Surface treatment via Li-bis(trifluoromethanesulfonyl) imide to eliminate the hysteresis and enhance the efficiency of inverted perovskite solar cells

被引:16
作者
Chen, Cong [1 ,2 ]
Yang, Guang [1 ]
Ma, Junjie [1 ]
Zheng, Xiaolu [1 ]
Chen, Zhiliang [1 ]
Zhang, Qi [1 ]
Fang, Guojia [1 ,2 ]
机构
[1] Wuhan Univ, Sch Phys & Technol, Minist Educ China, Key Lab Artificial Micro & Nanostruct, Wuhan 430072, Hubei, Peoples R China
[2] Wuhan Univ, Shenzhen Inst, Shenzhen 518055, Peoples R China
基金
中国国家自然科学基金;
关键词
HOLE-TRANSPORTING LAYER; HIGH-PERFORMANCE; HALIDE PEROVSKITES; LOW-TEMPERATURE; ELECTRON; OXIDE; LENGTHS; CU; PHTHALOCYANINE; EXTRACTION;
D O I
10.1039/c7tc03984k
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Recently, inverted planar perovskite solar cells (PSCs) with a p-i-n configuration have drawn tremendous interest due to their high efficiency and reduced hysteresis. It has been demonstrated that p-i-n planar PSCs employing organic hole transport materials can obtain excellent photovoltaic performance, but their high cost and poor stability have restrained their further development. Herein, we employ Li-bis-(trifluoromethanesulfonyl) imide treated NiOx (Li-treated NiOx) as an excellent and robust hole transport layer (HTL) for fabricating highly efficient and stable PSCs. Compared to the pristine NiOx, the Li-treated NiOx exhibits enhanced electrical conductivity and better band alignment, enabling fast and efficient hole transport as well as exciton separation. The PSC with a Li-treated NiOx HTL shows a significantly improved fill factor and efficiency (from 0.75, 14.46% to 0.79, 17.09%) as well as less hysteresis with satisfactory long-term stability. Furthermore, we obtain a champion efficiency of 18.03% via graded heterojunction engineering. Therefore, our results suggest Li-treated NiOx film is an effective and promising hole transport material for efficient PSCs.
引用
收藏
页码:10280 / 10287
页数:8
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