Metastable effects in the DC conductivity of hydrogenated amorphous germanium
- 18 February 1991
- journal article
- Published by IOP Publishing in Journal of Physics: Condensed Matter
- Vol. 3 (7), 883-888
- https://doi.org/10.1088/0953-8984/3/7/013
Abstract
The authors report on the effect of thermal equilibration on the dark conductivity of undoped optimized a-Ge:H with an optical gap of 1.03 eV. The freeze-in temperature TE is about 160 degrees C. The isothermal relaxation of the conductivity follows a stretched exponential function. The inverse equilibration time tau -1 is thermally activated with an energy Etau of 1.4-1.5 eV. It is then shown that, as compared with the values for a-Si:H TE, tau and Etau are only slightly different. The results are fully consistent with the model of dispersive diffusion of hydrogen.Keywords
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