Surface science of diamond: Familiar and amazing

Ristein, J.

doi:10.1016/j.susc.2006.01.087

Cited by 106 publications

(76 citation statements)

References 51 publications

(59 reference statements)

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“…[100] surface exposed to hydrogen is 2x1:H with 4 H atoms on 2 classic [100] cubic unit cell [20,43,44], while the 1x1:2H unit cell is unstable due to mutual steric repulsion between the hydrogen atoms. The stable structure of the [111] surface is the 1x1:H and can be terminated either by C-H groups [20,44] or by C-H 3 methyl groups [45,46], increasing substantially the hydrogen surface density.…”

Section: Thermal Boundary Conductancementioning

confidence: 99%

“…The stable structure of the [111] surface is the 1x1:H and can be terminated either by C-H groups [20,44] or by C-H 3 methyl groups [45,46], increasing substantially the hydrogen surface density. Using the conservative assumption that the [111] 1x1:H surface is only C-H terminated, the potential hydrogen adsorption on it is higher by a factor 2/ √ 3, i. e. a difference of 15%.…”

Section: Thermal Boundary Conductancementioning

confidence: 99%

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Effect of diamond surface orientation on the thermal boundary conductance between diamond and aluminum

Monachon

Weber

2013

Diamond and Related Materials

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Abstract[100] and [111] oriented diamond substrates were treated using Ar:H and Ar:O plasma treatments, and 1:1 HNO 3 :H 2 SO 4 heated at 200˚C. Subsequent to these treatments, an aluminum layer was either evaporated or sputtered on the substrates. The Thermal Boundary Conductance (TBC) as well as the interfacial acoustical reflection coefficient between this layer and the diamond substrate was then measured using a Time Domain ThermoReflectance (TDTR) experiment. For the Ar:H plasma treated surfaces the [111] oriented faces exhibited conductances 40 % lower than the [100] oriented ones, with the lowest measured TBC at 32±5 MWm −2 K −1 . The treatments that led to oxygen-terminated diamond surfaces (i.e. acid or Ar:O plasma treatments) showed no TBC anisotropy and the highest measured value was 230±25 MWm −2 K −1 for samples treated with Ar:O plasma with a sputtered Al layer on top. Sputtered layers on oxygen-terminated surfaces showed systematically higher TBC than their evaporated counterparts. The interfacial acoustic reflection coefficient correlated qualitatively with TBC when comparing samples with the same type of surface terminations (O or H), but this correlation failed when comparing H and O terminated interfaces with each other.

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Section: Thermal Boundary Conductancementioning

confidence: 99%

Section: Thermal Boundary Conductancementioning

confidence: 99%

Effect of diamond surface orientation on the thermal boundary conductance between diamond and aluminum

Monachon

Weber

2013

Diamond and Related Materials

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“…In this respect, diamond is ideal. It presents a simple symmetrical structure of sp3-bonded carbon atoms while being also a material of enormous interest in science and technology [11][12][13][14][15][16][17] . Furthermore, diamond exhibits an unusual mode of carbon removal from the surface when excited by photons of energy approaching the bandgap.…”

mentioning

confidence: 99%

Two-photon polarization-selective etching of emergent nano-structures on diamond surfaces

2014

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Optical techniques have advanced considerably in recent years to enable processing of surfaces with a resolution less than the wavelength of light. Despite the highly selective nature of light-matter interactions, however, efforts to increase resolution to the scale of single atoms are hampered by rapid and efficient dissipation of the absorbed energy to the surrounding matrix. Here we show that two-photon surface excitation using ultraviolet light provides a method for selectively removing carbon from diamond surfaces. Polished surfaces etched by this method develop ultra-deep subwavelength structures with morphologies dependent on the polarization of the incident laser with respect to the crystal axes. As well as revealing a practical and versatile method for nano-patterning of diamond surfaces, we show that the results comprise mesoscopic evidence for bond scission via a highly localized optical interaction that may lead to the development of new optical approaches for ultra-nanoscale (o10 nm) surface structuring.

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“…Numerous experiments have shown that hydrogen--terminated CVD diamond reveals a p-type conductivity. Two-dimensional hole conductivity is an interesting phenomenon for surface science [3], as it can be applied for fabrication of novel electronic devices such as field-effect transistors, chemical sensors and biosensors [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

High Temperature Surface Conductivity of Hydrogenated Diamond Films Exposed to Humid Air

2010

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Surface conductivity of thin diamond films was measured as a function of temperature up to 450• C. Hydrogenated diamond was synthesized by chemical vapor deposition in hydrogen/carbon plasma. Low values of charge carrier activation energy (≈ 10 meV) were observed, when hydrogenated diamond films were exposed to the ambient humid air. However, the activation energy increased by two orders of magnitude as film temperature exceeded 300• C. We have attributed this behavior to the desorption of the H2O adlayer. The jump of the activation energy did not occur, when experiment was performed in vacuum. We have also shown that donor doping leads to the up-shift of the Fermi level much above the acceptor-like band gap levels induced by surface C-H bonds, which cannot be compensated by transfer of electrons from diamond to the double H-H2O layer.

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Surface science of diamond: Familiar and amazing

Cited by 106 publications

References 51 publications

Effect of diamond surface orientation on the thermal boundary conductance between diamond and aluminum

Effect of diamond surface orientation on the thermal boundary conductance between diamond and aluminum

Two-photon polarization-selective etching of emergent nano-structures on diamond surfaces

High Temperature Surface Conductivity of Hydrogenated Diamond Films Exposed to Humid Air

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