Reduced thermal conductivity of epitaxial GaAs on Si due to symmetry-breaking biaxial strain

Abstract

Epitaxial growth of III-V semiconductors on Si is a promising route for silicon photonics. Threading dislocations and the residual thermal stress generated during growth are expected to affect the thermal conductivity of the III-V semiconductors, which is crucial for efficient heat dissipation from photonic devices built on this platform. In this work, we combine a non-contact laser-induced transient thermal grating technique with ab initio phonon simulations to investigate the in-plane thermal transport of epitaxial GaAs-based buffer layers on Si, employed in the fabrication of III-V quantum dot lasers. Surprisingly, we find a significant reduction of the in-plane thermal conductivity of GaAs, up to 19%, as a result of a small in-plane biaxial stress of 250 MPa. Using ab initio phonon calculations, we attribute this effect to the enhancement of phonon-phonon scattering caused by the in-plane biaxial stress, which breaks the cubic crystal symmetry of GaAs. Our results indicate the importance of eliminating the residual thermal stress in the epitaxial III-V layers on Si to avoid the reduction of thermal conductivity and facilitate heat dissipation. Additionally, our results showcase potential means of effectively controlling thermal conductivity of solids with external strain/stress.

arXiv comment8 pages, 8 figures

References in corpus (6)

• Phonons and related properties of extended systems from density-functional perturbation theory
• Dislocation-induced thermal transport anisotropy in single-crystal group-III nitride films
• Gallium Arsenide Thermal Conductivity and Optical Phonon Relaxation Times from First-Principles Calculations
• Phase-controlled, heterodyne laser-induced transient grating measurements of thermal transport properties in opaque material
• Scanning Ultrafast Electron Microscopy: A Novel Technique to Probe Photocarrier Dynamics with High Spatial and Temporal Resolutions
• Theory of Electron-Phonon-Dislon Interacting System - Toward a Quantized Theory of Dislocations

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