Insitu incorporation of Al and N andp-n junction diode fabrication in alpha(6H)-SiC thin films |
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Authors: | Y C Wang R F Davis J A Edmond |
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Affiliation: | (1) Department of Materials Science and Engineering, North Carolina State University, 27695-7907 Raleigh, NC;(2) Cree Research, Inc., 27713 Durham, NC |
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Abstract: | Aluminum and nitrogen have been introduced asp- andn-type dopants, respectively, during chemical vapor deposition (CVD) ofα(6H)-SiC films on 6H-SiC substrates. The atomic concentration of each dopant in the films showed a linear dependence on partial
pressure of the dopant source gas. The Al species exhibited ideal behavior based on a dilute solution model. Thus elemental
Al and/or a complex containing only one Al atom were the principal species which contributed to the incorporation of this
constituent. The incorporation of N was greater than expected from the dilute solution theory which implied interaction between
N and Si in the SiC. The relationship between ionized dopant concentration (carrier concentration) and the concentration in
each dopant source gas was also linear and parallel to its atomic concentration. The ratios of the carrier concentration to
the atomic concentration for Al and N were 0.02 and 0.06, respectively.P-n junction diodes were fabricated which exhibited rectification and reverse leakage currents at 100 V of 0.19, 0.75, and 1.3
ΜA at 298, 523, and 623 K, respectively. The turn-on voltage decreased from 2.2 to 2.1 and 1.9 V with each incremental increase
in temperature. |
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Keywords: | Alpha(6H)-SiC in situ doping impurity incorporation p-n junction diode |
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