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Title: Rectification properties of n-type nanocrystalline diamond heterojunctions to p-type silicon carbide at high temperatures

Highly rectifying heterojunctions of n-type nanocrystalline diamond (NCD) films to p-type 4H-SiC substrates are fabricated to develop p-n junction diodes operable at high temperatures. In reverse bias condition, a potential barrier for holes at the interface prevents the injection of reverse leakage current from the NCD into the SiC and achieves the high rectification ratios of the order of 10{sup 7} at room temperature and 10{sup 4} even at 570‚ÄČK. The mechanism of the forward current injection is described with the upward shift of the defect energy levels in the NCD to the conduction band of the SiC by forward biasing. The forward current shows different behavior from typical SiC Schottky diodes at high temperatures.
Authors:
; ;  [1] ;  [2] ;  [3]
  1. Graduate School of Automotive Science, Kyushu University, Nishiku, Fukuoka 819-0395 (Japan)
  2. Department of Materials Science and Engineering, Kyushu University, Nishiku, Fukuoka 819-0395 (Japan)
  3. Department of Applied Science for Electronics and Materials, Kyushu University, Kasuga, Fukuoka 816-8580 (Japan)
Publication Date:
OSTI Identifier:
22262616
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 104; Journal Issue: 15; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; CRYSTALS; DIAMONDS; ENERGY LEVELS; HETEROJUNCTIONS; LEAKAGE CURRENT; NANOSTRUCTURES; P-N JUNCTIONS; SCHOTTKY BARRIER DIODES; SILICON CARBIDES