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Enhanced Light Harvesting in Perovskite Solar Cells by a Bioinspired Nanostructured Back Electrode
Author(s) -
Wei Jian,
Xu RuiPeng,
Li YanQing,
Li Chi,
Chen JingDe,
Zhao XinDong,
Xie ZhongZhi,
Lee ChunSing,
Zhang WenJun,
Tang JianXin
Publication year - 2017
Publication title -
advanced energy materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.08
H-Index - 220
eISSN - 1614-6840
pISSN - 1614-6832
DOI - 10.1002/aenm.201700492
Subject(s) - materials science , perovskite (structure) , optoelectronics , electrode , energy conversion efficiency , halide , photovoltaic system , open circuit voltage , polarization (electrochemistry) , perovskite solar cell , solar cell , nanostructure , plasmonic solar cell , nanotechnology , voltage , polymer solar cell , chemical engineering , inorganic chemistry , ecology , chemistry , physics , quantum mechanics , engineering , biology
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 (CH 3 NH 3 PbI 3− x Cl x ) 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.