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Field Emission Properties of Needle Shaped GaN Nanorod Arrays
김화목,우영덕,김득영,이호상,홍진표,정관수,김석일,류성룡,강태원 한국물리학회 2004 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.45 No.3
We demonstrate the very simple realization of field emission devices by using needle-shaped GaN nanorods grown by hydride vapor phase epitaxy. For real device fabrication and mass production, we fabricated high-density nanorod arrays. The electron emission turn-on eld (Eto) was about 0.5 V/m, and total current was 4.45 mA at 2.06 V/m (current density, J = 54 A/cm2). A uniform "Q" character emission image with high stability was obtained from GaN nanorod-array electron emitters. The electron emission properties of GaN nanorod arrays were comparable with (or even with a lower turn-on voltage than) those of carbon nanotubes.
강성표(Sung-Pyo Kang),김정관(Jung-Kwan Kim),한재국(Jae-Kook Han),성준혁(Joon-Hyuck Sung) 대한설비공학회 2010 대한설비공학회 학술발표대회논문집 Vol.2010 No.11
Energy conservation is one of the most important issues in recent years. According to this trend, the requirement of high-efficient inverter also is increasing nowadays and government tries to localizing the high-efficient inverter. Therefore, our company is proceeding the development of high-efficient DC inverter to apply Hybrid Heat Pump by government project. Most of popular inverter using in industries is AC type inverter. DC type inverter is superior to AC inverter in view of self efficiency as 98% comparing to 80~85% of AC inverter and control precision rate as 0.1%. However, the price is more expensive than AC inverter, so it is recovering by the effort of cost reduction and technology development.