Epitaxial Ge-rich silicon layers after dry oxidation of Ge implanted silicon


We report on formation of epi-layer of SixGe1-x by taking standard procedure in CMOS technology. The competitive process of solid solubility of Ge dopant into Si and SiO2 is the key to engineer atomically sharp, low defect very thin epitaxial layer at the interface of oxide-Si. Oxidation time process was used to control the distribution of the doped Ge ions at the interface of Si with oxide and in the oxide layer. Implanted samples (35 keV and 1 x 10(16) Ge+/cm(2)) were oxidized at 1050 degrees C for 30-90 min. RBS-Channeling analysis shows two separate peaks of Ge corresponds to different depths after oxidation. Corroborate with high resolution micro-scopy and elemental analysis, we determined the first peak as enriched layer of SixGe1-x at the interface of SiO2 Si. Less than 10 nm epitaxially grown interfacial layer is very low in defects, and Ge ions are fully substituted into the host lattice. The second peak originated from diffusion of Ge into SiO2 resulted in a segregated layer containing Ge in oxide film. Technological demand on forming SixGe1-x layer for CMOS application through standard routes is what we address in this research.



subject category

Materials Science; Physics


Baghizadeh, A; Lotfi, E; Agha-Aligol, D

our authors



A.B acknowledges the FCT project REDE/1509/RME/2005 in order to access all microscopes in pole of electron microscopy in CICECO, University of Aveiro, Portugal.

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