The application of Al2TiO5 at the TiO2/perovskite interface to decrease carrier losses in solar cells

Herein we describe the mechanism of crystallization of Al3+ with amorphous TiO2 on a TiO2 film, and found that the resultant Al2TiO5 was able to improve the average efficiency of planar perovskite solar cells (PSCs) from 15.4 to 17.2%. The electron lifetime in these Al-PSCs was about 3 times longer...

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Bibliographic Details
Published in:Journal of materials chemistry. A, Materials for energy and sustainability Materials for energy and sustainability, 2017-02, Vol.5 (7), p.3691-3698
Main Authors: Zhao, Bingxin, Wen, Xiaoru, Jiang, Minlin, Wu, Jiamin, Lan, Fei, Wang, Jinshu, den Engelsen, Daniel, Li, Guangyong, Gao, Di
Format: Article
Language:English
Subjects:
Crystal defects
Crystallization
Efficiency
Perovskites
Photovoltaic cells
Resultants
Solar cells
Titanium dioxide
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Summary:Herein we describe the mechanism of crystallization of Al3+ with amorphous TiO2 on a TiO2 film, and found that the resultant Al2TiO5 was able to improve the average efficiency of planar perovskite solar cells (PSCs) from 15.4 to 17.2%. The electron lifetime in these Al-PSCs was about 3 times longer than that in unmodified PSCs. The O 1s X-ray photoelectron spectrum of the TiO2/CH3NH3PbI3 interface indicated that the oxygen vacancy or defect peak decreased by more than 31% on modifying the interface with Al2TiO5. The stability of the PSCs was improved substantially: Al-PSCs had still 88% of their initial value after 1440 hours, while the efficiency of the reference PSCs decreased to 68% of their initial value.
ISSN:2050-7488
2050-7496
DOI:10.1039/c6ta10468a