Physics – Condensed Matter – Statistical Mechanics
Scientific paper
2011-12-20
Physics
Condensed Matter
Statistical Mechanics
14pages 7 figures, submitted to Phys. Rev. B
Scientific paper
In this paper, we develop an approximate theory of the temperature coefficient of resistivity (TCR) and conductivity based upon the recently proposed Microscopic Response Method. By introducing suitable approximations for the lattice dynamics, localized and extended electronic states, we produce new explicit forms for the conductivity and TCR, which depend on easily accessible material parameters. The theory is in reasonable agreement with experiments on a-Si:H and a-Ge:H. A long-standing puzzle, a \textquotedblleft kink\textquotedblright\ in the experimental $% \log_{10}\sigma $ vs. 1/T curve, is predicted by the theory and attributed to localized to extended transitions, which have not been properly handled in earlier theories.
Drabold David A.
Zhang Ming-Liang
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