Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV19)
DOI: https://doi.org/10.29363/nanoge.hopv.2020.044
Publication date: 6th February 2020
Lead-based perovskites, APbX3, achieved over 23 % of efficiency within only 7 years after first their usage in solar cells. Although these lead-based perovskites have rapidly achieved the high efficiency, they have two intrinsic problems to be addressed to be commercialised; toxicity and instability. To address the problems of lead at the same time, new lead-free and air-stable perovskites such as bismuth- or antimony-based perovskites are emerging. However, the efficiency of the solar cells employing these new materials is relatively low below 5% with intrinsic problems; large binding energy, high defect, and large band gap.[1-4]
Recently, it was reported that 10 times higher photo luminescence quantum yield (PLQY) was achieved by 7% of tin substitution on lead-based perovskite.[5] The reason for this improvement is not clear yet but we expect the similar effect can be brought when bismuth and antimony are mixed in a perovskite structure because the relationship between lead and tin is like that between bismuth and antimony. In a report, the improvement in defect density and varied defect states with the ratio of bismuth in the antimony perovskite, leading to doubled solar cell performance.[6]
In this talk, we will present some of our results from the investigation on the bismuth and antimony mixed perovskites in (MA)3(BixSb1-x)2I9 structure. In particular, we will focus on the changes in structure and electronic and opto-electronic properties as changing the ratio of two atoms in the 0D perovskites by both experimental and theoretical methods.
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International Conference on Hybrid and Organic Photovoltaics (HOPV) is celebrated yearly in May. The main topics are the development, function and modeling of materials and devices for hybrid and organic solar cells. The field is now dominated by perovskite solar cells but also other hybrid technologies, as organic solar cells, quantum dot solar cells, and dye-sensitized solar cells and their integration into devices for photoelectrochemical solar fuel production.
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