Proceedings of MATSUS Spring 2025 Conference (MATSUSSpring25)
DOI: https://doi.org/10.29363/nanoge.matsusspring.2025.223
Publication date: 16th December 2024
Despite its great potential, lead halide perovskite technology draws major scepticism from supporters of established optoelectronic technologies due to long-term stability and environmental compatibility issues. One of the suggested solutions in literature is the large family of non-conventional (other than CIGS and CdTe), defect-tolerant, non-toxic chalcogenide compounds which possess desirable optical band gaps in the visible range. However, the fabrication of highly-efficient photovoltaic devices is still challenging, as there is a clear gap in efficiency between metal halide and chalcogenide-based materials.
Here we present our efforts to fabricate thin films of acceptable optoelectronic properties and then build operational devices, where possible. We focus our experiments only on solution-processing methods, working on semiconductors at the nano- or poly-crystalline scale. We deal with compounds which have cubic crystal structure, such as AgBiS2, possessing 3D electron dimensionality and, thus, can work as effective absorbers in around 2% efficient photovoltaics. On the other hand, few of those materials can also present strong radiative recombination (PbS and CuInS2) and may act equally well as emitters in solar cells and LEDs. There are also cases where sulfides (or selenides) with lower dimensionality (such as Sb2S3) are adopted with very promising results (PCEs of over 5%). Additionally, we are also targeting at chalcogenide semiconductors which crystallize in the perovskite structure and are able to fabricate proof-of-concept liquid solar cells based on BaZrS3-modified TiO2 photoelectrodes [1]. Our ultimate goal is to replace Ba2+ with a di-protonated amine and fabricate, for the first time in literature, hybrid inorganic-organic chalcogenide perovskites.
We acknowledge the financial support from the European Research Council (ERC) through Consolidator Grant (818615-MIX2FIX).
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