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a) Photograph images of binary and ternary blend films annealed at 120 °C at different time intervals. b) Schematic structure of spin and bar coated films. Temperature dependent solution UV–vis absorption spectra of c) binary and d) ternary blends. UV–vis absorption spectra of e) binary and f) ternary blend films annealed at 120 °C at different time intervals. g) Top view and h) schematic diagram of the sub‐module fabrication design (11 cells connected in series).
