Optical Absorption in Periodic InN:In Structures
D.S. Plotnikov, T.V. Shubina, V.N. Jmerik, A.N. Semenov and S.V. Ivanov
Ioffe Physico-Technical Institute, Russian Academy of Sciences, St. Petersburg 194021, Russia
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Received: 9 06 2007;
Optical absorption measurements were exploited to study periodic InN:In structures grown by plasma-assisted molecular beam epitaxy with the thickness of the metallic inclusions varied from 2 to 48 monolayers. We demonstrate that the observed higher-energy shift of an effective absorption edge may be due to In depletion of the InN matrix via the coalescence of In into large clusters, accompanied by the respective higher-energy shift of the Mie resonance. The relevant uncertainty in the optical gap of InN is discussed.
DOI: 10.12693/APhysPolA.112.191
PACS numbers: 78.66.-w, 71.45.Gm