Electronic localization and optical absorption in embedded silicon nanograins

Bagolini, Luigi; Mattoni, Alessandro; Colombo, Luciano
February 2009
Applied Physics Letters;2/2/2009, Vol. 94 Issue 5, pN.PAG
Academic Journal
We study the spatial distribution of electron states in crystalline Si nanograins embedded into amorphous silicon. We prove that it is not possible to tune the absorption gap by only controlling the size of the grain, since no quantum confinement there occurs. The absorption properties of such a two-phase system are rather controlled by the population of localized electron states generated by large angular distortions of Si–Si bonds.


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