Channeling of electron transport to improve collection efficiency in mesoporous titanium dioxide dye sensitized solar cell stacks

摘要

Dye-sensitized solar cell (DSC) modules are generally made by interconnecting large photoelectrode strips with optimized thickness (～14 μm) and show lower current density (J_(SC)) compared with their single cells. We found out that the key to achieving higher J_(SC) in large area devices is optimized photoelectrode volume (V_D), viz., thickness and area which facilitate the electron channeling towards working electrode. By imposing constraints on electronic path in a DSC stack, we achieved ＞ 50% increased J_(SC) and ～60% increment in photoelectric conversion efficiency in photoelectrodes of similar V_D (～3.36 × 10~(-4) cm~3) without using any metallic grid or a special interconnections.