Annealing effect on electron field-emission properties of diamond-like nanocomposite films

Xing Zhao Ding, Dong Sheng Mao, B. K. Tay, Shu Ping Lau, J. R. Shi, Y. J. Li, Z. Sun, X. Shi, H. S. Tan, Fu Min Zhang, Xiang Huai Liu

Research output: Journal article publicationJournal articleAcademic researchpeer-review

6 Citations (Scopus)

Abstract

The field-emission properties of a Si-O bond-containing diamond-like nanocomposite (DLN) film were investigated as a function of annealing temperature (Ta). It was found that with increasing Tathe emission threshold voltage decreased gradually. After annealing at Ta= 500°C, the emission current decreased significantly. At Ta= 700°C, however, the field-emission properties of the DLN film improved greatly, the threshold field became very low (∼1.5 V/μm), and the emission current rather high (e.g., ∼2.3 μA/mm2at an electric field of 22 V/μm). The structural variation of the film after annealing at different temperatures was monitored by ultraviolet Raman spectroscopy, spectroscopic ellipsometry, atomic-force microscopy, and electrical resistivity measurements. By using a three-step model: (i) electron injection from the substrate, (ii) electron transport through the film, and (iii) electron emission at the film surface, the annealing effect on field-emission properties of the DLN film were qualitatively interpreted. It is believed that the threshold electric field is determined by the local electron affinity on the film surface, while the emission current is mainly limited by electron injection and transport processes.
Original languageEnglish
Pages (from-to)5087-5092
Number of pages6
JournalJournal of Applied Physics
Volume88
Issue number9
DOIs
Publication statusPublished - 1 Nov 2000
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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