@Article{Henrich_etal2012,
author="Henrich, D.
and Dorner, S.
and Hofherr, M.
and Il{\textquoteright}in, K.
and Semenov, A.
and Heintze, E.
and Scheffler, M.
and Dressel, M.
and Siegel, M.",
title="Broadening of hot-spot response spectrum of superconducting NbN nanowire single-photon detector with reduced nitrogen content",
journal="J. Appl. Phys.",
year="2012",
volume="112",
optkeywords="SSPD; SNSPD; magnetron sputtering; spectrum; NbN film; nitrogen concentration",
abstract="The spectral detection efficiency and the dark count rate of superconducting nanowiresingle-photon detectors (SNSPD) have been studied systematically on detectors made from thinNbN films with different chemical compositions. Reduction of the nitrogen content in the 4 nmthick NbN films results in a decrease of the dark count rates more than two orders of magnitudeand in a red shift of the cut-off wavelength of the hot-spot SNSPD response. The observedphenomena are explained by an improvement of uniformity of NbN films that has been confirmedby a decrease of resistivity and an increase of the ratio of the measured critical current to thedepairing current. The latter factor is considered as the most crucial for both the cut-offwavelength and the dark count rates of SNSPD. Based on our results we propose a set of criteriafor material properties to optimize SNSPD in the infrared spectral region. VC 2012 AmericanInstitute of Physics. [http://dx.doi.org/10.1063/1.4757625]",
optnote="exported from refbase (https://db.rplab.ru/refbase/show.php?record=877), last updated on Mon, 15 Oct 2012 18:13:34 -0500",
language="English"
}