Fig. 4.

a Energy level diagram and b device structure of FPSCs based on PET/AgNWs/ATO substrate and carbon back electrode.

Reproduced with permission from Ref. [41]. Copyright 2020, Elsevier. SEM images and schematic diagrams of different AgNWs/PEDOT:PSS composite electrodes c without and d with planarization layer. Reproduced with permission from Ref. [108]. Copyright 2017, John Wiley and Sons. e Schematic illustration of the procedures in fabricating composite PET/graphene/AgNWs electrode. Reproduced with permission from Ref. [110]. Copyright 2016, American Chemical Society. f Schematic of fabricating orthogonal AgNWs via capillary printing and g the optical transmittance of orthogonal AgNWs/glass compared with random AgNWs/glass. f Reproduced with permission from Ref. [118]. Copyright 2015, American Chemical Society. g Reproduced with permission from Ref. [8]. Copyright 2019, Royal Society of Chemistry