Growth Technique For Large Area Mosaic Diamond Films†

1992 ◽  
Vol 242 ◽  
Author(s):  
R. W. Pryor ◽  
M. W. Geis ◽  
H. R. Clark
Keyword(s):  
Single Crystal ◽  
Electronic Properties ◽  
Diamond Films ◽  
Chemical Vapor ◽  
Polycrystalline Diamond ◽  
Growth Conditions ◽  
Large Area ◽  
Si Substrates ◽  
Single Crystal Diamond ◽  
The Individual

ABSTRACTA new technique has been developed to grow semiconductor grade diamond substrates with dimensions comparable to those of currently available Si wafers. Previously, the synthetic single crystal diamond that could be grown measured only a few millimeters across, compared with single crystal Si substrates which typically are 10 to 15 cm in diameter. In the technique described, an array of features is first etched in a Si substrate. The shape of the features matches that of inexpensive, synthetic faceted diamond seeds. A diamond mosaic is then formed by allowing the diamond seeds to settle out of a slurry onto the substrate, where they become fixed and oriented in the etched features. For the experiments reported, the mosaic consists of seeds ∼ 100 μm across on 100 μm centers. A mosaic film is obtained by chemical vapor deposition of homoepitaxial diamond until the individual seeds grow together. Although these films contain low angle (<1°) grain boundaries, smooth, continuous diamond films have been obtained with electronic properties substantially better than those of polycrystalline diamond films and equivalent to those of homoepitaxial single crystal diamond films. The influence of growth conditions and seeding procedures on the crystallographic and electronic properties of these mosaic diamond films is discussed.

Diamond Films: Recent Developments

MRS Bulletin ◽  
1998 ◽  
Vol 23 (9) ◽  
pp. 16-21 ◽  
Author(s):  
Dieter M. Gruen ◽  
Ian Buckley-Golder
Keyword(s):  
High Temperature ◽  
Integrated Circuits ◽  
Nuclear Power ◽  
Large Scale ◽  
Diamond Films ◽  
Chemical Vapor ◽  
Large Area ◽  
Technical Problems ◽  
Practical Applications ◽  
Single Crystal Diamond

Carbon in the form of diamond is the stuff of dreams, and the image of the diamond evokes deep and powerful emotions in humans. Following the successful synthesis of diamond by high-pressure methods in the 1950s, the startling development of the low-pressure synthesis of diamond films in the 1970s and 1980s almost immediately engendered great expectations of utility. The many remarkable properties of diamond due in part to its being the most atomically dense material in the universe (hardness, thermal conductivity, friction coefficient, transparency, etc.) could at last be put to use in a multitude of practical applications. “The holy grail”—it was realized early on—would be the development of large-area, doped, single-crystal diamond wafers for the fabrication of high-temperature, extremely fast integrated circuits leading to a revolution in computer technology.Excitement in the community of chemical-vapor-deposition (CVD) diamond researchers, funding agencies, and industrial companies ran high in expectation of early realization for many of the commercial goals that had been envisioned: tool, optical, and corrosion-resistant coatings; flat-panel displays; thermomanagement for electronic components, etc. Market projection predicting diamond-film sales in the billions of dollars by the year 2000 was commonplace. Hopes were dashed when these optimistic predictions ran up against the enormous scientific and technical problems that had to be overcome in order for those involved to fully exploit the potential of diamond. This experience is not new to the scientific community. One need only remind oneself of the hopes for cheap nuclear power or for high-temperature superconducting wires available at hardware stores to realize that the lag between scientific discoveries and their large-scale applications can be very long. Diamond films are in fact being used today in commercial applications.

scholarly journals Influence of the Heat Dissipation Mode of Long-Flute Cutting Tools on Temperature Distribution during HFCVD Diamond Films

Crystals ◽  
2019 ◽  
Vol 9 (8) ◽  
pp. 394
Author(s):  
Zhang ◽  
Qian ◽  
wang ◽  
Huang ◽  
Zhang ◽  
...  
Keyword(s):  
Heat Dissipation ◽  
Focal Point ◽  
Cutting Tools ◽  
Diamond Films ◽  
Chemical Vapor ◽  
Polycrystalline Diamond ◽  
Decisive Role ◽  
Diamond Coatings ◽  
The Difference ◽  
The Individual

The distribution of substrate temperature plays a decisive role on the uniformity of polycrystalline diamond films on cemented carbide tools with a long flute, prepared by a hot filament chemical vapor deposition (HFCVD). In this work, the heat dissipation mode at the bottom of tools is a focal point, and the finite volume method (FVM) is conducted to simulate and predict the temperature field of tools, with the various materials of the holder placed under the tools. The simulation results show that the thermal conductivity of the holder affects the temperature difference of the individual tools greatly, but only affects the temperature of different tools at the same XY plane slightly. Moreover, the ceramic holder can reduce the difference in temperature of an individual tool by 54%, compared to a copper one. Afterwards, the experiments of the deposition of diamond films is performed using the preferred ceramic holder. The diamond coatings on the different positions present a highly uniform distribution on their grain size, thickness, and quality.

Progress on Preferential Etching and Phosphorus Doping of Single Crystal Diamond

2014 ◽  
Vol 1634 ◽  
Author(s):  
Timothy A. Grotjohn ◽  
Dzung T. Tran ◽  
M. Kagan Yaran ◽  
Thomas Schuelke
Keyword(s):  
Substrate Temperature ◽  
Single Crystal ◽  
Epitaxial Growth ◽  
Microwave Plasma ◽  
Hydrogen Plasma ◽  
Chemical Vapor ◽  
Deposition Process ◽  
Growth Conditions ◽  
Room Temperature Resistivity ◽  
Single Crystal Diamond

ABSTRACTPhosphorus is incorporated into single crystal diamond during epitaxial growth at higher concentrations on the (111) crystallographic surface than on the (001) crystallographic surface. To form n+-type regions in diamond for semiconductor devices it is beneficial to deposit on the (111) surface. However, diamond deposition is faster and of higher quality on the (001) surface. A preferential etch method is described that forms inverted pyramids on the (001) surface of a substrate diamond crystal, which opens (111) faces for improved phosphorus incorporation. The preferential etching occurs on the surface in regions where a nickel film is deposited. The etching is performed in a microwave generated hydrogen plasma operating at 160 Torr with the substrate temperature in the range of 800-950 °C. The epitaxial growth of diamond with high phosphorus concentrations exceeding 1020 cm-3 is performed using a microwave plasma-assisted chemical vapor deposition process. Successful growth conditions were achieved with a feedgas mixture of 0.25% methane, 500 ppm phosphine and hydrogen at a pressure of 160 Torr and a substrate temperature of 950-1000°C. The room temperature resistivity of the phosphorus-doped diamond is 120-150 Ω-cm and the activation energy is 0.027 eV.

Morphologic study of (100) single crystal diamond films epitaxially grown by chemical vapor deposition

1993 ◽  
Vol 132 (1-2) ◽  
pp. 200-204 ◽  
Author(s):  
Z.M. Zhang ◽  
H.M. Cheng ◽  
S.H. Li ◽  
Q.Y. Cai ◽  
D.L. Ling ◽  
...  
Keyword(s):  
Chemical Vapor Deposition ◽  
Single Crystal ◽  
Vapor Deposition ◽  
Diamond Films ◽  
Chemical Vapor ◽  
Morphologic Study ◽  
Single Crystal Diamond

Heteroepitaxial Nucleation of Diamond

1995 ◽  
Vol 416 ◽  
Author(s):  
B. R. Stoner ◽  
P. J. Ellis ◽  
M. T. Mcclure ◽  
S. D. Wolter
Keyword(s):  
Single Crystal ◽  
Electronic Transport ◽  
Diamond Films ◽  
Heteroepitaxial Growth ◽  
Large Area ◽  
Diamond Nucleation ◽  
Single Crystal Diamond ◽  
Single Crystal Films ◽  
Crystal Films

ABSTRACTThe heteroepitaxial nucleation and eventual growth of large area single crystal diamond films has long eluded researchers interested in tapping it's many enabling properties, specifically in the field of active electronics. The uncertainty surrounding the diamond nucleation mechanism(s) and corresponding inability to carefully control this process are often blamed for the difficulty in achieving true heteroepitaxial growth. Biasenhanced nucleation (BEN) has been shown to provide in-situ control of the nucleation process. Subsequent advancements in both nucleation and deposition stages has resulted in highly oriented diamond films, approaching single crystal quality yet still plagued by arrays of medium to low angle grain boundaries that can degrade the electronic transport properties. To further improve upon these results and achieve large area, single crystal films it is believed that development must focus on the more fundamental problems of diamond nucleation. This paper presents a review of recent progress pertaining to the bias-enhanced process and focuses on data specific to the epitaxial nucleation dilemma.

Epitaxial Growth of CdTe on (100) GaAs/Si and (111) GaAs/Si Substrates Using Molecular Beam Epitaxy and Metalorganic Chemical Vapor Deposition

1987 ◽  
Vol 102 ◽  
Author(s):  
G. Radhakrishnan ◽  
A. Nouhi ◽  
J. Katz
Keyword(s):  
Single Crystal ◽  
Vapor Deposition ◽  
Metalorganic Chemical Vapor Deposition ◽  
Molecular Beam ◽  
Chemical Vapor ◽  
Large Area ◽  
Lattice Match ◽  
Si Substrates ◽  
Device Processing ◽  
Metalorganic Chemical

CdTe is a very important semiconductor with versatile applications extending from solar energy conversion to optoelectronics. In addition, both the close lattice match between CdTe and HgCdTe and the immunity of CdTe to autodoping of the HgCdTe make CdTe the substrate of choice for the growth of HgCdTe. However, CdTe is extremely difficult to grow and the nonavailability of good quality, large area, inexpensive, single crystal CdTe has slowed the development of HgCdTe detectors. Infrared device processing requires large areas of single crystal material and the problems associated with CdTe have called for alternative substrates for growing HgCdTe.

scholarly journals Effect of Substrate Holder Design on Stress and Uniformity of Large-Area Polycrystalline Diamond Films Grown by Microwave Plasma-Assisted CVD

Coatings ◽  
2020 ◽  
Vol 10 (10) ◽  
pp. 939
Author(s):  
Vadim Sedov ◽  
Artem Martyanov ◽  
Alexandr Altakhov ◽  
Alexey Popovich ◽  
Mikhail Shevchenko ◽  
...  
Keyword(s):  
Microwave Plasma ◽  
Chemical Vapor ◽  
Polycrystalline Diamond ◽  
Deposition Process ◽  
Laser Flash ◽  
The Novel ◽  
Substrate Holder ◽  
Large Area ◽  
Si Substrates ◽  
Laser Flash Technique

In this work, the substrate holders of three principal geometries (flat, pocket, and pedestal) were designed based on E-field simulations. They were fabricated and then tested in microwave plasma-assisted chemical vapor deposition process with the purpose of the homogeneous growth of 100-μm-thick, low-stress polycrystalline diamond film over 2-inch Si substrates with a thickness of 0.35 mm. The effectiveness of each holder design was estimated by the criteria of the PCD film quality, its homogeneity, stress, and the curvature of the resulting “diamond-on-Si” plates. The structure and phase composition of the synthesized samples were studied with scanning electron microscopy and Raman spectroscopy, the curvature was measured using white light interferometry, and the thermal conductivity was measured using the laser flash technique. The proposed pedestal design of the substrate holder could reduce the stress of the thick PCD film down to 1.1–1.4 GPa, which resulted in an extremely low value of displacement for the resulting “diamond-on-Si” plate of Δh = 50 μm. The obtained results may be used for the improvement of already existing, and the design of the novel-type, MPCVD reactors aimed at the growth of large-area thick homogeneous PCD layers and plates for electronic applications.

Electronic Structure of Polycrystalline PECVD Diamond Surfaces

1995 ◽  
Vol 416 ◽  
Author(s):  
T. P. Humphreys ◽  
D. P. Malta ◽  
R. E. Thomas ◽  
J. B. Posthill ◽  
M. J. Mantini ◽  
...  
Keyword(s):  
Electronic Structure ◽  
Electron Emission ◽  
Hydrogen Plasma ◽  
High Vacuum ◽  
Diamond Films ◽  
Chemical Vapor ◽  
Polycrystalline Diamond ◽  
Low Energy ◽  
Diamond Surfaces ◽  
Single Crystal Diamond

ABSTRACTUltraviolet and X-ray photoelectron spectroscopy techniques have been employed in a preliminary study of the electronic structure of polycrystalline diamond films that have been grown on Si substrates by if-plasma enhanced chemical vapor deposition using water/ethanol growth chemistries. In particular, polycrystalline diamond films with distinctly different surface morphologies and Raman scattering characteristics have been investigated. Corresponding ultraviolet photoemission spectra from air-exposed samples have shown the presence of a prominent low-energy secondary electron emission peak indicative of a negative electron affinity (NEA) surface. Chemical stability of the polycrystalline diamond NEA surface has been demonstrated following conventional acid cleans and hydrogen plasma processing. In contrast, an oxygen (20%)/Ar plasma exposure has been shown to extinguish the photoemission of low-energy secondary electrons and remove the NEA. However, by employing a high-temperature anneal at 750 °C for 15 min in ultra-high vacuum the NEA surface can be restored. Compared to NEA single crystal diamond surfaces the photoexcited low-energy electron emission from chemical vapor deposited polycrystalline diamond films is more robust.

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