Abstract
We report on an all chemical bath deposition (CBD) fabrication of self-assembled vertically aligned heteroepitaxy grown (002)ZnO//(002)CdS ZnO/CdS core/shell nanorod (NR) arrays. These single-technique processed NR arrays comprising of CdS QDs conformally and epitaxially grown on faceted single-crystalline ZnO NRs achieve effective charge separation and collection, resulting from visible light driven highest ever, reported photocurrent density without any postdeposition process step, unlike previous such studies. The low ion-flux controlled ion-by-ion deposition induces chemical-epitaxy growth mechanism, with a 38° tilt of CdS c-axis. Structural characterizations confirm the homogeneous growth of (002) CdS QDs (size ∼30 nm) on hexagonal prismaticc-axis oriented ZnO NRs (400 nm diameter). Compared with pristine ZnO NR array, a 20-fold enhancement in photocurrent density (∼8.5 mA/cm2 at +1.0 V vs Ag/AgCl) under AM1.5 light illumination is observed without any additional passivation/sensitization layer, attr...
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