Integrating Light Diffusion and Conversion Layers for Highly Efficient Multicolored Fiber Dye-Sensitized Solar Cells.

Fiber solar cells as promising wearable power supplies have attracted increasing attentions recently, while further breakthrough on their power conversion efficiency (PCE) and realization of multicolored appearances remain urgent needs particularly in real-world applications. Here we design a fiber dye-sensitized solar cell (FDSSC) integrated with a light diffusion layer composed of alumina/polyurethane film on the outmost encapsulating tube and a light conversion layer made from phosphors/TiO 2 /poly(vinylidene fluoride-co-hexafluoropropylene) film on the inner counter electrode. The incident light was diffused to more surfaces of fiber electrodes, then converted on counter electrode and reflected to neighboring photoanode, so the FDSSC efficiently took advantage of the fiber shape for remarkably enhanced light harvesting, producing a record PCE of 13.11%. These efficient FDSSCs also realized color-tunable appearances, improving their designability and compatibility with textiles. They were further integrated with fiber batteries as power systems, providing a power solution for wearables and emerging smart textiles. This article is protected by copyright. All rights reserved.