کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1595669 | 1645419 | 2009 | 4 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Effect of temperature on Raman scattering in hexagonal ZnMgO for optoelectronic applications Effect of temperature on Raman scattering in hexagonal ZnMgO for optoelectronic applications](/preview/png/1595669.png)
We have carried out a detailed investigation of temperature-dependent micro-Raman scattering on hexagonal ZnMgO films with different Mg compositions (0–0.323). The phonon frequencies downshift and linewidths broadening of A1A1 [longitudinal optical (LO)] and E1E1(LO) modes can be well explained by a model involving the contributions of thermal expansion, lattice-mismatch-induced strain, and anharmonic phonon processes. We have elucidated the variation with Mg composition of the contribution of the three- and four-phonon processes in the anharmonic effect. The present work establishes an experimental base for the micro-Raman technique to monitor the local temperature during the ZnMgO-based device operation with a submicrometer spatial resolution.
Journal: Solid State Communications - Volume 149, Issues 1–2, January 2009, Pages 10–13