Reducing halide segregation in wide-bandgap mixed-halide perovskite solar cells using redox mediators
Multi-junction solar cells, solar cells comprised of many individual semiconductor junctions stacked together, have the potential of outperforming single-junction solar cells both in terms of efficiency and stability. In recent years, material scientists and engineers have been trying to identify viable material combinations for fabricating these solar cells. A class of materials found to be promising for these applications is metal halide perovskites, semiconductors with inherent properties that are advantageous for developing various optoelectronic devices and photovoltaics. While the efficiency of tandem solar cells based on these semiconductors has gradually improved and recently reached 24%, their stability is hindered by the severe phase segregation of mixed-halide perovskites. Researchers at City University of Hong Kong recently set out to address this limitation of mixed-halide perovskite solar cells. Their paper, published in Nature Energy, introduces a strategy that could improve the long-term stability and photovoltage of these solar cells, utilizing newly designed redox mediators based on anthraquinone compounds.
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