Universität zu Köln

Wu, Xin, Zhang, Lu, Xu, Zhuo, Olthof, Selina ORCID: 0000-0002-8871-1549, Ren, Xiaodong, Liu, Yucheng, Yang, Dong, Gao, Fei and Liu, Shengzhong (Frank) (2020). Efficient perovskite solar cells via surface passivation by a multifunctional small organic ionic compound. J. Mater. Chem. A, 8 (17). S. 8313 - 8323. CAMBRIDGE: ROYAL SOC CHEMISTRY. ISSN 2050-7496

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Abstract

Surface passivation is a proven strategy for preparing high efficiency planar perovskite solar cells. Herein, we report an effective surface passivation strategy using the multifunctional small organic ionic compound 1-ethylpyridinium chloride (EPC) in combination with (FAPbI(3))(0.95)(MAPbBr(3))(0.05). It is found that the nitrogen atom in the pyridine group forms chemical bonds with under-coordinated lead ions in the perovskite film whereby the defect density is significantly reduced. The organic groups, including ethyl and pyridine, furthermore provide higher hydrophobicity for improved moisture stability. Finally, the chlorine anions were also found to play an important role in the defect passivation while further improving the perovskite crystallinity. Detailed theoretical study confirms that the EPC is indeed a good passivation agent for multiple defects. As a result, the power conversion efficiency is increased from 19.52% to as high as 21.19% via the EPC passivation and the devices show reduced hysteresis and increased stability.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Wu, Xin UNSPECIFIED UNSPECIFIED UNSPECIFIED Zhang, Lu UNSPECIFIED UNSPECIFIED UNSPECIFIED Xu, Zhuo UNSPECIFIED UNSPECIFIED UNSPECIFIED Olthof, Selina UNSPECIFIED orcid.org/0000-0002-8871-1549 UNSPECIFIED Ren, Xiaodong UNSPECIFIED UNSPECIFIED UNSPECIFIED Liu, Yucheng UNSPECIFIED UNSPECIFIED UNSPECIFIED Yang, Dong UNSPECIFIED UNSPECIFIED UNSPECIFIED Gao, Fei UNSPECIFIED UNSPECIFIED UNSPECIFIED Liu, Shengzhong (Frank) UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-334247
DOI:	10.1039/d0ta02222e
Journal or Publication Title:	J. Mater. Chem. A
Volume:	8
Number:	17
Page Range:	S. 8313 - 8323
Date:	2020
Publisher:	ROYAL SOC CHEMISTRY
Place of Publication:	CAMBRIDGE
ISSN:	2050-7496
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language HIGHLY EFFICIENT; LAYERS; FILMS Multiple languages Chemistry, Physical; Energy & Fuels; Materials Science, Multidisciplinary Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/33424