Mechanism of improving the performance of perovskite solar cells through alkali metal bis(trifluoromethanesulfonyl)imide modifying mesoporous titania electron transport layer

被引:8
作者
Ding, Bowen [2 ]
Zhao, Xiao [1 ,3 ]
Wang, Shimao [1 ,4 ]
Shan, Xueyan [1 ,3 ]
Chen, Zhe [2 ]
Deng, Zanhong [1 ,4 ]
Tao, Ruhua [1 ,4 ]
Shao, Jingzhen [1 ,4 ]
Meng, Gang [1 ,4 ]
Fang, Xiaodong [1 ,4 ,5 ]
机构
[1] Chinese Acad Sci, Anhui Inst Opt & Fine Mech, Hefei Inst Phys Sci,Key Lab Photovolta & Energy C, Anhui Prov Key Lab Photon Devices & Mat, Hefei 230031, Peoples R China
[2] Wuhan Inst Technol, Sch Mat Sci & Engn, Wuhan 430205, Peoples R China
[3] Univ Sci & Technol China, Hefei 230026, Peoples R China
[4] Adv Laser Technol Lab Anhui Prov, Hefei 230037, Peoples R China
[5] Shenzhen Technol Univ, Coll New Mat & New Energies, Shenzhen 518118, Peoples R China
基金
中国国家自然科学基金;
关键词
Alkali metal bis(trifluoromethanesulfonyl) imide; Perovskite solar cell; Interface modification; Mesoporous TiO2 film; THIN-FILMS; EFFICIENCY; INTERFACE; PASSIVATION; TIO2;
D O I
10.1016/j.jpowsour.2020.229275
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
Alkali metal bis(trifluoromethanesulfonyl)imide (TFSI) modification of TiO2 electron transport layer (ETL) has been widely adopted to improve the performance of perovskite solar cells (PSCs), however, only a handful of investigations have proposed some corresponding mechanisms, and more in-depth investigations are urgent. In this investigation, Li-TFSI and K-TFSI were adopted to modify mesoporous TiO2 (me-TiO2) ETL of PSCs, electrochemical impedance spectroscopy, photoluminescence spectrum, space-charge limited current, and X-ray photoelectron spectroscopy measurements were performed to investigate the modification mechanisms. Alkali metal-TFSI modification could passivate the oxygen vacancies in me-TiO2 ETL and suppress the charge recombination effectively, improve the contact between me-TiO2 ETL and perovskite layer and increase the conductivity of me-TiO2 ETL which lead to rapid charge extraction and transfer at ETL/perovskite interface and balance the electron flux and hole flux in devices. Moreover, sulfates induced by alkali metal-TFSI act as nucleation sites in the crystallization process of perovskite which could increase the grain size and improve the uniformity of CH3NH3PbI3 films obviously, and it is a positive factor for suppressing charge recombination and improving the cell performance. As a result, the power conversion efficiencies of the champion devices for Li-TFSI and K-TFSI modified PSCs have reached 20.02% and 19.64%, respectively.
引用
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页数:8
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