Fiber-shaped dye-sensitized solar cells (FDSSCs) represent promising futuristic flexible or wearable power sources, owing to their simple fabrication process, light weight, weavability, and wearability. Along with strategies on changing the properties of semiconductor materials, the effects of incorporating silver-embedded SiO₂ nanoparticles (Ag@SiO₂ NPs) on the photoanodes of solid-state FDSSCs (SS-FDSSCs) are investigated. The power conversion efficiency (PCE) of SS-FDSSCs with Ag@SiO₂ NPs reaches 5.38%, which is comparable to the reference (3.98%). The PCEs remain at 95% between -16.9 and 91.7 °C, indicating the operational stability of SS-FDSSCs within this temperature range. The fabricated SS-FDSSCs, whose radii were 2 mm, maintains more than 90% of their efficiency over 500 bending cycles and 10 washing cycles.

Despite the excellent merits of lead perovskite solar cells, their instability and toxicity still present a bottleneck for practical applications. Bismuth perovskite has emerged as a candidate for photovoltaic (PV) applications, because it not only has a low toxicity but is also stable in air. However, the power conversion efficiency (PCE) remains an unsolved problem. We performed band gap tuning experiments to improve the efficiency. The absorption of ABi₃I₁₀ structure films was extended within the visible region, and the optical band gap was decreased considerably compared to that for Cs₃Bi₂I₉. Furthermore, we explained the correlation between the structure and the optical properties via a first-principles study. A device employing CsBi₃I₁₀ as a photoactive layer exhibits a PCE of 1.51% and an excellent ambient stability over 30 days.