Tandem-junction microwire array photoelectrodes have been fabricated by coating np + -Si radial homojunction microwire arrays sequentially with fluorine-doped tin oxide (FTO) and titanium dioxide (TiO 2 ). These photoelectrodes effected unassisted water splitting under simulated 1 Sun conditions with an open-circuit potential ( E oc ) of −1.5 V vs the formal potential for oxygen evolution, E 0 ' (OH − /O 2 ), a current density at E = E 0 ' (OH − /O 2 ) of 0.78 mA cm −2 , a fill factor ( ff ) = 0.51, and a photovoltaic-biased photoelectrochemical ideal regenerative cell efficiency of 0.6%.
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Shaner et al. (2016) studied this question.
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