Abstract
We report a high efficiency water splitting photoelectrochemical cell based on 3D branched nanowire (NW) heterostructures photoelectrodes. The 3D NW heterostructure is composed of an n-Si NW core and ZnO NW branches and fabricated from cost-effective low temperature solution-based synthesis methods. Specifically, we report the studies of 3D n-n NW heterojunction photoelectrode efficiency (photocurrent) dependence on the core and branch NW length, where longer Si NW cores give a larger anodic photocurrent response as well as a recombination current, and longer ZnO NW branches increase the cathodic photocurrent response and the dark current.
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