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a) Device structure of the flexible inverted OSCs. b) Energy levels of the materials in the device. c) Cross‐sectional SEM images of inverted OSCs. Scale bar: 1.0 µm. d) Transmittance spectra of the samples including PET, PET/Ag‐grid, PET/Ag‐grid/PH1000, and PET/Ag‐grid/PH1000/ZnO/PFN films. Reproduced with permission.180 Copyright 2014, Elsevier.
