title: Catalyst-Free, Selective Growth of ZnO Nanowires on SiO2 by Chemical Vapor Deposition for Transfer-Free Fabrication of UV Photodetectors.
abstract: Catalyst-free, selective growth of ZnO nanowires directly on the commonly used dielectric SiO2 layer is of both scientific significance and application importance, yet it is still a challenge. Here, we report a facile method to grow single-crystal ZnO nanowires on a large scale directly on SiO2/Si substrate through vapor-solid mechanism without using any predeposited metal catalyst or seed layer. We found that a rough SiO2/Si substrate surface created by the reactive ion etching is critical for ZnO growth without using catalyst. ZnO nanowire array exclusively grows in area etched by the reactive ion etching method. The advantages of this method include facile and safe roughness-assisted catalyst-free growth of ZnO nanowires on SiO2/Si substrate and the subsequent transfer-free fabrication of electronic or optoelectronic devices. The ZnO nanowire UV photodetector fabricated by a transfer-free process presented high performance in responsivity, quantum efficiency and response speed, even without any post-treatments. The strategy shown here would greatly reduce the complexity in nanodevice fabrication and give an impetus to the application of ZnO nanowires in nanoelectronics and optoelectronics.
authors: School of Electronics and Information Engineering, Changchun University of Science and Technology , 7089 Weixing Road, Changchun, Jilin 130022, People's Republic of China.|Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences , Chongqing, 400714, People's Republic of China.|Chongqing Key Laboratory of Multi-scale Manufacturing Technology, Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences , Chongqing 400714, People's Republic of China.
authors: Liping
authors: L
authors: Xu
authors: Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences , Chongqing, 400714, People's Republic of China.|Chongqing Key Laboratory of Multi-scale Manufacturing Technology, Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences , Chongqing 400714, People's Republic of China.
authors: Xin
authors: X
authors: Li
authors: Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences , Chongqing, 400714, People's Republic of China.|Chongqing Key Laboratory of Multi-scale Manufacturing Technology, Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences , Chongqing 400714, People's Republic of China.
authors: Zhaoyao
authors: Z
authors: Zhan
authors: Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences , Chongqing, 400714, People's Republic of China.|Chongqing Key Laboratory of Multi-scale Manufacturing Technology, Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences , Chongqing 400714, People's Republic of China.
authors: Liang
authors: L
authors: Wang
authors: Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences , Chongqing, 400714, People's Republic of China.|Chongqing Key Laboratory of Multi-scale Manufacturing Technology, Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences , Chongqing 400714, People's Republic of China.
authors: Shuanglong
authors: S
authors: Feng
authors: School of Electronics and Information Engineering, Changchun University of Science and Technology , 7089 Weixing Road, Changchun, Jilin 130022, People's Republic of China.
authors: Xiangyu
authors: X
authors: Chai
authors: Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences , Chongqing, 400714, People's Republic of China.|Chongqing Key Laboratory of Multi-scale Manufacturing Technology, Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences , Chongqing 400714, People's Republic of China.
authors: Wenqiang
authors: W
authors: Lu
authors: Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences , Chongqing, 400714, People's Republic of China.|Chongqing Key Laboratory of Multi-scale Manufacturing Technology, Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences , Chongqing 400714, People's Republic of China.
authors: Jun
authors: J
authors: Shen
authors: School of Electronics and Information Engineering, Changchun University of Science and Technology , 7089 Weixing Road, Changchun, Jilin 130022, People's Republic of China.
authors: Zhankun
authors: Z
authors: Weng
authors: College of Electronic Information and Control Engineering, Beijing University of Technology , 100 Ping Le Yuan, Chaoyang District, Beijing 100124, People's Republic of China.
authors: Jie
authors: J
authors: Sun
keywords: UV photodetector; ZnO nanowires; catalyst-free; transfer-free