Infrared dielectric functions and optical phonons of wurtzite YxAl1-xN (0 less than= x less than= 0.22)

Ben Sedrine, NabihaLinköpings universitet,Tunnfilmsfysik,Tekniska högskolan,University of Aveiro, Portugal; University of Aveiro, Portugal (author)

Funding Agencies|Swedish Research Council (VR) [2013-5580]; Swedish Governmental Agency for Innovation Systems (VINNOVA) [2011-03486]; Swedish Foundation for Strategic Research (SSF) [2012FFL12-0181]; National Science Foundation [MRSEC DMR-0820521, EPS-1004094]; Stiftelsen Lars Hiertas Minne [FO2013-0587]; [RECI/FIS-NAN/0183/2012 (FCOMP-01-0124-FEDER-027494)]
YAlN is a new member of the group-III nitride family with potential for applications in next generation piezoelectric and light emitting devices. We report the infrared dielectric functions and optical phonons of wurtzite (0001) YxAl1-xN epitaxial films with 0 less than= x less than= 0.22. The films are grown by magnetron sputtering epitaxy on c-plane Al2O3 and their phonon properties are investigated using infrared spectroscopic ellipsometry and Raman scattering spectroscopy. The infrared-active E-1(TO) and LO, and the Raman active E-2 phonons are found to exhibit one-mode behavior, which is discussed in the framework of the MREI model. The compositional dependencies of the E-1(TO), E-2 and LO phonon frequencies, the high-frequency limit of the dielectric constant, epsilon(infinity), the static dielectric constant, epsilon(0), and the Born effective charge Z(B) are established and discussed.

Zukauskaite, AgneLinköpings universitet,Institutionen för fysik, kemi och biologi,Tekniska fakulteten,Fraunhofer Institute Appl Solid State Phys, Germany(Swepub:liu)agnzu70 (author)
Birch, JensLinköpings universitet,Tunnfilmsfysik,Tekniska fakulteten(Swepub:liu)jenbi91 (author)
Jensen, JensLinköpings universitet,Tunnfilmsfysik,Tekniska fakulteten(Swepub:liu)jenje80 (author)
Hultman, LarsLinköpings universitet,Tunnfilmsfysik,Tekniska fakulteten(Swepub:liu)larhu75 (author)
Schoeche, S.University of Nebraska, NE 68588 USA (author)
Schubert, M.University of Nebraska, NE 68588 USA (author)
Darakchieva, VanyaLinköpings universitet,Halvledarmaterial,Tekniska fakulteten(Swepub:liu)vanda79 (author)
Linköpings universitetTunnfilmsfysik (creator_code:org_t)

By the author/editor: Ben Sedrine, Nab ...; Zukauskaite, Agn ...; Birch, Jens; Jensen, Jens; Hultman, Lars; Schoeche, S.; show more...; Schubert, M.; Darakchieva, Van ...; show less...

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