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a) Current–voltage response of an ITO/TiO2/CdS/Sb2S3/P3HT/PEDOT:PSS/Ag photovoltaic device under one sun equivalent of illumination; the inset shows the device architecture. b) Incident photon-to-current efficiency of an ITO/TiO2/CdS/Sb2S3/P3HT/PEDOT:PSS/Ag device.
