Universität zu Köln

Mahmoudi, Tahmineh, Rho, Won-Yeop, Kohan, Mohammadhosein, Im, Yeon Ho, Mathur, Sanjay and Hahn, Yoon-Bong (2021). Suppression of Sn2+/Sn4+ oxidation in tin-based perovskite solar cells with graphene-tin quantum dots composites in active layer. Nano Energy, 90. AMSTERDAM: ELSEVIER. ISSN 2211-3282

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Abstract

Tin (Sn) halide perovskite has been a promising candidate in lead-free perovskite solar cells (PSCs), but its chemical instability attributed to Sn2+/Sn4+ oxidation reduces device performance and stability. To address this problem, we propose a new approach, i.e. fabrication of mesoporous n-i-p Sn-based PSCs with the photoactive composite made of mixed-organic-cation Sn halide perovskite and reduced graphene oxide (rGO) sheets anchored with Sn quantum dots (i.e., FA0.8MA0.2SnI3/rGO-Sn QDs). The rGO-Sn QDs in active layer not only suppress the destructive Sn2+/Sn4+oxidation and recombination but also accelerate charge transport, improve charge-carrier lifetime and reduce trap state density. Compared to the power conversion efficiency (PCE) of SnPSC without Sn QDs, the composite-basted champion device showed 55% increase in efficiency, attributed to strong suppression of Sn2+/Sn4+oxidation and recombination. Furthermore, the champion device showed remarkable reproducibility and stability improvement, representing an essential step for the practical use of lowcost and lead-free PSCs.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Mahmoudi, Tahmineh UNSPECIFIED UNSPECIFIED UNSPECIFIED Rho, Won-Yeop UNSPECIFIED UNSPECIFIED UNSPECIFIED Kohan, Mohammadhosein UNSPECIFIED UNSPECIFIED UNSPECIFIED Im, Yeon Ho UNSPECIFIED UNSPECIFIED UNSPECIFIED Mathur, Sanjay UNSPECIFIED UNSPECIFIED UNSPECIFIED Hahn, Yoon-Bong UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-576053
DOI:	10.1016/j.nanoen.2021.106495
Journal or Publication Title:	Nano Energy
Volume:	90
Date:	2021
Publisher:	ELSEVIER
Place of Publication:	AMSTERDAM
ISSN:	2211-3282
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language HALIDE PEROVSKITES; LEAD; STABILITY; INTERFACE; ENHANCEMENT; PERFORMANCE; FABRICATION; EFFICIENCY; DEFECTS; CRYSTAL Multiple languages Chemistry, Physical; Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Physics, Applied Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/57605