Study of the electron field emission and microstructure correlation in nanocrystalline carbon thin films

S. Gupta, B. L. Weiss, B. R. Weiner, G. Morell

Research output: Contribution to journalArticle

39 Citations (Scopus)

Abstract

Nanocrystalline carbon thin films were deposited by hot-filament chemical vapor deposition using a 2% concentration of methane in hydrogen. The films were deposited on molybdenum substrates under various substrate biasing conditions. A positive bias produced a continuous flow of electrons from the filament onto the substrate, while a negative bias caused the substrate to be bombarded with positive ions. Films were also grown under no bias, for comparison. Differences in the electron field emission properties (turn-on fields and emitted currents) of these films were characterized. Correspondingly, microstructural differences were also studied, as characterized with atomic force microscopy and Raman spectroscopy. Films grown under electron bombardment showed lower turn-on fields, smoother surfaces, and smaller grains than those grown under ion bombardment or no bias. A correlation between the enhanced emission properties and the nanocrystalline carbon material produced by the low-energy particle bombardment was found through the parameters obtained using spectroscopic ellipsometry modeling. The results confirm the significant role of defects on the electron field emission mechanism.

Original languageEnglish (US)
Pages (from-to)5671-5675
Number of pages5
JournalJournal of Applied Physics
Volume89
Issue number10
DOIs
StatePublished - May 15 2001

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electron emission
field emission
microstructure
carbon
thin films
bombardment
filaments
electron bombardment
particle energy
positive ions
ellipsometry
molybdenum
methane
Raman spectroscopy
vapor deposition
atomic force microscopy
defects
hydrogen
spectroscopy
ions

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

Cite this

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abstract = "Nanocrystalline carbon thin films were deposited by hot-filament chemical vapor deposition using a 2{\%} concentration of methane in hydrogen. The films were deposited on molybdenum substrates under various substrate biasing conditions. A positive bias produced a continuous flow of electrons from the filament onto the substrate, while a negative bias caused the substrate to be bombarded with positive ions. Films were also grown under no bias, for comparison. Differences in the electron field emission properties (turn-on fields and emitted currents) of these films were characterized. Correspondingly, microstructural differences were also studied, as characterized with atomic force microscopy and Raman spectroscopy. Films grown under electron bombardment showed lower turn-on fields, smoother surfaces, and smaller grains than those grown under ion bombardment or no bias. A correlation between the enhanced emission properties and the nanocrystalline carbon material produced by the low-energy particle bombardment was found through the parameters obtained using spectroscopic ellipsometry modeling. The results confirm the significant role of defects on the electron field emission mechanism.",
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Study of the electron field emission and microstructure correlation in nanocrystalline carbon thin films. / Gupta, S.; Weiss, B. L.; Weiner, B. R.; Morell, G.

In: Journal of Applied Physics, Vol. 89, No. 10, 15.05.2001, p. 5671-5675.

Research output: Contribution to journalArticle

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AU - Gupta, S.

AU - Weiss, B. L.

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AB - Nanocrystalline carbon thin films were deposited by hot-filament chemical vapor deposition using a 2% concentration of methane in hydrogen. The films were deposited on molybdenum substrates under various substrate biasing conditions. A positive bias produced a continuous flow of electrons from the filament onto the substrate, while a negative bias caused the substrate to be bombarded with positive ions. Films were also grown under no bias, for comparison. Differences in the electron field emission properties (turn-on fields and emitted currents) of these films were characterized. Correspondingly, microstructural differences were also studied, as characterized with atomic force microscopy and Raman spectroscopy. Films grown under electron bombardment showed lower turn-on fields, smoother surfaces, and smaller grains than those grown under ion bombardment or no bias. A correlation between the enhanced emission properties and the nanocrystalline carbon material produced by the low-energy particle bombardment was found through the parameters obtained using spectroscopic ellipsometry modeling. The results confirm the significant role of defects on the electron field emission mechanism.

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