Effect of Impedance Relaxation in Conductance Mechanisms in TiO2/ITO/ZnO:Al/p-Si Heterostructure
| Autor: | L. El Mir, M. Nouiri |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
010302 applied physics
Materials science Condensed matter physics Relaxation (NMR) Conductance Heterojunction 02 engineering and technology Activation energy Dielectric Atmospheric temperature range 021001 nanoscience & nanotechnology Condensed Matter Physics Thermal conduction 01 natural sciences Electronic Optical and Magnetic Materials Dielectric spectroscopy 0103 physical sciences Materials Chemistry Electrical and Electronic Engineering 0210 nano-technology |
| Zdroj: | Journal of Electronic Materials. 47:3018-3025 |
| ISSN: | 1543-186X 0361-5235 |
| Popis: | The electrical conduction of a TiO2/ITO/ZnO:Al/p-Si structure under alternating-current excitation was investigated in the temperature range of 80 K to 300 K. The frequency dependence of the capacitance and conductance revealed the response of a thermally activated trap characterized by activation energy of about 140 meV. The frequency dependence of the conductance obeyed the universal dynamic response according to the common relation $$ G = A\omega^{s} $$ . The temperature dependence of the frequency exponent s illustrates that, in the low frequency range, conduction is governed by the correlated barrier hopping (CBH) mechanism involving two distinct energy levels for all investigated temperatures. For the high frequency region, conduction takes place according to the overlapping large-polaron tunneling mechanism at low temperatures but the CBH mechanism becomes dominant in the high temperature region. This difference in electrical behavior between low and high temperatures can be attributed to the dominance of dielectric relaxation at low compared with high temperatures. |
| Databáze: | OpenAIRE |
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