Fig. 5: Flexible ZrO₂/SnO₂ TFTs.

a Schematics of the fabricated ZrO₂/SnO₂ TFTs on PI substrates. b Optical images of flexible ZrO₂/SnO₂ TFTs. c Optical images of flexible TFTs in the bending state for mechanical stress testing. Optical microscopy images of flexible TFTs with different L: (d) 100, (e) 50, and (f) 20 μm, while maintaining a constant W/L ratio.