High
performance and robustness are the key factors to boosting
wearable and portable applications. Although the 1D crystal structure
makes the Sb2Se3 thin film more tolerant to
physical deformation upon bending, the conventional planar structures
still cannot undergo repeated mechanical bending due to the induced
stress/strain inside devices, which can be well addressed by constructing
three-dimensional nanostructures. Besides, the electron diffusion
length has two values, 0.3 μm in the [221] direction and 1.7
μm in the [001] direction, in the Sb2Se3 thin film, which limits the absorber thickness, for getting an effective
carrier collection; thus, a strong light trapping effect enabling
sufficient light harvesting is needed to allow the use of a very thin
light absorption layer. Herein, the nanoconed Sb2Se3 solar cells have been designed, and their light absorption
behaviors were investigated within a finite-element simulation under
the substrate back-reflection, indicating that the reflection of the
bottom part always works positively, while the effect of the nanocone
sidewall on absorption enhancement largely depends on its geometry,
arising from resonant or scattering modes. These results provide a
practical guide in designing/establishing an easier/simpler way to
fabricate high-performance and mechanically stable flexible nanostructured
Sb2Se3 thin film solar cells.