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. 2022 Jan 25;17:19. doi: 10.1186/s11671-021-03651-7

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Fig. 2 — a Optical absorption spectra of C₆₀ single layer (30 nm) and PTCDA:CuPc (30 nm) films deposited on C₆₀ film of different thicknesses. All films were deposited on quartz glasses. b XRD spectrum of PTCDA:CuPc films with and without C₆₀ film. And AFM images of c C₆₀/PTCDA:CuPc and d PTCDA:CuPc films