Traditional silicon solar panels may soon be outperformed by the emerging technology of perovskite solar cells, with certain metal halide perovskites cells having efficiencies of up to 24%. Initial research focused on lead-based perovskites, however high toxicity and long-term instability of crystals created challenges in application. Due to lead’s detriment to humans and the environment, bismuth is a favorable alternative in perovskite nanocrystals. In this work, our group conducted an experimental investigation of the optical properties of two bismuth-based perovskites, dihydrogen-4,4-bipyridine bismuth iodide ((H2bpy)2[Bi2I10 ]) and hydrogen-2,9-dimethyl-1,10-phenanthroline bismuth iodide((Hdmphen)3[Bi2I9]). Spectroscopic analysis of both compounds indicate the energetic characteristics of the perovskites, allowing for fine tuning and application in photovoltaics. The efficiency of the bismuth compounds was also compared to standard lead halide perovskites. Future work will focus on the characterization of the energies and excited state lifetimes of these bismuth-based perovskites.

Preliminary study of bismuth-based perovskite crystals as an alternative for lead halide perovskites in solar energy applications

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