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Title: | Origin of Conductive Nanocrystalline Diamond Nanoneedles for Optoelectronic Applications | Authors: | KAMATCHI JOTHIRAMALINGAM, Sankaran Yeh, Chien-Jui Hsieh, Ping-Yen POBEDINSKAS, Paulius Kunuku, Srinivasu Leou, Keh-Chyang Tai, Nyan-Hwa Lin, I-Nan HAENEN, Ken |
Issue Date: | 2019 | Publisher: | AMER CHEMICAL SOC | Source: | ACS APPLIED MATERIALS & INTERFACES, 11(28), p. 25388-25398 | Abstract: | Microstructural evolution of nanocrystalline diamond (NCD) nanoneedles owing to the addition of methane and nitrogen in the reactant gases is systematically addressed. It has been determined that varying the concentration of CH4 in the CH4/H-2/N-2 plasma is significant to tailor the morphology and microstructure of NCD films. While NCD films grown with 1% CH4 in a CH4/H-2/N-2 (3%) plasma contain large diamond grains, the microstructure changed considerably for NCD films grown using 5% (or 10%) CH4, ensuing in nanosized diamond grains. For 15% CH4-grown NCD films, a well-defined nanoneedle structure evolves. These NCD nanoneedle films contain spa phase diamond, sheathed with sp(2)-bonded graphitic phases, achieving a low resistivity of 90 Omega cm and enhanced field electron emission (FEE) properties, namely, a low turn-on field of 4.3 V/mu m with a high FEE current density of 3.3 mA/cm(2) (at an applied field of 8.6 V/mu m) and a significant field enhancement factor of 3865. Furthermore, a microplasma device utilizing NCD nanoneedle films as cathodes can trigger a gas breakdown at a low threshold field of 3600 V/cm attaining a high plasma illumination current density of 1.14 mA/cm(2) at an applied voltage of 500 V, and a high plasma lifetime stability of 881 min is evidenced. The optical emission spectroscopy studies suggest that the C-2, CN, and CH species in the growing plasma are the major causes for the observed microstructural evolution in the NCD films. However, the increase in substrate temperature to similar to 80 degrees C due to the incorporation of 15% CH4 in the CH4/H-2/N-2 plasma is the key driver resulting in the origin of nanoneedles in NCD films. The outstanding optoelectronic characteristics of these nanoneedle films make them suitable as cathodes in high-brightness display panels. | Notes: | [Sankaran, Kamatchi Jothiramalingam; Pobedinskas, Paulius; Haenen, Ken] Hasselt Univ, Inst Mat Res IMO, B-3590 Diepenbeek, Belgium. [Sankaran, Kamatchi Jothiramalingam; Pobedinskas, Paulius; Haenen, Ken] IMEC VZW, IMOMEC, B-3590 Diepenbeek, Belgium. [Yeh, Chien-Jui; Kunuku, Srinivasu; Leou, Keh-Chyang] Natl Tsing Hua Univ, Dept Engn & Syst Sci, Hsinchu 30013, Taiwan. [Hsieh, Ping-Yen; Tai, Nyan-Hwa] Natl Tsing Hua Univ, Dept Mat Sci & Engn, Hsinchu 30013, Taiwan. [Lin, I-Nan] Tamkang Univ, Dept Phys, Tamsui 251, Taiwan. | Keywords: | nanocrystalline diamond nanoneedles; electrical resistivity; field electron emission; plasma illumination; microstructural evolution; transmission electron microscopy; optical emission spectroscopy;evolution; transmission electron microscopy; optical emission spectroscopy | Document URI: | http://hdl.handle.net/1942/29178 | ISSN: | 1944-8244 | e-ISSN: | 1944-8252 | DOI: | 10.1021/acsami.9b05469 | ISI #: | 000476684900059 | Rights: | 2019 American Chemical Society | Category: | A1 | Type: | Journal Contribution | Validations: | ecoom 2020 |
Appears in Collections: | Research publications |
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File | Description | Size | Format | |
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sankaran 1.pdf Restricted Access | Published version | 5.19 MB | Adobe PDF | View/Open Request a copy |
Revised Manuscript.pdf | Peer-reviewed author version | 1.32 MB | Adobe PDF | View/Open |
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