Abstract
The paper reports on the design and characterization of InGaAs/InP
single photon avalanche diodes (SPADs) for photon counting applications
Lit wavelengths near 1.5 mu m. It is shown how lower internal electric
field amplitudes can lead to reduced dark count rates, but at the
expense of degraded afterpulsing behaviour and larger timing jitter.
Dark count rate behaviour provides evidence of thermally assisted
tunnelling with an average thermal activation energy of similar to
0.14 eV between 150 K and 220 K. Afterpulsing behaviour exhibits
a structure-dependent afterpulsing activation energy, which quantities
how carrier de-trapping varies with temperature. SPAD performance
simultancously exhibits a dark count rate of 10 kHz at a detection
efficiency of 20\% with timing jitter of 100 ps at 200K, and with
appropriate performance tradeoffs, we demonstrate a 200 K dark count
rate as low as 3 kHz, a detection efficiency as high as 45\%, and
a timing jitter as low as 30 ps.
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