Adsorbed Molecules and Surface Treatment Effect on Optical Properties of ZnO Nanowires Grown by MOCVD

• Published in: Journal of electronic materials Vol. 46; no. 7; pp. 4690 - 4694
• Main Authors: Jabri, S., Souissi, H., Sallet, V., Lusson, A., Meftah, A., Galtier, P., Oueslati, M.
• Format: Journal Article
• Language: English
• Published: New York Springer US 01.07.2017; Springer Nature B.V
• Subjects: Annealing; Characterization and Evaluation of Materials; Chemical vapor deposition; Chemistry and Materials Science; Electronics and Microelectronics; Emissions control; Excitons; Instrumentation; Materials Science; Metalorganic chemical vapor deposition; Nanowires; Nitrous oxide; Optical and Electronic Materials; Optical properties; Oxygen; Photoluminescence; Rare gases; Solid State Physics; Spectral emissivity; Surface treatment; Vibrational spectra; Zinc oxide; adsorbed molecules; Raman; surface excitons; ZnO nanowires; MOCVD; Photoluminescence
• ISSN: 0361-5235; 1543-186X
• DOI: 10.1007/s11664-017-5459-z

We have investigated the optical properties of ZnO nanowires grown by metalorganic chemical vapor deposition (MOCVD) with nitrous oxide (N 2 O) as oxygen precursor. Photoluminescence (PL) and Raman measurements showed the influence of adsorbed molecules on the optical properties. Low-temperature (4 K) PL studies on the surface exciton (SX) at 3.3660 eV elucidated the nature and origin of this emission. In particular, surface treatment by annealing at high temperature under inert gas reduced the emission intensity of SX. Raman vibrational spectra proved that presence of a considerable amount of adsorbed molecules on the surface of ZnO nanowires plays a key role in the occurrence of surface excitons.