Perovskite-CIGS tandem solar cell is 24.9% efficient

Swedish thin film solar cell company Midsummer has demonstrated a tandem thin-film solar cell that hits 24.9% efficiency. Midsummer makes CIGS (copper indium gallium selenide) solar cells, and it collaborated with University of California, Los Angeles and Pioneer Materials to stack a perovskite cell on top of one of its products to make the tandem ...

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