Optimization and Stabilization of Electrodeposited
Cu<sub>2</sub>ZnSnS<sub>4</sub> Photocathodes for Solar Water Reduction
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Abstract
Cu<sub>2</sub>ZnSnS<sub>4</sub> (CZTS)
is a promising p-type semiconductor that has not yet been extensively
investigated for solar fuel production via water splitting. Here,
we optimize and compare two different electrodeposition routes (simultaneous
and sequential) for preparing CZTS electrodes. More consistent results
are observed with the simultaneous route. In addition, the effect
of etching and the presence of a CdS buffer layer on the photocurrent
are investigated. Finally, we demonstrate for the first time the stabilization
of these electrodes using protecting overlayers deposited by atomic
layer deposition (ALD). Our best performing protected electrodes (Mo/CZTS/CdS/AZO/TiO<sub>2</sub>/Pt) exhibited a photocurrent of over 1 mA cm<sup>β2</sup> under standard one sun illumination conditions and a significant
improvement in stability over unprotected electrodes