title: Selective growth of ZnO nanorods on hydrophobic Si nanorod arrays.
abstract: In this paper we describe the selective growth of ZnO nanorods (NRs) on top of hydrophobic Si NR arrays. The periodic Si NR arrays, prepared through electroless chemical etching and HF treatment, functioned as hydrophobic substrates. Droplets containing ZnO seeds could be positioned on the Si NR arrays, causing the ZnO seeds to deposit selectively upon them, with n-ZnO NR/p-Si NR array heterojunctions ultimately forming after hydrothermal growth of ZnO NRs. Because of compensation for the difference in refractive index between air and the Si substrate, the n-ZnO NR/p-Si NR arrays exhibited excellent absorption ability in the visible range. Devices based on these n-ZnO NR/p-Si NR array heterojunctions displayed not only rectifying behavior but also photovoltaic effects when illuminated with UV light. The low temperature and low cost of this fabrication process suggest that the selective growth of n-ZnO NRs on p-Si NR arrays might allow such structures to have diverse applications in optoelectronics.
authors.affiliation: Graduate Institute of Opto-Mechatronics, National Chung Cheng University, Chia-yi 62102, Taiwan. Advanced Institute of Manufacturing with High-Tech Innovations, National Chung Cheng University, Chia-yi 62102, Taiwan.
authors.forename: Ming-Yen
authors.initials: MY
authors.lastname: Lu
authors.forename: Ying-Jhe
authors.initials: YJ
authors.lastname: Wang
authors.forename: Meng-Hsiang
authors.initials: MH
authors.lastname: Hong
authors.forename: Cheng-Yao
authors.initials: CY
authors.lastname: Chiu
authors.forename: Shuen-Jium
authors.initials: SJ
authors.lastname: You
authors.forename: Ming-Pei
authors.initials: MP
authors.lastname: Lu