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Title: Grain boundary dominated electrical conductivity in ultrananocrystalline diamond

Abstract

Here, N-type electrically conductive ultrananocrystalline diamond (UNCD) films were deposited using the hot filament chemical vapor deposition technique with a gas mixture of H 2, CH 4 and NH 3. Depending on the deposition temperature and ammonia feed gas concentration, which serves as a nitrogen source, room temperature electrical conductivities in the order of 10 –2 to 5 × 10 1S/cm and activation energies in the meV range were achieved. In order to understand the origin of the enhanced electrical conductivity and clarify the role of ammonia addition to the process gas, a set of UNCD films was grown by systematically varying the ammonia gas phase concentration. These samples were analyzed with respect to their morphology and electrical properties as well as their carbon and nitrogen bonding environments. Temperature dependent electrical conductivity measurements (300–1200 K) show that the electrical conductivity of the samples increases with temperature. The near edge x-ray absorption fine structure measurements reveal that the electrical conductivity of the UNCD films does not correlate directly with ammonia addition, but depends on the total amount of sp2 bonded carbon in the deposited films.

Authors:
 [1];  [1]; ORCiD logo [1];  [1];  [2];  [3];  [3];  [3];  [4]
  1. Ulm Univ., Ulm (Germany)
  2. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Univ. of California, Irvine, CA (United States)
  3. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  4. SLAC National Accelerator Lab., Menlo Park, CA (United States)
Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1408101
Grant/Contract Number:
AC02-76SF00515; FKZ 16SV5320K
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Journal of Applied Physics
Additional Journal Information:
Journal Volume: 122; Journal Issue: 14; Journal ID: ISSN 0021-8979
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

Wiora, Neda, Mertens, Michael, Bruhne, Kai, Fecht, Hans -Jorg, Tran, Ich C., Willey, Trevor, van Buuren, Anthony, Biener, Jurgen, and Lee, Jun -Sik. Grain boundary dominated electrical conductivity in ultrananocrystalline diamond. United States: N. p., 2017. Web. doi:10.1063/1.4993442.
Wiora, Neda, Mertens, Michael, Bruhne, Kai, Fecht, Hans -Jorg, Tran, Ich C., Willey, Trevor, van Buuren, Anthony, Biener, Jurgen, & Lee, Jun -Sik. Grain boundary dominated electrical conductivity in ultrananocrystalline diamond. United States. doi:10.1063/1.4993442.
Wiora, Neda, Mertens, Michael, Bruhne, Kai, Fecht, Hans -Jorg, Tran, Ich C., Willey, Trevor, van Buuren, Anthony, Biener, Jurgen, and Lee, Jun -Sik. Mon . "Grain boundary dominated electrical conductivity in ultrananocrystalline diamond". United States. doi:10.1063/1.4993442.
@article{osti_1408101,
title = {Grain boundary dominated electrical conductivity in ultrananocrystalline diamond},
author = {Wiora, Neda and Mertens, Michael and Bruhne, Kai and Fecht, Hans -Jorg and Tran, Ich C. and Willey, Trevor and van Buuren, Anthony and Biener, Jurgen and Lee, Jun -Sik},
abstractNote = {Here, N-type electrically conductive ultrananocrystalline diamond (UNCD) films were deposited using the hot filament chemical vapor deposition technique with a gas mixture of H2, CH4 and NH3. Depending on the deposition temperature and ammonia feed gas concentration, which serves as a nitrogen source, room temperature electrical conductivities in the order of 10–2 to 5 × 101S/cm and activation energies in the meV range were achieved. In order to understand the origin of the enhanced electrical conductivity and clarify the role of ammonia addition to the process gas, a set of UNCD films was grown by systematically varying the ammonia gas phase concentration. These samples were analyzed with respect to their morphology and electrical properties as well as their carbon and nitrogen bonding environments. Temperature dependent electrical conductivity measurements (300–1200 K) show that the electrical conductivity of the samples increases with temperature. The near edge x-ray absorption fine structure measurements reveal that the electrical conductivity of the UNCD films does not correlate directly with ammonia addition, but depends on the total amount of sp2 bonded carbon in the deposited films.},
doi = {10.1063/1.4993442},
journal = {Journal of Applied Physics},
number = 14,
volume = 122,
place = {United States},
year = {Mon Oct 09 00:00:00 EDT 2017},
month = {Mon Oct 09 00:00:00 EDT 2017}
}

Journal Article:
Free Publicly Available Full Text
This content will become publicly available on October 9, 2018
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