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|Title:||Raman scattering and transverse effective charge of MOCVD-grown GaN films between 78 and 870 K|
|Authors:||Li, W.S. |
|Citation:||Li, W.S.,Shen, Z.X.,Feng, Z.C.,Chua, S.J. (1999). Raman scattering and transverse effective charge of MOCVD-grown GaN films between 78 and 870 K. Surface and Interface Analysis 28 (1) : 173-176. ScholarBank@NUS Repository. https://doi.org/10.1002/(SICI)1096-9918(199908)28:13.0.CO;2-7|
|Abstract:||First-order Raman scattering of a hexagonal GaN film is studied in the temperature range T = 78-870 K. The temperature dependence of its five Raman modes is obtained, where both the line width and Raman shift exhibit a quadratic dependence on temperature in our measured temperature range. Excellent agreement was obtained between the experimental data and the calculated results based on a model involving three-phonon and four-phonon coupling. In addition, the splitting between the longitudinal-optical (LO) and transverse-optical (TO) phonons was found to decrease with increasing temperature. From these data, a weak non-linear decrease of the transverse effective charge with increasing temperature is derived. Comparison of the transverse effective charge eT* at room temperature was made between experimental data and theoretical calculations by a pseudopotential expression and bond orbital model (BOM). Good agreement between theory and experiment was achieved.|
|Source Title:||Surface and Interface Analysis|
|Appears in Collections:||Staff Publications|
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