High-Energy Electron Irradiation of Germanium and Tellurium
Tellurium samples in which current flowed parallel to the c axis were irradiated at 78 deg K with 20-Mev electrons. The conductivity increased linearly with a slope of 1.0 x 10-14 (ohm-cm)-1 per electron/cm2 up to at least 3 x 1014 electrons/cm2. Beyond 3 x 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 x 1013 and 5 x 1013 electrons/cm21/RH increases linearly from 3 x 10-5 to 6.3 x 10-5 coulomb/cm3. After irradiation, the samples showed no measurable conductivity changes during 14 hr at 78 deg K. After a day's anneal at 300 deg K the 78 deg 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.
- Research Organization:
- General Atomics Div., General Dynamics Corp., San Diego, Calif.
- Sponsoring Organization:
- USDOE
- NSA Number:
- NSA-13-020606
- OSTI ID:
- 4203384
- Journal Information:
- Journal of Applied Physics, Vol. 30, Issue 8; Other Information: Orig. Receipt Date: 31-DEC-59; ISSN 0021-8979
- Publisher:
- American Institute of Physics (AIP)
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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