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Device analysis. a) Temperature‐dependent V OC, and b) J SC versus light intensity, and c) V OC decay curves, and d) C −2–V curves, and e) J–V curves under dark conditions of Sb2Se3 devices with and without t‐Se layer, respectively. f) Long‐term stability of Sb2Se3 devices with t‐Se layer and with Spiro‐OMeTAD layer.
