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A study of temperature dependent current-voltage (I-V-T) characteristics in Ni/sol-gel β-Ga2O3/n-GaN structure
پدید آورنده
Gao, JKaya, AChopdekar, RVXu, ZTakamura, YIslam, MSChowdhury, S
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32910706
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025
LA29f2r0z3
A study of temperature dependent current-voltage (I-V-T) characteristics in Ni/sol-gel β-Ga2O3/n-GaN structure
[Article]
Gao, JKaya, AChopdekar, RVXu, ZTakamura, YIslam, MSChowdhury, S
© 2018, Springer Science+Business Media, LLC, part of Springer Nature. β-Ga2O3 thin films were grown on n-type GaN substrates using the sol-gel method. The forward-biased temperature dependent current-voltage (I-V-T) characteristics of Ni/β-Ga2O3/GaN structure have been investigated in the temperature range of 298-473 K. The apparent barrier height (ϕap) increased while the ideality factor (n) decreased with the increase in temperature. Such a temperature dependent behavior of ϕap and n was explained by the inhomogeneity of ϕap, which obeyed Gaussian distribution with zero-bias mean barrier height (ϕ¯ B0) of 1.02 ± 0.02 eV and standard deviation (σs0) of 153 ± 0.04 mV. Subsequently, ϕ¯ B0 and Richardson constant A* were obtained from the slope and intercept of the modified Richardson plot as 0.99 ± 0.01 e V and 67.2 A cm−2 K−2, respectively. The ϕ¯ B0 obtained from the modified Richardson plot was in good agreement with the theoretical value calculated from the work function of Ni and electron affinity of β-Ga2O3. The I-V-T characteristics of Ni/β-Ga2O3/GaN MOS structures can be successfully explained by the thermionic emission theory with a single Gaussian distribution of the barrier height.
2018
UC Davis
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275734
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