Heteroepitaxial growth of non‐polar ZnO films on single crystal NdGaO3 (001) substrates by MOCVD. Issue 7 (24th March 2014)

• Record Type: Journal Article
• Authors: Kashiwaba, Yasuhiro; Yokoyama, Tai; Sakuma, Mio; Abe, Takami; Nakagawa, Akira; Niikura, Ikuo; Kashiwaba, Yasube; Daibo, Masahiro; Osada, Hiroshi
• Is Part Of: Physica status solidi. Volume 11:Issue 7/8(2014:Jul.)
• Page Start: 1361
• Page End: 1364
• Publication Date: 2014-03-24
• Subjects: ZnO -- non‐polar -- NdGaO3 -- epitaxy; Solid state physics -- Congresses; Solid state physics -- Periodicals; Solid state physics; Conference proceedings; Periodicals; 530.41
• DOI: 10.1002/pssc.201300573
• Languages: English
• ISSNs: 1862-6351

Abstract

Abstract: High‐quality non‐polar ZnO (11$ \bar 2 $ 0) films were epitaxially grown on single crystal NdGaO3 (NGO) (001) substrates. The non‐polar ZnO (11$ \bar 2 $ 0) films were grown by metal organic chemical vapour deposition using Zn(C5 H7 O2 )2 and O2 gas as starting materials. X‐ray diffraction (XRD) peaks of ZnO (11$ \bar 2 $ 0) plane were observed in XRD patterns of 2θ‐ω scans in all films. Rotation domains were not found in XRD φ scan patterns of ZnO (11$ \bar 2 $ 0) films grown at a substrate temperature of 650 °C or less. XRD peaks of NGO (021) and ZnO (11$ \bar 2 $ 2) planes were observed at the same angle φ in the XRD φ scan patterns. The epitaxial relationship was ZnO (11$ \bar 2 $ 0)// NGO (001) and ZnO [0001] // NGO [010]. Lattice mismatch values along the ZnO [0001] direction and along the ZnO (1$ \bar 1 $ 00) direction were 5.36% and –3.70%, respectively. Growth rate was drastically decreased at the substrate temperature over 650 °C. Striped patterns along the ZnO [0001] direction were observed in atomic force microscopy images of ZnO (11$ \bar 2 $ 0) films grown at substrate temperatures of 600 and 650 °C. Emissions due to donor‐bound excitions were observed in photoluminescence spectra of ZnO (11$ \bar 2 $ 0) films measured at 10 K. It is thought that NGO (001) substrates are useful for growth of high‐quality non‐polar ZnO (11$ \bar 2 $ 0) films. (© 2014 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)