title: Electronic structures of well-aligned Er-doped ZnO nanorod arrays.
abstract: Electronic structures of well-aligned Er-doped ZnO (ZnO:Er) nanorod arrays (NRAs) synthesized by a solution-based hydrothermal process were characterized by high-resolution transmission electron microscopy (HRTEM) and X-ray absorption fine structure (XAFS). HRTEM and angular dependent X-ray absorption near-edge structure analysis at O K and Zn L3 edges indicates that the spontaneous polarization is along the [0001] direction. The analysis of Er L3-edge XAFS demonstrates that the local structure around Er in the ZnO:Er NRAs was transformed from O(h) to C(4v), after annealing.
authors.affiliation: Institute of Photonics and Optoelectronics, Department of Electrical Engineering, National Taiwan University, Taipei 10617, Taiwan.
authors.forename: Cheng-Ying
authors.initials: CY
authors.lastname: Chen
authors.forename: Kun-Yu
authors.initials: KY
authors.lastname: Lai
authors.forename: Jian-Wei
authors.initials: JW
authors.lastname: Lo
authors.forename: Chin-An
authors.initials: CA
authors.lastname: Lin
authors.forename: Shu-Hsien
authors.initials: SH
authors.lastname: Chiu
authors.forename: Yen-Chun
authors.initials: YC
authors.lastname: Chao
authors.forename: Jr-Hau
authors.initials: JH
authors.lastname: He