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a) J–V curves of perovskite solar cells employing NiO NCs (20 nm, 40 nm and 70 nm), thin film and organic PEDOT: PSS as HTMs. b) Corresponding IPCE spectra of NiO NCs (20 nm, 40 nm and 70 nm), thin film and organic PEDOT: PSS‐based perovskite solar cells. Reproduced with permission.62
