首页|Surface-functionalized hole-selective monolayer for high efficiency single-junction wide-bandgap and monolithic tandem perovskite solar cells
Surface-functionalized hole-selective monolayer for high efficiency single-junction wide-bandgap and monolithic tandem perovskite solar cells
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Carbazole moiety-based 2PACz([2-(9H-carbazol-9-yl)ethyl]phosphonic acid)self-assembled monolayers(SAMs)are excellent hole-selective contact(HSC)materials with abilities to excel the charge-transfer-dynamics of perovskite solar cells(PSCs).Herein,we report a facile but powerful method to functionalize the surface of 2PACz-SAM,by which reproducible,highly stable,high-efficiency wide-bandgap PSCs can be obtained.The 2PACz surface treatment with various donor number solvents improves assembly of 2PACz-SAM and leave residual surface-bound solvent molecules on 2PACz-SAM,which increases per-ovskite grain size,retards halide segregation,and accelerates hole extraction.The surface functionaliza-tion achieves a high power conversion efficiency(PCE)of 17.62％for a single-junction wide-bandgap(～1.77 eV)PSC.We also demonstrate a monolithic all-perovskite tandem solar cell using surface-engineered HSC,showing high PCE of 24.66％with large open-circuit voltage of 2.008 V and high fill-factor of 81.45％.Our results suggest this simple approach can further improve the tandem device,when coupled with a high-performance narrow-bandgap sub-cell.
Perovskite solar cells2PACzMonolithic tandem solar cellsWide bandgap
School of Materials Science and Engineering,Kyungpook National University,Daegu 41566,Republic of Korea
Department of Materials Science and Engineering,and Optoelectronics Convergence Research Center,Chonnam National University,Gwangju 61186,Republic of Korea
Department of Materials Science and Engineering,Korea University,Seoul 02841,Republic of Korea
Department of Nanotechnology and Advanced Materials Engineering,Sejong University,Seoul 05006,Republic of Korea
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National Research Foundation of Korea(NRF)the Ministry of Science,ICTNational Research Foundation of Korea(NRF)the Ministry of Science,ICTNational Research Foundation of Korea(NRF)the Ministry of Science,ICTKorea Electric Power Corporation
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