TY - JOUR
T1 - Chloride-Based Additive Engineering for Efficient and Stable Wide-Bandgap Perovskite Solar Cells
AU - Shen, Xinyi
AU - Gallant, Benjamin M.
AU - Holzhey, Philippe
AU - Smith, Joel A.
AU - Elmestekawy, Karim A.
AU - Yuan, Zhongcheng
AU - Rathnayake, P.V.G.M.
AU - Bernardi, Stefano
AU - Dasgupta, Akash
AU - Kasparavicius, Ernestas
AU - Malinauskas, Tadas
AU - Caprioglio, Pietro
AU - Shargaieva, Oleksandra
AU - Lin, Yen-Hung
AU - McCarthy, Melissa M.
AU - Unger, Eva
AU - Getautis, Vytautas
AU - Widner-Cooper, Asaph
AU - Herz, Laura M.
AU - Snaith, Henry J.
PY - 2023/7
Y1 - 2023/7
N2 - 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.
AB - 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.
KW - additive engineering
KW - crystallization mechanism
KW - halide homogenization
KW - perovskite solar cells
KW - suppressed halide segregation
U2 - 10.1002/adma.202211742
DO - 10.1002/adma.202211742
M3 - Article
SN - 0935-9648
VL - 35
JO - Advanced Materials
JF - Advanced Materials
IS - 30
M1 - 2211742
ER -