Realization of epitaxial ZnO layers on GaP(111) substrates by pulsed laser deposition

Abstract

Epitaxy of ZnO layers on cubic GaP (111) substrates has been demonstrated using pulsed laser deposition. Out of plane and in-plane epitaxial relationship of ZnO layer with respect to GaP substrate determined using phi scans in high resolution X-ray diffraction measurements are (0001) ZnO || (111) GaP and (-1 2 -1 0) ZnO || (-1 1 0) GaP respectively. Our results of epitaxy of ZnO and its intense excitonic photoluminescence with very weak defect luminescence suggest that (111) oriented GaP can be a potential buffer layer choice for the integration of ZnO based optoelectronic devices on Si(111) substrates.