AC conductivity in amorphous germanium |
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Authors: | S.C. Agarwal S. Guha K.L. Narasimhan |
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Affiliation: | Solid State Electronics Group, Tata Institute of Fundamental Research, Homi Bhabha Road, Bombay 400005, India |
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Abstract: | The ac conductivity in evaporated amorphous germanium films has been measured as a function of annealing and has been found to obey the ω0.8 law, in accordance with the hopping model. The dc conductivity measurements on the same samples show a law behaviour. The densities of localized states near the Fermi level g(EF), obtained from both experiments are in reasonable agreement with each other. Both the measurements show a reduction by about a factor of 2 in g(EF) when a freshly prepared film is fully annealed. High-temperature substrate films also show the ω0.8 behaviour. This suggests that the frequency dependence of the ac conductivity is not caused by voids alone. Other possible explanations of our results are also discussed. |
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