Cobalt Chloride Hexahydrate Assisted in Reducing Energy Loss in Perovskite Solar Cells with Record Open-Circuit Voltage of 1.20 V

被引:145
作者
Wang, Pengyang [1 ,2 ,3 ,4 ]
Chen, Bingbing [1 ,2 ,3 ,4 ]
Li, Renjie [1 ,2 ,3 ,4 ]
Wang, Sanlong [1 ,2 ,3 ,4 ]
Ren, Ningyu [1 ,2 ,3 ,4 ]
Li, Yucheng [1 ,2 ,3 ,4 ]
Mazumdar, Sayantan [1 ,2 ,3 ,4 ]
Shi, Biao [1 ,2 ,3 ,4 ]
Zhao, Ying [1 ,2 ,3 ,4 ]
Zhang, Xiaodan [1 ,2 ,3 ,4 ]
机构
[1] Nankai Univ, Solar Energy Convers Ctr, Renewable Energy Convers & Storage Ctr, Inst Photoelect Thin Film Devices & Technol, Tianjin 300350, Peoples R China
[2] Key Lab Photoelect Thin Film Devices & Technol Ti, Tianjin 300350, Peoples R China
[3] Minist Educ, Engn Res Ctr Thin Film Photoelect Technol, Tianjin 300350, Peoples R China
[4] Collaborat Innovat Ctr Chem Sci & Engn Tianjin, Tianjin 300072, Peoples R China
基金
中国博士后科学基金;
关键词
EFFICIENT; PASSIVATION;
D O I
10.1021/acsenergylett.1c00443
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
SnO2 is widely used and one of the most efficient electron transport layers in perovskite solar cells (PSCs). However, SnO2 films often contain detrimental defects and may also have mismatches in energy level alignment with perovskite films, thus limiting the open-circuit voltage (V-OC). Managing the defects and band structure are critical to reduce energy loss in PSCs. Herein, cobalt chloride hexahydrate (CoCl2 center dot 6H(2)O) is introduced into a SnO2 film, which shows favorable energy level alignment and better charge extraction. Correspondingly, an enhanced V-OC up to 1.20 V was achieved along with an efficiency of 23.829%, which is the record open-circuit voltage at the optical band gap of 1.54 eV in planar structure PSCs. Moreover, the target devices show enhanced stability, which retains 83.5% of their initial efficiencies after 200 h under continuous irradiation. The doping method provides an effective strategy for reducing energy loss to further enhance the efficiency of PSCs.
引用
收藏
页码:2121 / 2128
页数:8
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