Determination of the impurity concentration in heavily doped inhomogeneous semiconductors from the measurement of the low-temperature conductivity |
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Authors: | I Shlimak R Ussyshkin L Resnick V Ginodman |
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Institution: | (1) The Jack and Pearl Resnick Institute of Advanced Technology, Department of Physics, Bar-Ilan University, 52900 Ramat-Gan, Israel |
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Abstract: | A method has been developed for determining the effective concentration of shallow impuritiesN
* reponsible for the low-temperature conductivity in the vicinity of the metal-insulator transition for inhomogeneous samples of n-Ge:As. The method is based on the measurement of two ratios of sample resistance -R(4.2 K)/R(300 K), =R(2.0 K)/R(4.2 K) and the conductivity (4.2 K). The next step consists of plotting and (4.2) vs . Assuming that is the most reliable parameter, one can calculate, after an averaging procedare, the corrected values of
*,
*(4.2) and the resistivity at room temperature
*(300)=
*
*(4.2)]–1. Finally, using the known dependence (300)=f(N) for homogeneous samples, one can obtain the values ofN
*. The dependences ofN
* on and on are plotted. The scaling behavior of the conductivity of the Ge:As samples with corrected values of
*(4.2) andN
* has been observed down toT=100 mK. |
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Keywords: | 72 20 81 40 |
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