In this paper we provide strong evidence of direct gap absorption in germanium nanostructured films. By performing first-principles calculations of the optical spectra for the three main low-index orientations, we show that, due to wave-function localization both in real and reciprocal space, the Ge(100) quantum films are, in particular, good candidates for the visible photoluminescence observation.
True direct gap absorption in germanium quantum films / Kholod, A. N.; Ossicini, Stefano; Borisenko, V. E.; D'Avitaya, F. A.. - In: PHYSICAL REVIEW. B, CONDENSED MATTER AND MATERIALS PHYSICS. - ISSN 1098-0121. - STAMPA. - 65:(2002), pp. 115315-1-115315-4. [10.1103/PhysRevB.65.115315]
True direct gap absorption in germanium quantum films
OSSICINI, Stefano;
2002
Abstract
In this paper we provide strong evidence of direct gap absorption in germanium nanostructured films. By performing first-principles calculations of the optical spectra for the three main low-index orientations, we show that, due to wave-function localization both in real and reciprocal space, the Ge(100) quantum films are, in particular, good candidates for the visible photoluminescence observation.
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