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Materials with a small superconducting energy gap are expected to favor ahigh detection efficiency of low-energy photons in superconducting nanowiresingle-photon detectors. We developed a TaN detector with smaller gap and lowerdensity of states at the Fermi energy than in comparable NbN devices, whileother relevant parameters remain essentially unchanged. The observed reductionof the minimum photon energy required for direct detection is in line withmodel predictions of $\approx1/3$ as compared to NbN.

Tantalum nitride superconducting single-photon detectors with low cut-off energy