期刊
JOURNAL OF POWER SOURCES
卷 488, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.jpowsour.2021.229451
关键词
Potassium hexafluorophosphate; SnO2 quantum dots; Interface defect passivation; Perovskite solar cells
资金
- Science Foundation [K201827, K201504]
- 11th Graduate Education Innovation Fund [CX2019251]
- Open Foundation of Hubei Key Laboratory of Optical Information and Pattern Recognition of Wuhan Institute of Technology [201905]
- National Natural Science Foundation of China [11904270, 11574241, 11804257]
- Natural Science Foundation of Hubei Province [2019CFB169]
Utilizing potassium hexafluorophosphate as an interface material can improve carrier transport and reduce charge recombination in perovskite solar cells, leading to higher efficiency and consistent performance over time.
The interface modulation between perovskite and carrier-transport layers via an appropriate chemical bond is an effective way to achieve the promoted carrier extraction and the reduced charge recombination for high efficiency perovskite solar cells (PSCs). Here, a multifunctional material potassium hexafluorophosphate (KPF6) is employed as an effective interface material between SnO2 quantum dots (QDs) and perovskite. At perovskite side, KPF6 could react with perovskite through the strong hydrogen bonds between PF6- group and organic cations, which could re-orientate or redistribute the organic cation groups. Meanwhile, KPF6 could react with SnO2 QD through the strong ionic bonds between PF6- group and Sn4+/Sn2+ at the SnO2 QD side, which could passivate the interface defects to suppress the non-radiative recombination for the improved electron transferring. Consequently, a champion PCE over 21% comes from the PSCs with 0.5 mg/ml KPF6 treated the SnO2 QD/perovskite interface, and the devices maintain similar to 90% of initial PCEs after 720-h storage in dry air.
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