TITLE

Interface states at ZnSe/Ge heterojunctions: the role of atomic interdiffusion and disorder

AUTHOR(S)
Peressi, M.; Favot, F.; Cangiani, G.; Baldereschi, A.
PUB. DATE
December 2002
SOURCE
Applied Physics Letters;12/30/2002, Vol. 81 Issue 27, p5171
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
The origin of electronic states localized at ZnSe/Ge (110) interface is investigated by means of ab initio pseudopotential calculations. Some selected interface configurations are considered, one corresponding to the abrupt interface and others corresponding to partially disordered interfaces, with Zn-Ge or Se-Ge swaps. Remarkably, the existence of interface electronic states within the heterojunction band gap critically depends on the atomic-scale morphology of the interface: unlike the abrupt case, disordered interfaces exhibit localized states extending over the whole interface Brillouin zone. The presence of interfacial density of states, experimentally detectable, is therefore an indication of disorder and atomic interdiffusion.
ACCESSION #
8737937

 

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