Abstract
Negative photoconductance of heterostructures of silicon dioxide films containing cobalt nanoparticles grown on gallium arsenide SiO2(Co)/GaAs has been observed in the avalanche regime. Light with the photon energy less than the bandgap energy of the GaAs creates holes trapped on defects within the GaAs bandgap. This suppresses the avalanche feedback and causes a reduction of the current flowing through the SiO2(Co)/GaAs heterostructure.
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