The band alignment at the front interfaces is crucial for the performance of Sb2Se3 solar cell with super-strate configuration.Herein,a SnO2/TiO2 thin film,demonstrated beneficial for carrier transport in Sb2Se3 device by the first-principle calculation and experiment,is proposed to reduce the parasitic absorption caused by CdS and optimize the band alignment of Sb2Se3 solar cell.Thanks to the desirable transmit-tance of SnO2/TiO2 layer,the Sb2Se3 solar cell with SnO2/TiO2/(CdS-38 nm)electron transport layer per-formances better than(CdS-70 nm)/Sb2Se3 solar cell.The optimized band alignment,the reduced interface defects and the decreased current leakage of Sb2Se3 solar cell enable the short-circuit current density,fill factor,open-circuit voltage and efficiency of the Sb2Se3 solar cell increase by 26.7％,112％,33.1％and 250％respectively when comparing with TiO2/Sb2Se3 solar cell without modification.Finally,an easily prepared SnO2/TiO2/CdS ETL is successfully applied on Sb2Se3 solar cell by the first time and con-tributes to the best efficiency of 7.0％in this work,which is remarkable for Sb2Se3 solar cells free of hole transporting materials and toxic CdCl2 treatment.This work is expected to provide a valuable reference for future ETL design and band alignment for Sb2Se3 solar cell and other optoelectronic devices.

Weihuang Wang;Zixiu Cao;Xu Zuo;Li Wu;Jingshan Luo;Yi Zhang

Institute of Photoelectronic Thin Film Devices and Technology and Tianjin Key Laboratory of Thin Film Devices and Technology,Nankai University,Tianjin 300350,China;College of Electronic Information and Optical Engineering,Nankai University,Tianjin 300350,China;The MOE Key Laboratory of Weak-Light Nonlinear Photonics,School of Physics,Nankai University,Tianjin 300071,China

能源化学

[1]Weihuang Wang;Zixiu Cao;Xu Zuo;Li Wu;Jingshan Luo;Yi Zhang-.Double interface modification promotes efficient Sb2Se3 solar cell by tailoring band alignment and light harvest)[J].能源化学,2022(07):191-200

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