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Antimony-based perovskite for low-toxicity photovoltaics

A research team led by Prof. Pecunia has synthesised novel two-dimensional all-inorganic antimony-based perovskites, Cs3Sb2ClxI9-x. By demonstrating their cutting-edge photoconversion and photovoltaic efficiencies, this study points to the significant potential of all-inorganic two-dimensional antimony-based perovskites for optoelectronics and energy applications.

Lead-free metal-halide perovskites represent an emerging class of materials widely recognised as having considerable potential for green photovoltaics and optoelectronics. In this paper, we investigated one promising material system of this class, i.e., all-inorganic cesium-antimony halides. Through halide mixing, we demonstrated a low-temperature solution-based route to its crystallographic conversion into a two-dimensional phase. Embedded within sandwich-type devices, the newly-synthesised materials delivered an external quantum efficiency up to 62.5%—a large improvement over prior reports on related antimony-based materials as well as bismuth-based analogues—along with a considerable enhancement in photovoltaic efficiency. Additionally, detailed experimental characterisation allowed us to rationalise the photoconversion efficiency boost in relation to crystallographic and charge transport properties.

The structural manipulation via composition engineering and the photoconversion efficiency boost reported by this study provide insight into the status and prospects of two-dimensional all-inorganic antimony- and bismuth-based halide perovskites. Therefore, this study will be beneficial to the further exploration of these materials for lead-free optoelectronics and photovoltaics (e.g., top cells in tandem photovoltaics and building-integrated photovoltaics).

This work has been published in the journal Applied Materials Today.

Reference
Y. Peng*, F. Li, Y. Wang, Y. Li, R. L.Z. Hoye, L. Feng, K. Xia, V. Pecunia†*, “Enhanced photoconversion efficiency in cesium-antimony-halide perovskite derivatives by tuning crystallographic dimensionality”, Applied Materials Today, 19, 100637, 2020. DOI: 10.1016/j.apmt.2020.100637


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