Open AccessHydrazine Hydrate‐Induced Surface Modification of CdS Electron Transport Layer Enables 10.30%‐Efficient Sb 2 (S,Se) 3 Planar Solar Cells
Author(s) -
Li Jianmin,
Zhao Yuqi,
Li Chuang,
Wang Shaoying,
Chen Xueling,
Gong Junbo,
Wang Xiaomin,
Xiao Xudong
Publication year - 2022
Publication title -
advanced science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.388
H-Index - 100
ISSN - 2198-3844
DOI - 10.1002/advs.202202356
Subject(s) - materials science , band gap , chalcogenide , solar cell , antimony , optoelectronics , photovoltaic system , layer (electronics) , bismuth , hydrate , chemical engineering , nanotechnology , metallurgy , chemistry , ecology , engineering , biology , organic chemistry
Antimony selenosulfide (Sb 2 (S,Se) 3 ), a simple alloyed compound containing earth‐abundant constituents, with a tunable bandgap and high absorption coefficient has attracted significant attention in high‐efficiency photovoltaic applications. Optimizing interfacial defects and absorber layers to a high standard is essential in improving the efficiency of Sb 2 (S,Se) 3 solar cells. In particular, the electron transport layer (ETL) greatly affects the final device performance of the superstrate structure. In this study, a simple and effective hydrazine hydrate (N 2 H 4 ) solution post‐treatment is proposed to modify CdS ETL in order to enhance Sb 2 (S,Se) 3 solar cell efficiency. By this process, oxides and residual chlorides, caused by CdCl 2 treated CdS under a high temperature over 400 °C in air, are appropriately removed, rendering smoother and flatter CdS ETL as well as high‐quality Sb 2 (S,Se) 3 thin films. Furthermore, the interfacial energy band alignment and recombination loss are both improved, resulting in an as‐fabricated FTO/CdS‐N 2 H 4 /Sb 2 (S,Se) 3 /spiro‐OMeTAD/Au solar cell with a high PCE of 10.30%, placing it in the top tier of Sb‐based solar devices. This study provides a fresh perspective on interfacial optimization and promotes the future development of antimony chalcogenide‐based planar solar cells.