Investigation of the quantum efficiency degradation over time for InGaAs photocathodes in hybrid devices for near infrared spectral range

The structure and operating principle of InGaAs photocathode in near-IR hybrid photo device are considered. The mechanisms leading to the degradation of the quantum efficiency of the photocathode are being studied. The rate of the quantum efficiency degradation of the photocathode is measured for three hybrid devices. The methods to reduce the degradation of the photocathode sensitivity are suggested.