High-Energy Electron Irradiation of Germanium and Tellurium

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Abstract
Tellurium samples in which current flowed parallel to the c axis were irradiated at 78°K with 20-Mev electrons. The conductivity increased linearly with a slope of 1.0×10−14 (ohm-cm)−1 per electron/cm2 up to at least 3×1014 electrons/cm2. Beyond 3×1015 electrons/cm2 the slope was approximately one tenth of the initial value. The reciprocal of the Hall coefficient decreased at first and then increased. Between 1×1013 and 5×1013 electrons/cm2 1/RH increases linearly from 3×10−5 to 6.3×10−5 coulomb/cm3. After irradiation, the samples showed no measurable conductivity changes during 14 hr at 78°K. After a day's anneal at 300°K the 78°K conductivity returned to its preirradiation value. N-type germanium was irradiated with 20-Mev electrons at room temperature. Conductivity measurements indicated that the sample became intrinsic and then p type. However, the detailed dependence of conductivity on radiation dosage did not agree with a calculation based on four energy levels introduced into the gap. Carrier lifetime changes were also observed.

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