Abstract
We report operation of a passively quenched silicon single-photon avalanche photodiode (SPAD) at extremely low dark count rate of 5 Hz. This was achieved by lowering the temperature of a PerkinElmer C30921S SPAD down to −77 °C. We found that the quantum efficiency at 780 nm remained constant over a wide range of cooling temperatures from −32 °C down to −77 °C. The after-pulsing characteristics, however, depended on the cooling temperature.
© 2009 Optical Society of America
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