V. A. Volodin, E. V. Gorokhov, D. V. Marin, H. Rinnert, P. Miska, M. Vergnat, “Quasi-direct optical transitions in Ge nanocrystals embedded in GeO<nobr>$_2$</nobr> matrix”, Pis'ma v Zh. Èksper. Teoret. Fiz., 2009, Volume 89, Issue 2,Pages <nobr>84

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CONDENSED MATTER

Quasi-direct optical transitions in Ge nanocrystals embedded in GeO$_2$ matrix

V. A. Volodin^ab, E. V. Gorokhov^b, D. V. Marin^bc, H. Rinnert^c, P. Miska^c, M. Vergnat^c

^a Novosibirsk State University
^b Institute of Semiconductor Physics Siberian branch RAS
^c Laboratoire de Physique des Matériaux (LPM), Nancy-Université, CNRS, 54506 Vandœuvre lès Nancy, France

Abstract: GeO$_2$ films with germanium nanocrystals (NCs) were deposited from supersaturated GeO vapor with subsequent dissociation on Ge:GeO$_2$. The films were studied using photoluminescence (PL), Raman scattering, IR-spectroscopy techniques. Ge NCs in initial film have sizes about 6–8 nm and have no visible PL signal. The broad green-red PL peak was detected in Ge:GeO$_2$ films after thermal annealings. According to effective mass approach, maximum of PL signal from such relatively big Ge NCs should be in IR region. The experimentally observed PL signal is presumably originated due to quasi-direct $L_1-L_3'$ optical transitions “folded” in germanium NCs.

PACS: 63.22.+m, 78.40.Fy, 81.05.Ys

Received: 04.12.2008

Language: English