Figure 7.

Structural characterization of the stretchable fiber‐shaped PSC. a) Perpendicularly aligned TiO₂ nanotubes, top view. b) PEDOT:PSS layer on the P3HT:PCBM layer that was coated on the TiO₂ nanotube array, top view. SEM image of c) the spring‐like modified Ti wire after coating of the PEDOT:PSS layer. d) Spring‐like Ti wire inserted with an elastic fiber. e) MWCNT sheet (inset: high magnification). f) Photograph of a fiber‐shaped PSC. g) Schematic illustration of the fabrication of a stretchable fiber‐shaped PSC. Reproduced with permission.63 Copyright 2015, Wiley‐VCH.