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.

Application:

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

SPECIFICATIONS

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

RELATIVE SPECTRAL RESPONSE CHARACTERISTICS

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

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