Perovskite solar cells with atomically coherent interlayers on SnO2 electrodes

被引:1814
作者
Min, Hanul [1 ]
Lee, Do Yoon [1 ]
Kim, Junu [2 ]
Kim, Gwisu [1 ]
Lee, Kyoung Su [1 ]
Kim, Jongbeom [1 ]
Paik, Min Jae [1 ]
Kim, Young Ki [3 ]
Kim, Kwang S. [2 ]
Kim, Min Gyu [4 ]
Shin, Tae Joo [3 ]
Seok, Sang Il [1 ]
机构
[1] Ulsan Natl Inst Sci & Technol, Dept Energy & Chem Engn, Ulsan, South Korea
[2] Ulsan Natl Inst Sci & Technol, Dept Chem, Ulsan, South Korea
[3] Ulsan Natl Inst Sci & Technol, UNIST Cent Res Facil, Ulsan, South Korea
[4] Pohang Univ Sci & Technol, Beamline Res Div, Pohang Accelerator Lab, Pohang, South Korea
基金
新加坡国家研究基金会;
关键词
FORMAMIDINIUM LEAD IODIDE; THIN-FILM; EFFICIENT; PASSIVATION; TEMPERATURE; PERFORMANCE; LAYER;
D O I
10.1038/s41586-021-03964-8
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
In perovskite solar cells, the interfaces between the perovskite and charge-transporting layers contain high concentrations of defects (about 100 times that within the perovskite layer), specifically, deep-level defects, which substantially reduce the power conversion efficiency of the devices(1-3). Recent efforts to reduce these interfacial defects have focused mainly on surface passivation(4-6). However, passivating the perovskite surface that interfaces with the electron-transporting layer is difficult, because the surface-treatment agents on the electron-transporting layer may dissolve while coating the perovskite thin film. Alternatively, interfacial defects may not be a concern if a coherent interface could be formed between the electron-transporting and perovskite layers. Here we report the formation of an interlayer between a SnO2 electron-transporting layer and a halide perovskite light-absorbing layer, achieved by coupling Cl-bonded SnO2 with a Cl-containing perovskite precursor. This interlayer has atomically coherent features, which enhance charge extraction and transport from the perovskite layer, and fewer interfacial defects. The existence of such a coherent interlayer allowed us to fabricate perovskite solar cells with a power conversion efficiency of 25.8 per cent (certified 25.5 per cent)under standard illumination. Furthermore, unencapsulated devices maintained about 90 per cent of their initial efficiency even after continuous light exposure for 500 hours. Our findings provide guidelines for designing defect-minimizing interfaces between metal halide perovskites and electron-transporting layers. An atomically coherent interlayer between the electron-transporting and perovskite layers in perovskite solar cells enhances charge extraction and transport from the perovskite, enabling high power conversion efficiency.
引用
收藏
页码:444 / +
页数:20
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