Raman investigation of GaP-Si interfaces grown by molecular beam epitaxy

Alexandre Bondi (1) , Charles Cornet (1) , Soline Richard (1) , Thanh Tra Nguyen (1) , Antoine Létoublon (1) , Laurent Pedesseau (1) , Olivier Durand (1) , Alain Moréac (2) , Anne Ponchet (3) , Alain Le Corre (1) , Jacky Even (1)

1 FOTON - Fonctions Optiques pour les Technologies de l'informatiON
2 IPR - Institut de Physique de Rennes
3 CEMES - Centre d'élaboration de matériaux et d'études structurales

Raman spectroscopy was used to investigate the residual strain in thin GaP layers deposited on Si substrates by molecular beam epitaxy. Different growth conditions were used to obtain a clean GaP-Si interface, including migration enhanced epitaxy. The strain induced Raman shifts of the longitudinal and the transverse optical GaP lattice modes were analyzed. The effects of crystalline defects are discussed, supported by high resolution transmission electron microscopy and X-ray scattering studies. Finally, Raman Spectroscopy reveals the presence of disorder (or surface)-activated optical phonons. This result is discussed in the light of surface morphology analyses.

Domaines: Optique / photonique

Alexandre Bondi, Charles Cornet, Soline Richard, Thanh Tra Nguyen, Antoine Létoublon, et al.. Raman investigation of GaP-Si interfaces grown by molecular beam epitaxy. European Materials Research Society Spring Meeting 2012 (E-MRS Spring 2012), May 2012, Strasbourg, France. pp.72-75, ⟨10.1016/j.tsf.2012.11.132⟩. ⟨hal-00788308⟩