title: Optical and electrical performance of HfO2 coated ZnO nanorod arrays.
abstract: In this paper, we demonstrate the optical and electrical performance of ZnO nanorod arrays after surface passivation. The material of larger band gaps (HfO2) was chosen for the surface passivation layer through atom layer deposition (ALD), in order to confine the carriers within the core material efficiently. In the case of nanorods with high defects, HfO2 coating treatment not only improved near band edge (NBE) but also greatly enhanced the defect luminescence, while in the case of nanorods with low defects, surface coating suppressed defect luminescence and promoted the NBE emission as well as electrical performance therein. PL investigation at 10 K displayed that after surface coating phonon related emission was confined along c-axis and the exciton emission related to surface states was largely restrained. Therefore, it's suggested that surface passivation of ZnO nanorod arrays decreases the surface defect, enhances the side confinement of nanorod, and thus improves the optical and electrical performance efficiently.
authors: Key Laboratory for the Physics and Chemistry of Nanodevices and Department of Electronics, Peking University, Beijing 100871, China.
authors: Xiaoxian
authors: X
authors: Zhang
authors: Lihuan
authors: L
authors: Zhang
authors: Guoqing
authors: G
authors: Yan
authors: Jun
authors: J
authors: Shen
authors: Min
authors: M
authors: Gao
authors: Jinzhu
authors: J
authors: Li
authors: Haibo
authors: H
authors: Dong
authors: Duan
authors: D
authors: Zhao
authors: Le
authors: L
authors: Cai
authors: Qing
authors: Q
authors: Chen
authors: Weiya
authors: W
authors: Zhou
authors: Sishen
authors: S
authors: Xiel