Hydrogen assisted heat transfer during diamond growth using carbon and tantalum filaments

W. A. Yarbrough, K. Tankala, M. Mecray, Tarasankar Debroy

Research output: Contribution to journalArticle

37 Citations (Scopus)

Abstract

Much of the previous work on the role of atomic hydrogen in diamond growth has been focused on its formation on various refractory metal filaments, its reaction in the gas phase and its role in the growth mechanism. In contrast, the effect of atomic hydrogen recombination on substrate heating is addressed in this letter. Experiments were conducted in vacuum, helium, and hydrogen environments. Tantalum and carbon filaments were used to vary atomic hydrogen generation rates. Furthermore, methane was added in some experiments to determine its effect on hydrogen assisted "chemical" heating of the substrate. The results indicate that when substantial amounts of atomic hydrogen are generated at the filament, reactions of atomic hydrogen at the diamond growth surface have a pronounced effect on the substrate temperature. Use of carbon filaments lead to significantly diminished atomic hydrogen generation rates and much lower substrate temperatures. Additions of small amounts of methane to hydrogen also resulted in reduced atomic hydrogen generation rates and, consequently, lower substrate temperatures.

Original languageEnglish (US)
Pages (from-to)2068-2070
Number of pages3
JournalApplied Physics Letters
Volume60
Issue number17
DOIs
StatePublished - Dec 1 1992

Fingerprint

tantalum
filaments
heat transfer
diamonds
carbon
hydrogen
methane
hydrogen recombinations
refractory metals
heating
temperature
helium
vapor phases
vacuum

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

Cite this

Yarbrough, W. A. ; Tankala, K. ; Mecray, M. ; Debroy, Tarasankar. / Hydrogen assisted heat transfer during diamond growth using carbon and tantalum filaments. In: Applied Physics Letters. 1992 ; Vol. 60, No. 17. pp. 2068-2070.
@article{003c78cce93d4274951e2ab97cf2ebb5,
title = "Hydrogen assisted heat transfer during diamond growth using carbon and tantalum filaments",
abstract = "Much of the previous work on the role of atomic hydrogen in diamond growth has been focused on its formation on various refractory metal filaments, its reaction in the gas phase and its role in the growth mechanism. In contrast, the effect of atomic hydrogen recombination on substrate heating is addressed in this letter. Experiments were conducted in vacuum, helium, and hydrogen environments. Tantalum and carbon filaments were used to vary atomic hydrogen generation rates. Furthermore, methane was added in some experiments to determine its effect on hydrogen assisted {"}chemical{"} heating of the substrate. The results indicate that when substantial amounts of atomic hydrogen are generated at the filament, reactions of atomic hydrogen at the diamond growth surface have a pronounced effect on the substrate temperature. Use of carbon filaments lead to significantly diminished atomic hydrogen generation rates and much lower substrate temperatures. Additions of small amounts of methane to hydrogen also resulted in reduced atomic hydrogen generation rates and, consequently, lower substrate temperatures.",
author = "Yarbrough, {W. A.} and K. Tankala and M. Mecray and Tarasankar Debroy",
year = "1992",
month = "12",
day = "1",
doi = "10.1063/1.107091",
language = "English (US)",
volume = "60",
pages = "2068--2070",
journal = "Applied Physics Letters",
issn = "0003-6951",
publisher = "American Institute of Physics Publising LLC",
number = "17",

}

Hydrogen assisted heat transfer during diamond growth using carbon and tantalum filaments. / Yarbrough, W. A.; Tankala, K.; Mecray, M.; Debroy, Tarasankar.

In: Applied Physics Letters, Vol. 60, No. 17, 01.12.1992, p. 2068-2070.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Hydrogen assisted heat transfer during diamond growth using carbon and tantalum filaments

AU - Yarbrough, W. A.

AU - Tankala, K.

AU - Mecray, M.

AU - Debroy, Tarasankar

PY - 1992/12/1

Y1 - 1992/12/1

N2 - Much of the previous work on the role of atomic hydrogen in diamond growth has been focused on its formation on various refractory metal filaments, its reaction in the gas phase and its role in the growth mechanism. In contrast, the effect of atomic hydrogen recombination on substrate heating is addressed in this letter. Experiments were conducted in vacuum, helium, and hydrogen environments. Tantalum and carbon filaments were used to vary atomic hydrogen generation rates. Furthermore, methane was added in some experiments to determine its effect on hydrogen assisted "chemical" heating of the substrate. The results indicate that when substantial amounts of atomic hydrogen are generated at the filament, reactions of atomic hydrogen at the diamond growth surface have a pronounced effect on the substrate temperature. Use of carbon filaments lead to significantly diminished atomic hydrogen generation rates and much lower substrate temperatures. Additions of small amounts of methane to hydrogen also resulted in reduced atomic hydrogen generation rates and, consequently, lower substrate temperatures.

AB - Much of the previous work on the role of atomic hydrogen in diamond growth has been focused on its formation on various refractory metal filaments, its reaction in the gas phase and its role in the growth mechanism. In contrast, the effect of atomic hydrogen recombination on substrate heating is addressed in this letter. Experiments were conducted in vacuum, helium, and hydrogen environments. Tantalum and carbon filaments were used to vary atomic hydrogen generation rates. Furthermore, methane was added in some experiments to determine its effect on hydrogen assisted "chemical" heating of the substrate. The results indicate that when substantial amounts of atomic hydrogen are generated at the filament, reactions of atomic hydrogen at the diamond growth surface have a pronounced effect on the substrate temperature. Use of carbon filaments lead to significantly diminished atomic hydrogen generation rates and much lower substrate temperatures. Additions of small amounts of methane to hydrogen also resulted in reduced atomic hydrogen generation rates and, consequently, lower substrate temperatures.

UR - http://www.scopus.com/inward/record.url?scp=0001586337&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0001586337&partnerID=8YFLogxK

U2 - 10.1063/1.107091

DO - 10.1063/1.107091

M3 - Article

AN - SCOPUS:0001586337

VL - 60

SP - 2068

EP - 2070

JO - Applied Physics Letters

JF - Applied Physics Letters

SN - 0003-6951

IS - 17

ER -