首页|Electrochemically Deposited CZTSSe Thin Films for Monolithic Perovskite Tandem Solar Cells with Efficiencies Over 17％

Electrochemically Deposited CZTSSe Thin Films for Monolithic Perovskite Tandem Solar Cells with Efficiencies Over 17％

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In spite of the high potential economic feasibility of the tandem solar cells consisting of the halide perovskite and the kesterite Cu2ZnSn(S,Se)4(CZTSSe),they have rarely been demonstrated due to the difficulty in implementing solution-processed perovskite top cell on the rough surface of the bottom cells.Here,we firstly demonstrate an efficient monolithic two-terminal perovskite/CZTSSe tandem solar cell by significantly reducing the surface roughness of the electrochemically deposited CZTSSe bottom cell.The surface roughness(Rrms)of the CZTSSe thin film could be reduced from 424 to 86 nm by using the potentiostatic mode rather than using the conventional galvanostatic mode,which can be further reduced to 22 nm after the subsequent ion-milling process.The perovskite top cell with a bandgap of 1.65 eV could be prepared using a solution process on the flattened CZTSSe bottom cell,resulting in the efficient perovskite/CZTSSe tandem solar cells.After the current matching between two subcells involving the thickness control of the perovskite layer,the best performing tandem device exhibited a high conversion efficiency of 17.5％without the hysteresis effect.

CZTSSemonolithic tandem solar cellsperovskitesolution processsurface roughness control

Sun Kyung Hwang、Ik Jae Park、Se Won Seo、Jae Hyun Park、So Jeong Park、Jin Young Kim

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Department of Materials Science and Engineering, Seoul National University, Seoul 08826, Korea

Department of Applied Physics,Sookmyung Women's University,Seoul 04310,Korea

Research Institute of Advanced Materials and Systems,Sookmyung Women's University,Seoul 04310,Korea

Department of Materials Science and Engineering,Seoul National University,Seoul 08826,Korea

Research Institute of Advanced Materials(RIAM),Seoul National University,Seoul 08826,Korea

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2024

10.1002/eem2.12489

能源与环境材料(英文)

能源与环境材料(英文)

ISSN：
年,卷(期)：2024.7(1)