journal article·2022-12

Lewis Acid–Base Adducts for Efficient and Stable Cesium‐Based Lead Iodide‐Rich Perovskite Solar Cells

Hui Lu, Tong Li, Simin Ma, Xiaoyang Xue, Qian Wen, Yajuan Feng, Xu Zhang, Lu Zhang, Zhiqiang Wu, Kang Wang, Shengzhong (Frank) Liu

Small Methods· Volume 6· Issue 12
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Abstract

Abstract All‐inorganic cesium‐lead‐iodide (CsPbI3Br3−x (2 < x < 3)) perovskite presents preeminent photovoltaic performance and chemical stability. Unfortunately, this kind of material suffers from phase transition to a nonperovskite phase under oxidative chemical stresses. Herein, the introduction of a low concentration of Lewis acid–base adducts (LABAs) is reported to synergistically reduce defect density, optimize interfacial energy alignment, and improve device stability of CsPbI2.75Br0.24Cl0.01 (CsPbTh3) solar cells. Both theoretical simulations and experimental measurements reveal that the noncoordinating anions, PF6−, as a Lewis base can more effectively bind with undercoordinated Pb2+ to passivate iodide vacancy defects than the BF4− and absorbed I−, and thus the point defects are well suppressed. In addition, N‐propyl‐methyl piperidinium (NPMP+) is selected to assemble with PF6− in CsPbTh3 film. The NPMP+ can regulate the crystal growth and finally homogenize the grain size and decrease the trap density. Consequently, the LABAs strategy can improve the power conversion efficiency of CsPbTh3 solar cells to 19.02% under 1‐sun illumination (100 mW cm−2). Fortunately, the NPMP+ and PF6−‐treated CsPbTh3 film shows great phase stability after storage in ambient air for 250 days, and the power conversion efficiency of corresponding solar cells is almost 76% of the initial value after 60 days aging under ambient conditions.
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Research context

OpenAlex topics: Perovskite Materials and Applications · Conducting polymers and applications · Solid-state spectroscopy and crystallography

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Key Laboratory of Powder Material & Advanced Ceramics International Scientific & Technological Cooperation Base of Industrial Waste Recycling and Advanced Materials Ningxia Research Center of Silicon Target and Silicon‐Carbon Negative Materials Engineering Technology School of Materials Science & Engineering North Minzu University Yinchuan 750021 P. R. China

Key Laboratory of Applied Surface and Colloid Chemistry Ministry of Education Shaanxi Key Laboratory for Advanced Energy Devices Shaanxi Engineering Lab for Advanced Energy Technology School of Materials Science and Engineering Shaanxi Normal University Xi'an 710119 P. R. China

College of Chemistry and Chemical Engineering Ningxia Normal University Guyuan 756000 P. R. China

Dalian National Laboratory for Clean Energy iChEM Dalian Institute of Chemical Physics Chinese Academy of Sciences Dalian Liaoning 116023 P. R. China

University of the Chinese Academy of Sciences Beijing 100039 P. R. China

Funding

Fundamental Research Funds for the Central Universities · North Minzu University · National Natural Science Foundation of China · National Key Research and Development Program of China · China Postdoctoral Science Foundation · Natural Science Foundation of Ningxia Province

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