Optical and acoustic phonons in turbostratic and cubic boron nitride thin films on diamond substrates

Guzman, Erick; Kargar, Fariborz; Patel, Avani; Vishwakarma, Saurabh; Wright, Dylan; Wilson, Richard B.; Smith, David J.; Nemanich, Robert J.; Balandin, Alexander A.

doi:10.1016/j.diamond.2023.110452

Cited by 6 publications

(1 citation statement)

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“…Current techniques such as electron microscopy can provide extensive information about local bond quality at a region of interest, but they are destructive and require direct line-of-sight access to the failure region. , Methods such as confocal scanning acoustic microscopy offer a picture of debonded regions, but are resolution limited . Recent work has shown that nondestructive evaluation of bond quality can be achieved with high spatial resolution using Brillouin-Mandelstam light scattering spectroscopy to probe energies in acoustic phonons and velocities of Rayleigh acoustic waves at interfaces …”

Section: Introductionmentioning

confidence: 99%

Inversion for Thermal Properties with Frequency Domain Thermoreflectance

Treweek,

Akcelik,

Hodges

et al. 2024

ACS Appl. Mater. Interfaces

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3D integration of multiple microelectronic devices improves size, weight, and power while increasing the number of interconnections between components. One integration method involves the use of metal bump bonds to connect devices and components on a common interposer platform. Significant variations in the coefficient of thermal expansion in such systems lead to stresses that can cause thermomechanical and electrical failures. More advanced characterization and failure analysis techniques are necessary to assess the bond quality between components. Frequency domain thermoreflectance (FDTR) is a nondestructive, noncontact testing method used to determine thermal properties in a sample by fitting the phase lag between an applied heat flux and the surface temperature response. The typical use of FDTR data involves fitting for thermal properties in geometries with a high degree of symmetry. In this work, finite element method simulations are performed using high performance computing codes to facilitate the modeling of samples with arbitrary geometric complexity. A gradient-based optimization technique is also presented to determine unknown thermal properties in a discretized domain. Using experimental FDTR data from a GaN-diamond sample, thermal conductivity is then determined in an unknown layer to provide a spatial map of bond quality at various points in the sample.

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Section: Introductionmentioning

confidence: 99%

Inversion for Thermal Properties with Frequency Domain Thermoreflectance

Treweek,

Akcelik,

Hodges

et al. 2024

ACS Appl. Mater. Interfaces

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show abstract

First-principles studying for quantum defects in cubic boron nitride

Nguyen

2025

Computational Materials Science

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Phonon-assisted carrier transport and indirect optical absorption of cubic boron nitride from first-principles

Iqbal,

Cheng,

Duan

et al. 2024

Journal of Applied Physics

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Inquiring the isotopically engineered carrier transport in polar materials remains an open question. Herein, the phonon-limited drift carrier mobility of single-crystal cubic boron nitride is presented using first-principles calculations. Natural c-BN has the predicted electron mobility of 1230 and 760 cm2/V s by solving the iterative Boltzmann transport equation and self-energy relaxation time approximation, respectively. The hole mobility under the Boltzmann transport equation and self-energy relaxation time approximation is 193 and 105 cm2/Vs, respectively. Subsequently, the electron and hole mobilities at the stable isotope levels of boron and nitride are predicted, and nitride isotopes are found to be more effective than boron for carrier mobility. Those carrier mobilities further decrease with increasing temperature due to the strengthened electron–phonon interactions. Moreover, the phonon-assisted indirect optical absorption of c-BN is investigated by considering the contribution of phonons to the indirect electronic inter-band transitions. The predicted imaginary part of the dielectric function is in better agreement with previous experiments. This work aims to understand the role of phonons in determining the carrier mobility and indirect optical absorption of c-BN.

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Optical and acoustic phonons in turbostratic and cubic boron nitride thin films on diamond substrates

Cited by 6 publications

References 50 publications

Inversion for Thermal Properties with Frequency Domain Thermoreflectance

Inversion for Thermal Properties with Frequency Domain Thermoreflectance

First-principles studying for quantum defects in cubic boron nitride

Phonon-assisted carrier transport and indirect optical absorption of cubic boron nitride from first-principles

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