Photoconduction and polarization effects in a heat-treated Au/Pb2CrO5/SnO2 film device |
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Authors: | KA Wishah MM Abdul-Gader |
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Institution: | (1) Department of Physics, University of Jordan, Amman, Jordan, JO |
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Abstract: | 2 CrO5/SnO2 sandwich-structured film device (1.39 μm thick) was measured at room temperature as a function of frequency in the range
5 Hz-5 kHz, both in the dark and under illumination with visible light of different intensities. The Pb2CrO5 film was prepared at a substrate temperature of 200 °C and annealed at a temperature of 460 °C, and has been characterized
to be polycrystalline-rich in sizable micro-grains. The experimental frequency-dependence of the total ac-impedance was found
to be adequately described over the entire frequency range used by a proposed equivalent RC-circuit model that took into consideration
the contributions of the bulk, grain-boundaries, and electrode–Pb2CrO5 interface to the device’s ac behavior. Bulk conduction within crystalline grains due to the semiconductivity of Pb2CrO5 and space-charge effects in the highly resistive grain-boundary regions have been found to dominate the device’s ac-behavior
at frequencies higher than 100 Hz and were strongly dependent on light intensity. The light-intensity behavior of the circuit-parameters
associated with grain-boundary effects can be understood by the use of grain-boundary trapping models. The effect of interfacial
space-charge polarization in the region near the electrode–Pb2CrO5 junction has been noted to be most significant at the low-frequency side and was not highly affected by illumination of the
device.
Received: 13 February 1997/Accepted: 30 July 1997 |
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Keywords: | PACS: 72 20 72 40 72 80J 77 30 77 40 |
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