The HAD sensor is an abbreviation of the Hole-Accumulation Diode sensor newly developed by Sony. It is a photo sensor consisting of a hole accumulation structure added to an n+P diode.
- High sensitivity
Elimination of the thin polycrystal film Si electrode used in the upper part of the conventional sensor has resulted in higher sensitivity particularly in the short-wavelength range.
- Lower fixed pattern noise caused by dark current
Arrangement of a hole accumulation layer on the sensor surface has reduced dark current generated from the surface.
- No lag
The sensor n+ layer sandwiched between the P well and hole accumulation layer is completely depleted each time the signal charge is read out? Therefore, no lag occurs in the next field.