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We have engineered the electronic structure at the interface between Cu 2 O and ZnO nanorods (NRs) array, through adjusting the carrier concentration of Cu 2 O. The electrodeposition of Cu 2 O at pH 11 acquired the highest carrier concentration, resulting in the largest interfacial electric field between Cu 2 O and ZnO, which finally led to the highest separation efficiency of photogenerated charge carriers. The optimized Cu 2 O/ZnO NRs array p-n heterostructures exhibited enhanced PEC performance, such as elevated photocurrent and photoconversion efficiency, as well as excellent sensing performance for the sensitive detection of glutathione (GSH) in PBS buffer even at applied bias of 0 V which made the device self-powered. Besides, the favorable selectivity, high reproducibility and extremely wide detection range, make such heterostructure a promising candidate for PEC biosensing applications, probably for the extended field of PEC water splitting or other solar photovoltaic beacons.

scientific reports

Electronic Structure Engineering of Cu2O Film/ZnO Nanorods Array All-Oxide p-n Heterostructure for Enhanced Photoelectrochemical Property and Self-powered Biosensing Application