Observation of numerous E2 mode phonon replicas in the room temperature photoluminescence spectra of ZnO nanowires: Evidence of strong deformation potential electron-phonon coupling

Authors

S. Ramanathan, Virginia Commonwealth University
S. Bandyopadhyay, Virginia Commonwealth UniversityFollow
L. K. Hussey, University of South Florida
M. Muñoz, University of South Florida

Document Type

Article

Original Publication Date

2006

Journal/Book/Conference Title

Applied Physics Letters

Volume

89

Issue

14

DOI of Original Publication

10.1063/1.2360255

Comments

Orignally published at http://dx.doi.org/10.1063/1.2360255

Date of Submission

April 2015

Abstract

The authors report the observation of numerous (>20)phonon replica peaks in the room temperature photoluminescence spectrum of ZnOnanowires embedded in 50nm diameter pores of an anodic alumina film. The peaks are spaced in energy by ∼54meV, which is the energy of a nonpolar phonon with symmetry E2 in ZnO. These peaks are possibly caused by resonant phonon-assisted decay of photoexcited electrons to an impurity band, followed by radiative recombination. These results suggest that even though ZnO is strongly polar, deformation potential coupling to a nonpolar phonon mode may be stronger than Fröhlich coupling to polar phonon modes.

Rights

Ramanathan, S., Bandyopadhyay, S., Hussey, L.K., et al. Observation of numerous E2 mode phonon replicas in the room temperature photoluminescence spectra of ZnO nanowires: Evidence of strong deformation potential electron-phonon coupling. Applied Physics Letters, 89, 143121 (2006). Copyright © 2006 AIP Publishing LLC.

Is Part Of

VCU Electrical and Computer Engineering Publications