Assessing structural, free-charge carrier, and phonon properties of mixed-phase epitaxial films: The case of InN
2014 (English)In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 90, no 19, 195306- p.Article in journal (Refereed) Published
We develop and discuss appropriate methods based on x-ray diffraction and generalized infrared spectroscopic ellipsometry to identify wurtizte and zinc-blende polymorphs, and quantify their volume fractions in mixed-phase epitaxial films taking InN as an example. The spectral signatures occurring in the azimuth polarization (Muller matrix) maps of mixed-phase epitaxial InN films are discussed and explained in view of polymorphism (zinc-blende versus wurtzite), volume fraction of different polymorphs and their crystallographic orientation, and azimuth angle. A comprehensive study of the structural, phonon and free electron properties of zinc-blende InN films containing inclusions of wurtzite InN is also presented. Thorough analysis on the formation of the zinc-blende and wurtzite phases is given and the structural evolution with film thickness is discussed in detail. The phonon properties of the two phases are determined and discussed together with the determination of the bulk free-charge carrier concentration, and electron accumulation at the mixed-phase InN film surfaces.
Place, publisher, year, edition, pages
American Physical Society , 2014. Vol. 90, no 19, 195306- p.
Chemical Sciences Physical Sciences
IdentifiersURN: urn:nbn:se:liu:diva-113012DOI: 10.1103/PhysRevB.90.195306ISI: 000345423000003OAI: oai:DiVA.org:liu-113012DiVA: diva2:779001
Funding Agencies|Swedish Research Council (VR) [2013-5580]; Swedish Governmental Agency for Innovation Systems (VINNOVA) under the VINNMER international qualification program [2011-03486]; Swedish Foundation for Strategic Research (SSF) [FFL12-0181]; Linkoping Linnaeus Initiative on Nanoscale Functional Materials (LiLiNFM) by VR; National Science Foundation [MRSEC DMR-0820521]; University of Nebraska-Lincoln; J. A. Woollam Co., Inc.; J. A. Woollam Foundation2015-01-122015-01-082015-03-09