Bumpy Au interdigital electrodes deposited on flexible porous PET substrates were used as the electrodes. Then, the PS nanospheres were conformally coated on the plasma-treated Au electrodes and PET substrates, forming hierarchical nanostructured surfaces. After that, the conformal nanosphere-coated surface was sputtered with a thin Au coating to improve the conductive network. Then, a plasma treatment of the Au-coated surfaces was carried out to enhance the adhesion between WS2 sheets and the nanostructured surfaces. Finally, WS2 suspension with a concentration of 1 mg/mL was directly dropped onto the conformal nanosphere-coated surfaces, leading to the formation of WS2-decorated nanosphere arrays with enhanced light-harvesting capability.

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