Figure 4.

Folding durability of the SWNT–PI‐based ultrathin PSC. a) 3D illustration of the foldable PSCs fabricated in this work. b) Bending durability of the MoO_x/SWNT–PI‐based device (R _bending 1 mm) and ITO/PEN‐based device (R _bending 4 mm) under different bending radii, c) folding durability of the MoO_x/SWNT–PI‐based device (R _folding 0.5 mm), d) maximum power point tracking data of the MoO_x/SWNT–PI device obtained under one‐sun illumination (100 mW cm⁻²), and e) long‐term stability of the device stored in a nitrogen‐filled glove box under dark condition at room temperature (≈25 °C).