Universität zu Köln

Wu, Guohua, Li, Hua, Cui, Jian ORCID: 0000-0003-4671-0115, Zhang, Yaohong ORCID: 0000-0001-7789-4784, Olthof, Selina ORCID: 0000-0002-8871-1549, Chen, Shuai, Liu, Zhike, Wang, Dapeng and Liu, Shengzhong (Frank) (2020). Solvent Engineering Using a Volatile Solid for Highly Efficient and Stable Perovskite Solar Cells. Adv. Sci., 7 (10). HOBOKEN: WILEY. ISSN 2198-3844

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Abstract

A strategy for efficaciously regulating perovskite crystallinity is proposed by using a volatile solid glycolic acid (HOCH2COOH, GA) in an FA(0.85)MA(0.15)PbI(3) (FA: HC(NH2)(2); MA: CH3NH3) perovskite precursor solution that is different from the common additive approach. Accompanied with the first dimethyl sulfoxide sublimation process, the subsequent sublimation of GA before 150 degrees C in the FA(0.85)MA(0.15)PbI(3) perovskite film can artfully regulate the perovskite crystallinity without any residual after annealing. The improved film formation upon GA modification induced by the strong interaction between GA and Pb2+ delivers a champion power conversion efficiency (PCE) as high as 21.32%. In order to investigate the role of volatility in perovskite solar cells (PSCs), nonvolatile thioglycolic acid (HSCH2COOH, TGA) with a similar structure to GA is utilized as an additive reference. Large perovskite grains are obtained by TGA modification but with obvious pinholes, which directly leads to an increased defect density accompanied by a decline in PCE. Encouragingly, the champion PCE achieved for GA-based PSC device (21.32%) is almost 13% or 20% higher than those of the control device or TGA-based device. In addition, GA-modified PSCs exhibit the best stability in light-, thermal-, and humidity-based tests due to the improved film formation.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Wu, Guohua UNSPECIFIED UNSPECIFIED UNSPECIFIED Li, Hua UNSPECIFIED UNSPECIFIED UNSPECIFIED Cui, Jian UNSPECIFIED orcid.org/0000-0003-4671-0115 UNSPECIFIED Zhang, Yaohong UNSPECIFIED orcid.org/0000-0001-7789-4784 UNSPECIFIED Olthof, Selina UNSPECIFIED orcid.org/0000-0002-8871-1549 UNSPECIFIED Chen, Shuai UNSPECIFIED UNSPECIFIED UNSPECIFIED Liu, Zhike UNSPECIFIED UNSPECIFIED UNSPECIFIED Wang, Dapeng UNSPECIFIED UNSPECIFIED UNSPECIFIED Liu, Shengzhong (Frank) UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-335100
DOI:	10.1002/advs.201903250
Journal or Publication Title:	Adv. Sci.
Volume:	7
Number:	10
Date:	2020
Publisher:	WILEY
Place of Publication:	HOBOKEN
ISSN:	2198-3844
Language:	English
Faculty:	Faculty of Mathematics and Natural Sciences
Divisions:	Faculty of Mathematics and Natural Sciences > Department of Chemistry > Institute of Physical Chemistry
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language HIGH-PERFORMANCE; FILMS; FORMAMIDINIUM; IMPROVES; HYBRID; ADDUCT; LAYERS Multiple languages Chemistry, Multidisciplinary; Nanoscience & Nanotechnology; Materials Science, Multidisciplinary Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/33510