Raman analysis of longitudinal optical phonon-plasmon coupled modes of aligned ZnO nanorods

An Jen Cheng, Yonhua Tzeng, Hui Xu, Siddharth Alur, Yaqi Wang, Minseo Park, Tsung Hsueh Wu, Curtis Shannon, Dong Joo Kim, Dake Wang

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53 Citations (Scopus)

Abstract

The electronic properties of vertically aligned ZnO nanorods have been investigated using micro-Raman spectroscopy. The concentration and mobility of the charge carriers were determined via Raman line shape analysis using longitudinal-optical-phonon-plasmon coupled mode. The local laser heating and the stress effects have been considered when analyzing the Raman spectra. The mobility and carrier concentration of the aligned ZnO nanorods are 84.8 cm2 V s and 3.8× 1017 cm-3, respectively. As a comparison, the mobility and carrier concentration of the undoped bulk ZnO were also obtained from the Raman line shape analysis. The mobility of the aligned ZnO nanorods is about 20% lower than that of the undoped bulk ZnO, which can be attributed to enhanced surface scattering due to the reduction in dimension.

Original languageEnglish
Article number073104
JournalJournal of Applied Physics
Volume105
Issue number7
DOIs
Publication statusPublished - 2009

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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