title: Low-temperature-grown p-n ZnO nanojunction arrays as rapid and self-driven UV photodetectors.
abstract: In this study p-type ZnO nanorod (NR) arrays were grown using a low-temperature hydrothermal method in the presence of various concentrations of Sb in the doping solution. X-ray photoelectron spectroscopy revealed the atomic percentages and chemical states of the Sb dopant atoms in the p-type ZnO NR arrays. Photoluminescence and electrical measurements confirmed the p-type characteristics of the Sb-doped ZnO NR arrays. Sequential growth of n- and p-ZnO was then implemented to form p-n ZnO nanojunction arrays. The photovoltaic properties of the p-n ZnO nanojunction devices were investigated under 365 nm UV light; the short-circuit current densities and open-circuit voltages exhibited linear and logarithmic dependence, respectively, on the power density of the UV light. In addition, the p-n ZnO nanojunction devices displayed a rapid response to UV light at zero bias, with a linear correlation between the responsivity and the incident light power. Such low-temperature growth of p-n ZnO nanojunctions appears to be a facile strategy for fabricating junctioned nanostructures with applications in energy-harvesting and self-driven photodetecting optoelectronics.
authors.affiliation: Department of Materials Science and Engineering, National Tsing Hua University, Hsinchu 300, Taiwan. mylu@mx.nthu.edu.tw.
authors.forename: Ming-Yen
authors.initials: MY
authors.lastname: Lu
authors.affiliation: Graduate Institute of Opto-Mechatronics, National Chung Cheng University, Chia-Yi 62102, Taiwan.
authors.forename: Hung-Yi
authors.initials: HY
authors.lastname: Chen
authors.affiliation: Graduate Institute of Opto-Mechatronics, National Chung Cheng University, Chia-Yi 62102, Taiwan.
authors.forename: Cheng-Yu
authors.initials: CY
authors.lastname: Tsai
authors.affiliation: Graduate Institute of Opto-Mechatronics, National Chung Cheng University, Chia-Yi 62102, Taiwan.
authors.forename: Yen-Ti
authors.initials: YT
authors.lastname: Tseng
authors.affiliation: Department of Physics, National Chung Cheng University, Chia-Yi 62102, Taiwan.
authors.forename: Yu-Ting
authors.initials: YT
authors.lastname: Kuo
authors.affiliation: Graduate Institute of Opto-Mechatronics, National Chung Cheng University, Chia-Yi 62102, Taiwan.
authors.forename: Hsiang-Chen
authors.initials: HC
authors.lastname: Wang
authors.affiliation: National Nano Device Laboratories, Hsinchu 300, Taiwan.
authors.forename: Ming-Pei
authors.initials: MP
authors.lastname: Lu