Raman and TEM studies of Ge nanocrystal formation in SiOx : Ge/SiOx multilayers

International Conference on Superlattices, Nano-Structures and Nano-Devices -- JUL 30-AUG 04, 2006 -- Istanbul, TURKEY Finstad, Terje/0000-0003-1293-3126 WOS: 000245877200016 Alternating germanosilicate-siliconoxide layers of 10-30 nm thickness were grown on Si substrates by plasma enhanced chemically vapor deposition (PECVD). The compositions of the grown films were determined by X-ray photoelectron spectroscopy measurements. The films were annealed at temperatures varying from 670 to 1000 degrees C for 5 to 45 minutes under nitrogen atmosphere. High resolution cross section TEM images, electron diffraction and electron energy-loss spectroscopy as well as energy-dispersive X-ray analysis (EDAX) data confirm presence of Ge nanocrystals in each layer. The effect of annealing on the Ge nanocrystal formation in multilayers was investigated by Raman spectroscopy and Transmission Electron Microscopy (TEM). As the annealing temperature is raised to 850 degrees C, single layer of Ge nanocrystals observed at lower annealing temperatures is transformed into a double layer with the smaller sized nanocrystals closer to the substrate SiO2 interface. (c) 2007 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. European FP6European Union (EU) [505285]; TUBITAKTurkiye Bilimsel ve Teknolojik Arastirma Kurumu (TUBITAK) [TBAG-U/85(103T115)] This work is a supported by European FP6 project SEMINANO with the contract number 505285 and by TUBITAK under contract TBAG-U/85(103T115). We gratefully acknowledge Prof. S. Suzer of Bilkent University, Chemistry Department for the XPS measurements