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VOLUME 89 (2009) | ISSUE 2 | PAGE 84
Quasi-direct optical transitions in Ge nanocrystals embedded in GeO2 matrix
PACS: 63.22.+m, 78.40.Fy, 81.05.Ys
Abstract
GeO2 films with germanium nanocrystals (NCs) were deposited from supersaturated GeO vapor with subsequent dissociation on Ge:GeO2. 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:GeO2 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 qusi-direct L1-L3' optical transitions "folded" in germanium NCs.