A study of the strain distribution by scanning X-ray diffraction on GaP/Si for III–V monolithic integration on silicon - Archive ouverte HAL
Journal Articles Journal of Applied Crystallography Year : 2019

A study of the strain distribution by scanning X-ray diffraction on GaP/Si for III–V monolithic integration on silicon

Yanping Wang
Joël Eymery
Ludovic Largeau

Abstract

A synchrotron-based scanning X-ray diffraction study on a GaP/Si pseudo-substrate is reported, within the context of the monolithic integration of photonics on silicon. Two-dimensional real-space mappings of local lattice tilt and in-plane strain from the scattering spot distributions are measured on a 200 nm partially relaxed GaP layer grown epitaxially on an Si(001) substrate, using an advanced sub-micrometre X-ray diffraction microscopy technique (K-Map). Cross-hatch-like patterns are observed in both the local tilt mappings and the in-plane strain mappings. The origin of the in-plane local strain variation is proposed to be a result of misfit dislocations, according to a comparison between in-plane strain mappings and transmission electron microscopy observations. Finally, the relationship between the in-plane strain and the free surface roughness is also discussed using a statistical method.
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Dates and versions

hal-02289442 , version 1 (16-09-2019)

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Ang Zhou, Yanping Wang, Charles Cornet, Yoan Léger, Laurent Pedesseau, et al.. A study of the strain distribution by scanning X-ray diffraction on GaP/Si for III–V monolithic integration on silicon. Journal of Applied Crystallography, 2019, 52 (4), pp.809-815. ⟨10.1107/S1600576719008537⟩. ⟨hal-02289442⟩
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