Phonons in strained AlGaN/GaN superlattices
2007 (English)In: Physica Status Solidi. C, Current topics in solid state physics, ISSN 1610-1634, E-ISSN 1610-1642, Vol. 4, no 1, 170-174 p.Article in journal (Refereed) Published
Phonons in strained AlGaN/GaN superlattices (SLs) with constant periods but different Al composition have been studied using a combination of infrared spectroscopic ellipsometry and Raman scattering spectroscopy. The following SL modes were identified: i) AlGaN localized E1(TO) modes identified for the first time and AlGaN localized A1 (LO) phonons; ii) GaN localized E2, E1(TO) and A1(LO) phonons; iii) delocalized E1(LO) phonons; iv) A1(TO) phonon; v) two modes around 660 cm-1 and 594-625 cm-1, respectively, not predicted by theory. The effects of strain and composition on the phonon frequencies were established and discussed.
Place, publisher, year, edition, pages
2007. Vol. 4, no 1, 170-174 p.
Al compositions, AlGaN/gaN, Blue lasers, Infrared spectroscopic ellipsometry, International symposium, Raman scattering spectroscopy
IdentifiersURN: urn:nbn:se:kth:diva-154896DOI: 10.1002/pssc.200673582ISI: 000245874000041ScopusID: 2-s2.0-49549093622OAI: oai:DiVA.org:kth-154896DiVA: diva2:765574
6th International Symposium on Blue Laser and Light Emitting Diodes, ISBLLED 2006; Montpellier; France; 15 May 2006 through 19 May 2006
QC 201411242014-11-242014-10-292014-11-24Bibliographically approved