Abstract
In this study, the ultraviolet (UV) photodiodes with homogeneous zinc oxide (ZnO) nanorods (NRs) were investigated. The lithium (Li) doped ZnO NRs were synthesized on a indium tin oxide glass substrate via a hydrothermal method, the samples showed stable homostructures and characteristics as p-type Li–ZnO NRs. Then, the p-type NRs were stacked onto an n-type aluminum zinc oxide film to form a p–n homojunction and reduced the lattice mismatch of the photodiodes. Three different sizes of the fabricated homostructured photodiodes (0.5 × 0.5, 0.75 × 0.75, and 1 × 1 mm2) each doped with 0.01 M Li were examined for their photo-electronic properties. Under a 380 nm UV illumination and 5 V applied bias, the results showed that the photoresponsivities (A/W) of the three photodiodes were 21.34, 27.94, and 34.87, respectively. In addition, the device having a 1 × 1 mm2 area produced a significantly better photovoltaic property.
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