期刊
ADVANCED FUNCTIONAL MATERIALS
卷 31, 期 5, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.202008052
关键词
field‐ effect passivation; humidity stability; interfacial dipoles; perovskite solar cells; power conversion efficiency
类别
资金
- National Natural Science Foundation of China [11904127, 61775081, 22075101, 61904066, 61705020, 51902126]
- Program for the development of Science and Technology of Jilin province [20200801032GH, 20190103002JH]
- Thirteenth Five-Year Program for Science and Technology of Education Department of Jilin Province [JJKH20190998KJ, JJKH20200417KJ, JJKH20190550KJ]
- Special Project of Industrial Technology Research and Development in Jilin Province [2019C042-2]
- Construction Program for Innovation Research Team of Jilin Normal University [201703]
The novel field-effect passivation technique has successfully improved the power conversion efficiency of organolead halide hybrid perovskite solar cells and enhanced their humidity stability.
Organolead halide hybrid perovskite solar cells (PSCs) have become a shining star in the renewable devices field due to the sharp growth of power conversion efficiency; however, interfacial recombination and carrier-extraction losses at heterointerfaces between the perovskite active layer and the carrier transport layers remain the two main obstacles to further improve the power conversion efficiency. Here, novel field-effect passivation has been successfully induced to effectively suppress the interfacial recombination and improve interfacial charge transfer by incorporating interfacial polarization via inserting a high work function interlayer between perovskite and holes transport layer. The charge dynamics within the device and the mechanism of the field-effect passivation are elucidated in detail. The unique interfacial dipoles reinforce the built-in field and prevent the photogenerated charges from recombining, resulting in power conversion efficiency up to 21.7% with negligible hysteresis. Furthermore, the hydrophobic interlayer also suppresses the perovskite decomposition by preventing the moisture penetration, thereby improving the humidity stability of the PSCs (>91% of the initial power conversion efficiency (PCE) after 30 d in 65 +/- 5% humidity). Finally, several promising research perspectives based on field-effect passivation are also suggested for further conversion efficiency improvements and photovoltaic applications.
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