Effect of germane in gas phase on electronic properties of GeXSiY:H alloys deposited by RF plasma discharge
2016 13th International Conference on Electrical Engineering, Computing Science and Automatic Control (CCE)(2016)
摘要
We have studied the effect of Ge-concentration in gas phase on electronic properties of GeXSiY:H alloys deposited by RF-PECVD. The relative gas phase Ge concentration was varied from [Ge]
gas
= 50 % to 100 %. The electronic properties of the films were studied by the measurements of temperature dependence of dark conductivity σ
dark
(T) in the range of T= 300 to 430 K. The temperature dependence curves were described by the thermal activated conduction model and activation energy and Fermi level parameters were calculated. A change in dark conductivity was found from 1.7×10
−6
Ω
−1
cm
−1
at [Ge]
gas
= 50 % to 1.1×10
−4
Ω
−1
cm
−1
at [Ge]
gas
=100 %. The correlation between Ge in gas phase and conductivity was reflected in activation energy and Fermi level values that varied from E
a
= 0.37 to 0.23 eV and E
F
=0.27 to 0.10 eV, respectively.
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关键词
silicon,germanium,activation energy,Fermi level,electronic properties,dark conductivity
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