Current transport and barrier height evaluation in Ni/InAlN/GaN Schottky diodes

Donoval, D.; Chvála, A.; Šramatý, R.; Kov&;#x00E1;č, J.; Carlin, J.-F.; Grandjean, N.; Pozzovivo, G.; Kuzmík, J.; Pogany, D.; Strasser, G.; Kordoš, P.
May 2010
Applied Physics Letters;5/31/2010, Vol. 96 Issue 22, p223501
Academic Journal
The current-voltage characteristics of the Ni/InAlN/GaN Schottky diodes were measured at various temperatures in the range of 300–700 K. The experimental data were analyzed considering different current-transport mechanisms. From the analysis it follows that the tunneling current, which might be due to a multistep tunneling along dislocations, is the dominant component at all temperatures in the samples investigated. The barrier height of the Ni/InAlN/GaN Schottky diodes, evaluated from the thermionic emission current, shows a slightly negative temperature coefficient and its value at 300 K is ≥1.46 eV. This is significantly higher barrier height than reported before (<1 eV). This discrepancy follows from an incorrect evaluation using the intercept and slope of a measured characteristic without separation of the individual current components.


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