilizes the perovskite film and reduces interfacial charge transfer barrier in the PSCs device. The perovskite films with such bi-layer could bear harsh conditions such as soaking in water, light illumination at 70 % relative humidity, and the damp-thermal (85 °C and 30 % humidity) environment. The resulted PSCs deliver a champion efficiency up to 24.09 %, as well as remarkable environmental stability, e.g., retaining 78 % of their initial efficiency after 5500 h of shelf storage, and 82 % after 1000 h of operational stability testing. |
| Keywords: | Environmental Stability Hybrid Perovskite Lead Iodide Perovskite Solar Cells Surface Reconstruction |