title: The synthesis and electrical characterization of Cu2O/Al:ZnO radial p-n junction nanowire arrays.
abstract: Vertically aligned large-area p-Cu(2)O/n-AZO (Al-doped ZnO) radial heterojunction nanowire arrays were synthesized on silicon without using catalysts in thermal chemical vapor deposition followed by e-beam evaporation. Scanning electron microscopy and high-resolution transmission electron microscopy results show that poly-crystalline Cu(2)O nano-shells with thicknesses around 10 nm conformably formed on the entire periphery of pre-grown Al:ZnO single-crystalline nanowires. The Al doping concentration in the Al:ZnO nanowires with diameters around 50 nm were determined to be around 1.19 at.% by electron energy loss spectroscopy. Room-temperature photoluminescence spectra show that the broad green bands of pristine ZnO nanowires were eliminated by capping with Cu(2)O nano-shells. The current-voltage (I-V) measurements show that the p-Cu(2)O/n-AZO nanodiodes have well-defined current rectifying behavior. This paper provides a simple method to fabricate superior p-n radial nanowire arrays for developing nano-pixel optoelectronic devices and solar cells.
authors.affiliation: Department of Materials Science and Engineering, National Cheng Kung University, Tainan 70101, Taiwan.
authors.forename: Chien-Lin
authors.initials: CL
authors.lastname: Kuo
authors.forename: Ruey-Chi
authors.initials: RC
authors.lastname: Wang
authors.forename: Jow-Lay
authors.initials: JL
authors.lastname: Huang
authors.forename: Chuan-Pu
authors.initials: CP
authors.lastname: Liu
authors.forename: Chun-Kai
authors.initials: CK
authors.lastname: Wang
authors.forename: Sheng-Po
authors.initials: SP
authors.lastname: Chang
authors.forename: Wen-Huei
authors.initials: WH
authors.lastname: Chu
authors.forename: Chao-Hung
authors.initials: CH
authors.lastname: Wang
authors.forename: Chia-Hao
authors.initials: CH
authors.lastname: Tu