title: Growth and Photovoltaic Properties of High-Quality GaAs Nanowires Prepared by the Two-Source CVD Method.
abstract: Growing high-quality and low-cost GaAs nanowires (NWs) as well as fabricating high-performance NW solar cells by facile means is an important development towards the cost-effective next-generation photovoltaics. In this work, highly crystalline, dense, and long GaAs NWs are successfully synthesized using a two-source method on non-crystalline SiO2 substrates by a simple solid-source chemical vapor deposition method. The high V/III ratio and precursor concentration enabled by this two-source configuration can significantly benefit the NW growth and suppress the crystal defect formation as compared with the conventional one-source system. Since less NW crystal defects would contribute fewer electrons being trapped by the surface oxides, the p-type conductivity is then greatly enhanced as revealed by the electrical characterization of fabricated NW devices. Furthermore, the individual single NW and high-density NW parallel arrays achieved by contact printing can be effectively fabricated into Schottky barrier solar cells simply by employing asymmetric Ni-Al contacts, along with an open circuit voltage of ~0.3 V. All these results indicate the technological promise of these high-quality two-source grown GaAs NWs, especially for the realization of facile Schottky solar cells utilizing the asymmetric Ni-Al contact.
authors.affiliation: State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing, 100190, China.|Center for Excellence in Urban Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen, 361021, China.
authors.forename: Ying
authors.initials: Y
authors.lastname: Wang
authors.affiliation: Department of Physics and Materials Science, City University of Hong Kong, Kowloon, Hong Kong.|State Key Laboratory of Millimeter Waves, City University of Hong Kong, Kowloon, Hong Kong.|Shenzhen Research Institute, City University of Hong Kong, Shenzhen, 518057, China.
authors.forename: Zaixing
authors.initials: Z
authors.lastname: Yang
authors.affiliation: State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing, 100190, China.|Center for Excellence in Urban Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen, 361021, China.
authors.forename: Xiaofeng
authors.initials: X
authors.lastname: Wu
authors.affiliation: State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing, 100190, China. nhan@ipe.ac.cn.|Center for Excellence in Urban Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen, 361021, China. nhan@ipe.ac.cn.
authors.forename: Ning
authors.initials: N
authors.lastname: Han
authors.affiliation: Beijing National Day School, Beijing, 100039, China.
authors.forename: Hanyu
authors.initials: H
authors.lastname: Liu
authors.affiliation: Beijing National Day School, Beijing, 100039, China.
authors.forename: Shuobo
authors.initials: S
authors.lastname: Wang
authors.affiliation: Beijing National Day School, Beijing, 100039, China.
authors.forename: Jun
authors.initials: J
authors.lastname: Li
authors.affiliation: Department of Physics and Materials Science, City University of Hong Kong, Kowloon, Hong Kong.
authors.forename: WaiMan
authors.initials: W
authors.lastname: Tse
authors.affiliation: Department of Physics and Materials Science, City University of Hong Kong, Kowloon, Hong Kong.|State Key Laboratory of Millimeter Waves, City University of Hong Kong, Kowloon, Hong Kong.|Shenzhen Research Institute, City University of Hong Kong, Shenzhen, 518057, China.
authors.forename: SenPo
authors.initials: S
authors.lastname: Yip
authors.affiliation: State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing, 100190, China.|Center for Excellence in Urban Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen, 361021, China.
authors.forename: Yunfa
authors.initials: Y
authors.lastname: Chen
authors.affiliation: Department of Physics and Materials Science, City University of Hong Kong, Kowloon, Hong Kong. johnnyho@cityu.edu.hk.|State Key Laboratory of Millimeter Waves, City University of Hong Kong, Kowloon, Hong Kong. johnnyho@cityu.edu.hk.|Shenzhen Research Institute, City University of Hong Kong, Shenzhen, 518057, China. johnnyho@cityu.edu.hk.
authors.forename: Johnny C
authors.initials: JC
authors.lastname: Ho
keywords: Chemical vapor deposition; Contact printing; GaAs; Nanowire parallel arrays; Schottky solar cells; Two-source