Proceedings of Materials for Sustainable Development Conference (MAT-SUS) (NFM22)
DOI: https://doi.org/10.29363/nanoge.nfm.2022.122
Publication date: 11th July 2022
Replacing toxic Pb2+ cations in halide perovskites is one of the major challenges to make this technology viable for its widespread implementation. A lot of effort has been, and still is, focused on finding alternative B2+ cations such as Sn2+ or combinations of B+ and B3+ cations such as in Cs2Ag+Bi3+X6 double perovskites.
Nevertheless, there exists another option that has been so far mostly overlooked which consists in ABX3 compounds that are isostructural to perovskites but with opposite charges: A-B2-X+3. These compounds are named antiperovskites and several of them have been already demonstrated experimentally.
Here, I will focus on Ag3SX (X=I or Br), which can also be written as XSAg3 to highlight the analogy with perovskites. I will show how these antiperovskites can be synthesized by simple and dry methods based on mechanochemistry and moderate thermal annealing. Based on the nature of the X halide, the optical absorption within the visible range can be tuned which makes these semiconductors especially relevant for photovoltaics.
Thin films have also been deposited by pulsed laser deposition, paving the way to the implementation of these antiperovskites in solar cells.
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