Chloride-based additive engineering for efficient and stable wide-bandgap perovskite solar cells /

Xinyi Shen; Benjamin M Gallant; Philippe Holzhey; Joel A Smith; Karim A Elmestekawy; Zhongcheng Yuan; P.V.G.M Rathnayake; Stefano Bernardi; Akash Dasgupta; Ernestas Kasparavicius; Tadas Malinauskas; Pietro Caprioglio; Oleksandra Shargaieva; Yen-Hung Lin; Melissa M McCarthy; Eva Unger; Vytautas Getautis; Asaph Widmer-Cooper; Laura M Herz; Henry J Snaith

doi:10.1002/adma.202211742

Title	Chloride-based additive engineering for efficient and stable wide-bandgap perovskite solar cells /
Authors	Shen, Xinyi ; Gallant, Benjamin M ; Holzhey, Philippe ; Smith, Joel A ; Elmestekawy, Karim A ; Yuan, Zhongcheng ; Rathnayake, P.V.G.M ; Bernardi, Stefano ; Dasgupta, Akash ; Kasparavicius, Ernestas ; Malinauskas, Tadas ; Caprioglio, Pietro ; Shargaieva, Oleksandra ; Lin, Yen-Hung ; McCarthy, Melissa M ; Unger, Eva ; Getautis, Vytautas ; Widmer-Cooper, Asaph ; Herz, Laura M ; Snaith, Henry J
DOI	10.1002/adma.202211742
Full Text
Is Part of	Advanced materials.. Weinheim : Wiley-VCH. 2023, vol. 35, iss. 30, art. no. 2211742, p. 1-11.. ISSN 0935-9648. eISSN 1521-4095
Keywords [eng]	perovskite solar cells ; additive engineering ; crystallisation mechanism ; halide homogenisation ; suppressed halide segregation
Abstract [eng]	Metal halide perovskite-based tandem solar cells are promising to achieve power conversion efficiency beyond the theoretical limit of their single-junction counterparts. However, overcoming the significant open-circuit voltage deficit present in wide-bandgap perovskite solar cells remains a major hurdle for realising efficient and stable perovskite tandem cells. Here, we report a holistic approach to overcoming challenges in 1.8 eV perovskites solar cells by engineering the perovskite crystallisation pathway by means of chloride additives. In conjunction with employing a self-assembled monolayer as the hole transport layer, we achieved an open-circuit voltage of 1.25 V and a power conversion efficiency of 17.0%. We elucidate the key role of methylammonium chloride addition in facilitating the growth of a chloride-rich intermediate phase that directs crystallisation of the desired cubic perovskite phase, and induce more effective halide homogenisation. The as-formed 1.8 eV perovskite demonstrates suppressed halide segregation and improved optoelectronic properties. This article is protected by copyright. All rights reserved.
Published	Weinheim : Wiley-VCH
Type	Journal article
Language	English
Publication date	2023
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„Chloride-based additive engineering for efficient and stable wide-bandgap perovskite solar cells /“