Effects of Boron Doping on the Bulk and Surface Acoustic Phonons in Single-Crystal Diamond

Guzman, Erick; Kargar, Fariborz; Angeles, Frank; Meidanshahi, Reza Vatan; Grotjohn, T.A.; Hardy, Aaron; Muehle, Matthias; Wilson, R. B.; Goodnick, Stephen M.; Balandin, Alexander A.

doi:10.1021/acsami.2c10879

Cited by 8 publications

(3 citation statements)

References 62 publications

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“…The intensity of the 2D peak is much lower than the G-peak indicating the presence of a mixture of single-layer and few-layer graphene in the composite samples. The Brillouin spectroscopy allows probing low-energy acoustic phonons near the Brillouin-zone (BZ) center with energies in the range of 2 GHz to 900 GHz 30 , 34 – 36 . In bulk polymers, the Brillouin spectrum is dominated by the inelastic scattering of light from bulk phonons, i.e., elastic vibrations, through the opto-elastic effect 37 .…”

Section: Resultsmentioning

confidence: 99%

Cryogenic characteristics of graphene composites—evolution from thermal conductors to thermal insulators

Nataj

Wright

et al. 2023

Nat Commun

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The development of cryogenic semiconductor electronics and superconducting quantum computing requires composite materials that can provide both thermal conduction and thermal insulation. We demonstrated that at cryogenic temperatures, the thermal conductivity of graphene composites can be both higher and lower than that of the reference pristine epoxy, depending on the graphene filler loading and temperature. There exists a well-defined cross-over temperature—above it, the thermal conductivity of composites increases with the addition of graphene; below it, the thermal conductivity decreases with the addition of graphene. The counter-intuitive trend was explained by the specificity of heat conduction at low temperatures: graphene fillers can serve as, both, the scattering centers for phonons in the matrix material and as the conduits of heat. We offer a physical model that explains the experimental trends by the increasing effect of the thermal boundary resistance at cryogenic temperatures and the anomalous thermal percolation threshold, which becomes temperature dependent. The obtained results suggest the possibility of using graphene composites for, both, removing the heat and thermally insulating components at cryogenic temperatures—a capability important for quantum computing and cryogenically cooled conventional electronics.

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Section: Resultsmentioning

confidence: 99%

Cryogenic characteristics of graphene composites—evolution from thermal conductors to thermal insulators

Nataj

Wright

et al. 2023

Nat Commun

Self Cite

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“…For example, by properly selecting the parameters of cladding materials and their thicknesses, one can control the group velocity of phonons near the sample surface [29,30]. In addition, the frequency and group velocity of acoustic phonons can decrease nonmonotonically with an increasing doping concentration, revealing pronounced phonon softening effects governed by the doping level [31]. The phonon hardening can be reached by isotope substitutions like in H 3 S, where replacement of 32 S atoms by the heavier isotopes 33 S, 34 S, 35 S, and 36 S produces a significant effect on the lattice dynamics [32].…”

Section: Conclusion and Discussionmentioning

confidence: 99%

Interference-induced surface superconductivity: Enhancement by tuning the Debye energy

et al. 2023

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In the usual perception, surface superconductivity is associated with the surface nucleation of a superconducting condensate above the upper critical field in type-II superconductors or with a rearrangement of phonon properties and the electron-phonon coupling near surfaces/interfaces. Recently, it has been found that there is another example when the surface superconducting temperature is increased up to 20-25% as compared to the bulk one due to constructive interference of superconducting pair states. In the present work, we demonstrate that in fact, such an interferenceinduced enhancement can be much more pronounced, up to nearly 70%. Furthermore, here it is shown that such an interference enhancement persists over a wide range of microscopic parameters.

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“…Incorporating boron impurity into the crystal lattice of a diamond significantly affects its phonon spectrum. The frequency of optical and acoustic phonons in BDD decreases non-monotonically with boron doping concentration, revealing pronounced phonon softening [8]. At low boron doping, which in our case is up to ∼0.008 at.% (80 ppm), an increase in boron content is accompanied by low-frequency shift and broadening of the F 2g Raman band of BDD caused by an increase in the lattice constant and disorder [9][10][11] similarly to the case of nitrogen doping of diamond [12].…”

Section: Introductionmentioning

confidence: 99%

Temperature dependence of growth-sector-dependent Raman spectra of boron-doped diamonds synthesized at high-pressure high-temperature

Nikolenko,

Strelchuk,

Danylenko

et al. 2023

J. Phys.: Condens. Matter

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Single crystals of boron-doped diamond (BDD) were synthesized by the temperature gradient method in high-pressure and high-temperature conditions (HPHT) in the Fe-Al-B-C system, and multisectoral diamond plates were extracted. Temperature-dependent (77-600 K) high-resolution Raman spectroscopic studies have been carried out to investigate the behavior of anharmonic phonon decay in the {001}, {113}, and {111} growth sectors of multisectoral diamond plates with different content of boron impurities (≤80 ppm) and compare with the data for undoped IIa diamond. Micro-Fourier transform infrared (FTIR) spectroscopy was used to estimate the spatial distribution of uncompensated boron impurity [Na-Nd] in BDD plates by analyzing boron-related absorption peaks. The plates were shown to have non-uniform growth-sector-dependent content of uncompensated boron impurity in the range from 1.1 × 1018 to 1.4 × 1019 cm-3. The effects of anharmonic decay (damping) of optical phonons in BDD are studied by modeling the temperature dependence of phonon frequency and linewidth of the diamond’s F2g and boron-induced vibrational modes. The extrapolated zero-temperature optical phonon linewidth and frequency and the anharmonic nature of their linear relationship are determined as a function of the growth sector and boron doping. The predominant mechanisms and parameters of the anharmonic decay of optical phonons are determined, which is of fundamental importance for the thermal conductivity of semiconductor materials. The anharmonic phonon decay remained the predominant process at higher temperatures, irrespective of the doping level.

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Effects of Boron Doping on the Bulk and Surface Acoustic Phonons in Single-Crystal Diamond

Cited by 8 publications

References 62 publications

Cryogenic characteristics of graphene composites—evolution from thermal conductors to thermal insulators

Cryogenic characteristics of graphene composites—evolution from thermal conductors to thermal insulators

Interference-induced surface superconductivity: Enhancement by tuning the Debye energy

Temperature dependence of growth-sector-dependent Raman spectra of boron-doped diamonds synthesized at high-pressure high-temperature

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