Low light level hybrid tv device based on Electron –sensitive ccd for nir range

The hybrid photodetector (HPD) is a proximity electro-vacuum device with photocathode and solid-state element – electron-sensitive CCD.
In HPD for NIR range a photocathode with drawing electrical field based on InP/InGaAs structure is used, that provides high sensitivity in range of 950 ÷ 1650 nm.
When photoelectrons hit array with energy, higher than 2-3 keV, generation of electron-hole pairs occurs in silicon, and gain of signal increases in several hundred times.
Because of signal gain in electron-sensitive CCD array HPD will have sensitivity of 1-2 order higher than solid-state analogues.


In HPD the whole signal photoelectron flow from photocathode reaches array, there are no intermediate signal converting, so noise factor is about 1,1. Besides, there are no fiber-optics elements in HPD, which decrease device radiation hardness.


The device is recommended to apply in low light level portable TV equipment, observation systems for aircrafts, etc.


Spectral range, nm 950÷1650
Photocathode quantum efficiency in maximum, % 2-10
Photocathode voltage, kV 4-5
Sensitive area size, mm 13,1×9,8
Number of pixels 768×580
Pixel size, μm 17×34
Sensitivity, A/W 4-20
Threshold irradiation, W/pixel (W/cm2) ~2·10-13 (~3,4·10-8)
Device diameter, mm 60
Device height, mm 23


It is possible to manufacture a photodetector based on HPD, including hybrid device,  power supply sources and signal processing electronics.

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