Physics – Condensed Matter – Statistical Mechanics
Scientific paper
2011-12-09
Physics
Condensed Matter
Statistical Mechanics
5 pages, 8 figures, submitted to Phys. Rev. Lett
Scientific paper
By invoking the microscopic response method in conjunction with a reasonable set of approximations, we obtain new explicit expressions for the electrical conductivity and temperature coefficient of resistivity (TCR) in amorphous semiconductors, especially a-Si:H and a-Ge:H. The predicted TCR for n-doped a-Si:H and a-Ge:H is in agreement with experiments. The conductivity from the transitions from a localized state to an extended state (LE) is comparable to that from the transitions between two localized states (LL). This resolves a long-standing anomaly, a "kink" in the experimental $\log_{10}\sigma $ vs. T$^{-1}$ curve.
Drabold David A.
Zhang Ming-Liang
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