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Study of the interdiffusion effect on the band structures of Si1-xGex/Si quantum wells

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6 Author(s)
Dang, Y.X. ; School of Electrical and Electronic Engineering, Nanyang Technological University, Singapore 639798, Singapore ; Fan, W.J. ; Lu, F. ; Wang, H.
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We investigated the influence of thermal interdiffusion on the band structures of Si1-xGex/Si single quantum wells (SQWs) with a well width of 125 Å and Ge concentration x=0.3. Rapid thermal annealing with the temperatures of 750 and 800 °C leads to substantial interdiffusion indicated by a significant photoluminescence (PL) blueshift as large as 46 meV. The effect is modeled by a Si–Ge atomic interdiffusion at the heterointerface. The band structures and optical transitions of QW after interdiffusion were calculated based on an error function distribution and the 6+2-band k∙p method. The diffusion lengths of the intermixing process are deduced from the PL shift. The thermal dependence of the interdiffusion coefficients follows the Arrhenius law. An activation energy (Ea) for interdiffusion of 2.75 eV is obtained. Our investigation indicates that the 6+2-band k∙p formalism is valid for interdiffused Si1-xGex/Si QWs.

Published in:

Journal of Applied Physics  (Volume:99 ,  Issue: 7 )

Date of Publication:

Apr 2006

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