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• W2044764544 abstract "We have investigated the field emission properties of diamond films grown under substrate bias conditions in a microwave plasma chemical vapor deposition system, with a substrate temperature of 800 °C, microwave power of 600 W, and a total pressure of 11 Torr. One group of films was grown with a substrate bias of −100 V in gas mixtures of 1% N2 and 1%–20% CH4 in H2, while a second group of films was grown with a substrate bias ranging from +100 to −150 V in a gas mixture of 1%N2–10%CH4–89%H2. The field emission performance in terms of threshold field and emission current improved considerably as a function of increasing CH4 concentration and negative bias voltage. Ultraviolet Raman analysis showed that the field emission enhancement resulting from an increase in CH4 concentration from 1% to 5% correlates with a decrease in the sp3 bonding character in the diamond film. The dependence of field emission on negative bias voltage appears to be correlated with ion bombardment-induced damage in the film during growth. The scanning electron microscopy image of the film grown with −150 V bias showed: smaller surface topographic features as compared to films grown under 0 and +100 V bias. The film grown with a bias of −150 V showed the lowest threshold field (∼2.0 V/μm) corresponding to an emission current density of 12.7 μA/cm2. J vs E0 measurements across a length of 40 mm over the film showed a uniform threshold field (2.0±0.55 V/μm). The film grown with a positive bias (+100 V) showed a relatively poor field emission performance." @default.
• W2044764544 created "2016-06-24" @default.
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• W2044764544 date "1999-03-01" @default.
• W2044764544 modified "2023-10-11" @default.
• W2044764544 title "Studies of field emission from bias-grown diamond thin films" @default.
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• W2044764544 doi "https://doi.org/10.1116/1.590623" @default.
• W2044764544 hasPublicationYear "1999" @default.
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