High Electric Field Transport in the Lead Chalcogenides.
MASSACHUSETTS INST OF TECH CAMBRIDGE CENTER FOR SPACE RESEARCH
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Nanosecond pulse techniques were used to measure the velocity-field characteristics of bulk samples of n-type PbSe, PbTe and Pb.83Sn.17Te at 77K and 4.2K for carrier concentrations ranging from 1 x 10 to the 17th powercc to 5 x 10 to the 17th powercc. At fields of a few hundred voltscm, strong deviations from ohmic conduction are observed, the velocity showing a clear tendency towards saturation. The theoretical analysis of the results shows that at high electric fields polar optical scattering is dominant in the Pb salts. The results obtained for electric fields above thethreshold for impact ionization are consistent with carrier generation if the Pinch effect is taken into account. Author
- Solid State Physics