Multifunctional Molecule-Modified SnO2-Perovskite Interface for Efficient Planar Perovskite Solar Cells

被引:10
作者
Xin, Xu [1 ]
Yang, Jiabao [1 ]
Pu, Xingyu [1 ]
Li, Yuke [2 ,3 ]
Wang, Tong [1 ]
Chen, Hui [1 ]
Cao, Qi [1 ]
Zhang, Yixin [1 ]
Tojiboyev, Ilhom [4 ]
Salari, Hadi [5 ]
Ye, Fei [6 ]
Li, Xuanhua [1 ]
机构
[1] Northwestern Polytech Univ, Sch Mat Sci & Engn, Ctr Nano Energy Mat, State Key Lab Solidificat Proc, Xian 710072, Peoples R China
[2] Chinese Univ Hong Kong, Dept Chem, Shatin, Hong Kong 999077, Peoples R China
[3] Chinese Univ Hong Kong, Ctr Sci Modeling & Computat, Shatin, Hong Kong 999077, Peoples R China
[4] Uzbek Acad Sci, Inst Ion Plasma & Laser Technol, Durmon Yuli 33, Tashkent 100125, Uzbekistan
[5] Shiraz Univ, Fac Phys Chem, Shiraz 71345, Iran
[6] Univ Rochester, Inst Opt, New York, NY 14623 USA
基金
中国国家自然科学基金;
关键词
4-fluoro-phenylalanine; electron transport layers; perovskite; SnO; (2) interface modification; perovskite solar cells; tin oxide; HIGH-PERFORMANCE; TEMPERATURE; CRYSTALLIZATION; INTERLAYERS; FILMS;
D O I
10.1002/admi.202200102
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
The electron transport layer (ETL) is one of the determinants for the performance improvement of perovskite solar cells (PSCs). Here, a multifunctional molecule named 4-fluoro-phenylalanine (4-F-Phe) to modify the surface of tin oxide (SnO2) ETL is introduced as a novel interfacial layer for high-efficiency PSCs. The modified SnO2 ETLs exhibit an elevated Fermi level, increasing the carrier extraction and suppressing the interfacial recombination. In addition, the various functional groups of the 4-F-Phe realize strong interfacial interactions with both the bottom SnO2 ETLs and the top perovskite, which reduces trap state density significantly to promote the interfacial charge transport. As a result, power conversion efficiency (PCE) for the 4-F-Phe optimized device reaches 21.91%. Most importantly, the 4-F-Phe optimized device without encapsulation maintains 91% of its initial PCE after 2000 h at 25 degrees C with a humidity of 50 +/- 5%, and 90% of the initial PCE after 1000 h at 80 degrees C in N-2. In addition, the encapsulated devices maintain 94% of their initial efficiency under continuous 1 sun illumination for 1000 h when tracking the maximum power point at 45 degrees C. This work provides a new strategy of modifying ETL to simultaneously improve the efficiency and stability of PSCs.
引用
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页数:9
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