Low-field electron emission properties from intrinsic and S-incorporated nanocrystalline carbon thin films grown by hot-filament CVD

S. Gupta, B. R. Weiner, B. L. Weiss, G. Morell, Kenyetta Johnson, Oscar O. Oritz

Research output: Contribution to journalConference article

1 Scopus citations

Abstract

Results are reported on the electron field emission properties of intrinsic and S-incorporated nanocrystalline carbon (n-C:S) thin films grown on molybdenum substrates by hot-filament CVD technique from methane-hydrogen (CH4/H2) and hydrogen sulphide-hydrogen (H2S/H2) gas pre mixtures respectively. The field emission properties for the S-incorporated films were investigated as a function of substrate temperature (Ts). Lowest turn-on field was observed at 4.5 V/μm for one of the sample, which was grown at 900 °C, demonstrating the effect of sulfur addition. The S-incorporation also causes microstructural and structural changes, as characterized with ex situ techniques such as SEM, AFM and Raman spectroscopy (RS). S-assisted films show smoother surfaces and finer-grained than those grown without it. The electron field emission properties of S-assisted films is also compared to the film grown without it (intrinsic) at a particular deposition temperature and the turn-on field was found to be almost half for the S-assisted film than for the non S-assisted film. The influence of growth temperature was also conducted and an inverse correlation was found with the turn-on field (Ec). These studies were performed in order attempt to "tailor-the-material" as a viable cold cathode material by introducing the defects and altering the electronic structure.

Original languageEnglish (US)
Pages (from-to)F1621-F1626
JournalMaterials Research Society Symposium - Proceedings
Volume638
StatePublished - Dec 1 2001
EventMicrocrystalline and Nanocrystalline Semiconductors 2000 - Boston, MA, United States
Duration: Nov 27 2000Nov 30 2000

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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