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 Kasparavičius; Tadas Malinauskas; Pietro Caprioglio; Oleksandra Shargaieva; Yen‐Hung Lin; M. McCarthy; Eva Unger; Vytautas Getautis; Asaph Widmer‐Cooper; Laura M. Herz; Henry J. Snaith · 2023 · Advanced Materials
Paper
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 realizing efficient and stable perovskite tandem cells. Here, a holistic approach to overcoming challenges in 1.8 eV perovskite solar cells is reported by engineering the perovskite crystallization pathway by means of chloride additives. In conjunction with employing a self-assembled monolayer as the hole-transport layer, an open-circuit voltage of 1.25 V and a power conversion efficiency of 17.0% are achieved. The key role of methylammonium chloride addition is elucidated in facilitating the growth of a chloride-rich intermediate phase that directs crystallization of the desired cubic perovskite phase and induces more effective halide homogenization. The as-formed 1.8 eV perovskite demonstrates suppressed halide segregation and improved optoelectronic properties.
Analysis
This paper reports a method using chloride additives to improve the efficiency and stability of wide-bandgap perovskite solar cells, crucial for tandem applications.
Discovery
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