Formation Mechanism of p-Type Surface Conductive Layer on Deposited Diamond Films

Gi, Ri Sung; Mizumasa, Tatsuhiro; Akiba, Yukio; Hirose, Yoichi; Kurosu, Takeshi; Iida, Masamori

doi:10.1143/jjap.34.5550

Cited by 151 publications

(58 citation statements)

References 12 publications

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“…Although the development is still at a very early stage, these properties together with recent advances in chemical vapour deposition (CVD) diamond growth has enabled the demonstration of some devices with promising future prospects, e.g. : high voltage 1 and high temperature 2 diodes, x-ray sensors 3 transfer-doped 4,5 and delta-doped 6 field effect transistors. The utilization of spin states in diamond defects for quantum computing 7 and magnetic field sensors 8 are also topics that have recently attracted strong attention.…”

Section: Introductionmentioning

confidence: 99%

Effective masses and electronic structure of diamond including electron correlation effects in first principles calculations using the GW-approximation

et al. 2011

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We present calculated interband transitions and effective masses for diamond from first principles including electron correlation effects via the GW-approximation. Our findings are in agreement with experiments, already the first iteration of the GW-scheme gives a direct gap at the gamma-point of 7.38 eV and a indirect gap of 5.75 eV close to experimental values. For deeper bands a quasiparticle self-consistent method is necessary to accurately reproduce the valence band width to 23.1 eV. We also obtain effective hole masses along different symmetry axes and electron conduction masses, ml = 1.1m0 and mt = 0.22m0

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Section: Introductionmentioning

confidence: 99%

Effective masses and electronic structure of diamond including electron correlation effects in first principles calculations using the GW-approximation

et al. 2011

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“…It is thought that holes are created in the near-surface region by electron out diffusion into adsorbates in a water, or similar, layer at the diamond surface. 10,21,22 These holes are also confined to the near surface by the negative charge at the carbon atom in the dipole. As the diamond is cooled, the holes have less thermal energy and hence become increasingly confined at the surface by the dipole.…”

Section: Discussionmentioning

confidence: 99%

“…3,4 High performance devices have been fabricated utilizing this surface conductive layer; [5][6][7][8][9] however its origin is still under debate. [10][11][12][13] As it is not a dopant in the conventional sense, control over the carrier transport values to date has been elusive. Moderate success has been achieved by moderate annealing treatments in air to partially oxidize the surface, but this also increases the sheet resistivity which is obviously undesirable for device applications.…”

Section: Introductionmentioning

confidence: 99%

Homoepitaxial diamond growth for the control of surface conductive carrier transport properties

Williams

Jackman

2004

Journal of Applied Physics

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Growth of high quality diamond for surface conductive device applications is demonstrated. Mobility values higher than 140 cm 2 V −1 s −1 at sheet carrier concentrations of 2.5ϫ 10 12 cm −2 were achieved using a high growth rate process. Furthermore, control over the carrier transport statistics is demonstrated on both single crystal and polycrystalline diamond. This process allows the production of high quality electronic grade diamond with ability to tune carrier transport statistics. The mechanism behind this process is discussed.

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“…32 In earlier studies, undoped diamond films of perfect crystallinity were used, and the conductivity of those films was assigned to unknown structural defects caused by the temperature during film deposition. 33, 34 Gi et al 35 observed a decrease in the resistance of diamond while it was in contact with acid or in water vapor and ascribed this drop in resistance to the formation of a conducting surface film covered with hydrogen atoms. This p-type conductivity is characterized by a high carrier density.…”

Section: B832mentioning

confidence: 99%

Electrophoretically Fabricated Diamond Nanoparticle-Based Electrodes

Riveros

Soto

Scibioh

et al. 2010

J. Electrochem. Soc.

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Dimensionally stable, high surface area support for a possible direct methanol fuel cell application was fabricated from commercial diamond nanoparticles through electrophoretic deposition onto silicon wafer substrates, and their electrochemical characteristics were examined by employing inorganic redox probes such as ͓Fe͑CN͒ 6 ͔ 3−/4− and ͓Ru͑NH 3 ͒ 6 ͔ 3+/2+ . As-received diamond nanoparticles were purified by refluxing in an aqueous nitric acid solution, and the product was characterized by using X-ray diffraction, X-ray photoelectron spectroscopy, prompt gamma-ray neutron activation analysis, Raman spectroscopy, electron energy loss spectroscopy, and transmission electron microscopy techniques. Electrophoretically deposited diamond nanoparticle layers of uniform thickness were obtained by controlling experimental parameters, such as applied voltage, deposition time, and the concentration of diamond nanoparticles in the suspension. Platinum nanoparticles were electrodeposited onto these diamond nanoparticle layers ͑Pt/DNP͒ by step and sweep potential method. Their structural and morphological characterizations were made by using scanning electron microscopy and energy-dispersive X-ray analysis. The electrochemical activity of Pt/DNP toward methanol oxidation was studied. The present study paves a way to fabricate ultrathin, uniform, high surface area, and dimensionally stable diamond electrodes in a controllable fashion. This type of deposited diamond nanoparticle layers may be considered as catalyst support material for fuel cell applications. © 2010 The Electrochemical Society. ͓DOI: 10.1149/1.3374403͔ All rights reserved. Fuel cells attract tremendous attention in the present days as environmentally sustainable systems.1 Especially, direct methanol fuel cells are developed for transportation and portable power supply applications. In spite of the numerous demonstration systems, the commercialization is hampered due to the prohibitively high costs and durability of materials. Regarding cost reduction, the noble-metal loadings must drop to a level of Ͻ1.0 mg cm −2 from the present 2.0-8.0 mg cm −2 , depending on the applications. Loading reduction through increasing platinum utilization is one of the approaches. Non-noble catalyst development is another approach. Designing high performance electrodes would be yet another approach. Dispersing catalysts on electrically conducting, high surface area carbon materials is a significant step forward to achieve a finer dispersion of the metal catalyst and to get a high electrochemically active surface area.

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Formation Mechanism of p-Type Surface Conductive Layer on Deposited Diamond Films

Cited by 151 publications

References 12 publications

Effective masses and electronic structure of diamond including electron correlation effects in first principles calculations using the GW-approximation

Effective masses and electronic structure of diamond including electron correlation effects in first principles calculations using the GW-approximation

Homoepitaxial diamond growth for the control of surface conductive carrier transport properties

Electrophoretically Fabricated Diamond Nanoparticle-Based Electrodes

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