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For studying the semiconductor zone structure, the simulation of the conductivity processes and development of real semiconductor devices the knowledge of the effective mass of quasi-particles is necessary. Therefore, the problem of determining the effective mass of the carriers in a specific sample remains to be urgent. On an example of silicon the possibility of determining the effective mass of conductivity and density of states, using the measured spectrum of microwave reflection, has been shown as the set of the information parameters. To implement this, the solution of the corresponding inverse problem has been carried out, consisting in finding the conditions of minimum of the difference of the squares of the values, corresponding to known theoretical and measured experimental spectral dependencies. The calculation and the experiment have been carried out for a range of temperatures, in which the greatest accuracy of the measurements (130-190) had been ensured. For silicon p -type (Ga doped) and n -type (Sb doped) obtained values for the desired effective mass are in good agreement with the values given in literature.

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