We report XAFS studies of two related strained semiconductor systems: nominally matched short period InGaAs/InP(001) superlattices and strained epilayers of InxGa1-xAs on InP(001). In InGaAs/InP superlattices coordination numbers deviate significantly from the abrupt interface case, demonstrating the presence of strained interface layers. This provides a local structural explanation for the non-negligible average lattice mismatch measured by diffraction. The analysis of strained epilayers of InxGa1-xAs/InP(001) allows us to study in detail bond lengths in strained semiconductors. We demonstrate that, notwithstanding the rigidity of semiconductor bonds, strain induces variations of nearest neighbor distances: bond lengths can be stretched or compressed. A model which reproduces strain-induced variations is presented.

Local structure in semiconductor superlattices and epilayers

ROMANATO, FILIPPO;DE SALVADOR, DAVIDE;DRIGO, ANTONIO
1999

Abstract

We report XAFS studies of two related strained semiconductor systems: nominally matched short period InGaAs/InP(001) superlattices and strained epilayers of InxGa1-xAs on InP(001). In InGaAs/InP superlattices coordination numbers deviate significantly from the abrupt interface case, demonstrating the presence of strained interface layers. This provides a local structural explanation for the non-negligible average lattice mismatch measured by diffraction. The analysis of strained epilayers of InxGa1-xAs/InP(001) allows us to study in detail bond lengths in strained semiconductors. We demonstrate that, notwithstanding the rigidity of semiconductor bonds, strain induces variations of nearest neighbor distances: bond lengths can be stretched or compressed. A model which reproduces strain-induced variations is presented.
File in questo prodotto:
Non ci sono file associati a questo prodotto.
Pubblicazioni consigliate

Caricamento pubblicazioni consigliate

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11577/2459344
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 1
  • ???jsp.display-item.citation.isi??? 1
social impact