Cl-Doped
ZnO Nanowires with Metallic Conductivity and Their Application for
High-Performance Photoelectrochemical Electrodes
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Abstract
Doping
semiconductor nanowires (NWs) for altering their electrical and optical
properties is a critical strategy for tailoring the performance of
nanodevices. ZnO NWs grown by hydrothermal method are pervasively
used in optoelectronic, photovoltaic, and piezoelectric energy-harvesting
devices. We synthesized in situ Cl-doped ZnO NWs with metallic conductivity
that would fit seamlessly with these devices and improve their performance.
Possible Cl doping mechanisms were discussed. UV–visible absorption
spectroscopy confirmed the visible light transparency of Cl-doped
ZnO NWs. Cl-doped ZnO NW/TiO<sub>2</sub> core/shell-structured photoelectrochemical
(PEC) anode was fabricated to demonstrate the application potential
of highly conductive ZnO NWs. Higher photocurrent density and overall
PEC efficiency compared with the undoped ZnO NW-based device were
achieved. The successful doping and low resistivity of ZnO could unlock
the potential of ZnO NWs for applications in low-cost flexible transparent
electrodes