Universität zu Köln

Suo, Jiajia, Yang, Bowen, Jeong, Jaeki ORCID: 0000-0001-9062-9934, Zhang, Tiankai, Olthof, Selina ORCID: 0000-0002-8871-1549, Gao, Feng ORCID: 0000-0002-2582-1740, Gratzel, Michael, Boschloo, Gerrit and Hagfeldt, Anders (2022). Interfacial engineering from material to solvent: A mechanistic understanding on stabilizing alpha-formamidinium lead triiodide perovskite photovoltaics. Nano Energy, 94. AMSTERDAM: ELSEVIER. ISSN 2211-3282

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Abstract

Formamidinium lead triiodide (FAPbI3) has recently been considered as the most promising candidate to achieve highly efficient perovskite solar cells (PSCs). Excitingly, the state-of-the-art highest efficiency of FAPbI3 based PSCs have reached over 25%. However, their device stability still lags behind other compositions of mixed-cation and mixed-halide perovskites. Interfacial engineering is a very powerful method to address this issue and passivation agents have been intensively developed, however there is a lack of in-depth understanding regarding the solvent selection during post-treatment. Here, we employed cyclohexylmethylammonium iodide (CMAI) as passivation agent, which is investigated using either isopropanol (IPA) or chloroform (CF) as carrier mediator to study the solvent influence on the stabilization of FAPbI3. We observed a suppressed-defect perovskite surface toward distinguished composition with 2D CMA2PbI4 domain and CMAI domain induced by IPA and CF, respectively. Remarkably, post-treatment with solution of CMAI in CF creates a strain-free environment on the perovskite surface, leading to an improved efficiency of approaching 24% and concurrently an extraordinarily stable alpha-phase FAPbI3 PSCs under operation condition, retaining 95% of its initial efficiency after 1050-hour aging. Our resulting device stability is one of the most stable FAPbI3 based PSCs reported in literature.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Suo, Jiajia UNSPECIFIED UNSPECIFIED UNSPECIFIED Yang, Bowen UNSPECIFIED UNSPECIFIED UNSPECIFIED Jeong, Jaeki UNSPECIFIED orcid.org/0000-0001-9062-9934 UNSPECIFIED Zhang, Tiankai UNSPECIFIED UNSPECIFIED UNSPECIFIED Olthof, Selina UNSPECIFIED orcid.org/0000-0002-8871-1549 UNSPECIFIED Gao, Feng UNSPECIFIED orcid.org/0000-0002-2582-1740 UNSPECIFIED Gratzel, Michael UNSPECIFIED UNSPECIFIED UNSPECIFIED Boschloo, Gerrit UNSPECIFIED UNSPECIFIED UNSPECIFIED Hagfeldt, Anders UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-681390
DOI:	10.1016/j.nanoen.2022.106924
Journal or Publication Title:	Nano Energy
Volume:	94
Date:	2022
Publisher:	ELSEVIER
Place of Publication:	AMSTERDAM
ISSN:	2211-3282
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language SOLAR-CELLS; HIGHLY EFFICIENT Multiple languages Chemistry, Physical; Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Physics, Applied Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/68139