Radiation tolerant DC characteristics of InAs/GaAs quantum-dot diodes

Effects of
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Cs gamma irradiation on the DC electrical characteristics of InAs/GaAs quantum dots (QDs) mesa diodes are reported. The devices were irradiated with gamma-rays for different doses ranging from 100 rad to about 1 Mrad (GaAs). The QDs mesa diodes are found to be tolerant to γ radiation. No enhanced leakage current and shift in the turn-on voltage were observed in the InAs/GaAs QD devices after exposure to γ-radiation. When irradiated by γ-rays continuously, there seemed to be a small degradation trend in the forward-bias current after irradiating the mesa diode for about six hours.