Field emission devices employing enhanced diamond field emitters
First Claim
1. A method for making a diamond field emitter comprising the steps of:
- providing a substrate;
growing diamond material on said substrate in the form of diamond islands less than 10 μ
m in diameter, said diamond material grown by CVD deposition of a gas consisting of more than 2 atomic percent of carbon in hydrogen at a temperature less than 900°
C., whereby said diamond material is grown as diamond characterized by a broadband diamond peak at K=1332 cm-1 in Raman spectroscopy with a full width at half maximum in the range 7-11 cm-1 ;
said diamond material emitting electrons in a current density of at least 0.1 mA/mm2 at an applied field of 25 V/μ
m or less.
8 Assignments
0 Petitions
Accused Products
Abstract
Applicants have discovered methods for making, treating and using diamonds which substantially enhance their capability for low voltage emission. Specifically, applicants have discovered that defect-rich diamonds--diamonds grown or treated to increase the concentration of defects--have enhanced properties of low voltage emission. Defect-rich diamonds are characterized in Raman spectroscopy by a diamond peak at 1332 cm-1 broadened by a full width at half maximum ΔK in the range 5-15 cm-1 (and preferably 7-11 cm-1). Such defect-rich diamonds can emit electron current densities of 0.1 mA/mm2 or more at a low applied field of 25 V/μm or less. Particularly advantageous structures use such diamonds in an array of islands or particles each less than 10 μm in diameter at fields of 15 V/μm or less.
6 Citations
8 Claims
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1. A method for making a diamond field emitter comprising the steps of:
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providing a substrate; growing diamond material on said substrate in the form of diamond islands less than 10 μ
m in diameter, said diamond material grown by CVD deposition of a gas consisting of more than 2 atomic percent of carbon in hydrogen at a temperature less than 900°
C., whereby said diamond material is grown as diamond characterized by a broadband diamond peak at K=1332 cm-1 in Raman spectroscopy with a full width at half maximum in the range 7-11 cm-1 ;said diamond material emitting electrons in a current density of at least 0.1 mA/mm2 at an applied field of 25 V/μ
m or less. - View Dependent Claims (2, 3, 4)
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5. A method for making a diamond field emitter comprising the step of:
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providing a substrate having diamond material thereon; and growing on said diamond material an additional layer of diamond electron emitting material characterized by a diamond peak at 1332 cm-1 in Raman spectroscopy broadened to a full width at half maximum in the range 7-11 cm-1, thereby growing a diamond material emitting electron in a current density of at least 0.1 mA/mm2 at an applied field of 25V/μ
m or less. - View Dependent Claims (6)
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7. A method for making a diamond field emitter comprising the steps of:
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providing a substrate having diamond material thereon; and bombarding said diamond material with particles to broaden the diamond peak at 1332 cm-1 in Raman spectroscopy to a full width at half maximum in the range 5-15 cm-1. - View Dependent Claims (8)
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Specification