Enhanced Light Harvesting in Perovskite Solar Cells by a Bioinspired Nanostructured Back Electrode |
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Authors: | Jian Wei Rui‐Peng Xu Yan‐Qing Li Chi Li Jing‐De Chen Xin‐Dong Zhao Zhong‐Zhi Xie Chun‐Sing Lee Wen‐Jun Zhang Jian‐Xin Tang |
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Institution: | 1. Institute of Functional Nano and Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon‐Based Functional Materials and Devices, Soochow University, Suzhou, China;2. Center of Super‐Diamond and Advanced Film (COSADF), Department of Chemistry, City University of Hong Kong, Hong Kong SAR, China;3. Center of Super‐Diamond and Advanced Film (COSADF), Department of Physics and Materials Science, City University of Hong Kong, Hong Kong SAR, China |
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Abstract: | Light management holds great promise of realizing high‐performance perovskite solar cells by improving the sunlight absorption with lower recombination current and thus higher power conversion efficiency (PCE). Here, a convenient and scalable light trapping scheme is demonstrated by incorporating bioinspired moth‐eye nanostructures into the metal back electrode via soft imprinting technique to enhance the light harvesting in organic–inorganic lead halide perovskite solar cells. Compared to the flat reference cell with a methylammonium lead halide perovskite (CH3NH3PbI3?x Clx ) absorber, 14.3% of short‐circuit current improvement is achieved for the patterned devices with moth‐eye nanostructures, yielding an increased PCE up to 16.31% without sacrificing the open‐circuit voltage and fill factor. The experimental and theoretical characterizations verify that the cell performance enhancement is mainly ascribed by the broadband polarization‐insensitive light scattering and surface plasmonic effects due to the patterned metal back electrode. It is noteworthy that this light trapping strategy is fully compatible with solution‐processed perovskite solar cells and opens up many opportunities toward the future photovoltaic applications. |
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Keywords: | grating light harvesting light trapping moth‐eye nanostructures perovskite solar cells |
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