TY  - JOUR
AU  - Henrich, D.
AU  - Dorner, S.
AU  - Hofherr, M.
AU  - Il'in, K.
AU  - Semenov, A.
AU  - Heintze, E.
AU  - Scheffler, M.
AU  - Dressel, M.
AU  - Siegel, M.
A2  - D. Henrich, S. Dorner, M. Hofherr, K. Il'in, A. Semenov, E. Heintze, M. Scheffler, M. Dressel, M. Siegel
PY  - 2012
DA  - 2012//
TI  - Broadening of hot-spot response spectrum of superconducting NbN nanowire single-photon detector with reduced nitrogen content
T2  - J. Appl. Phys.
VL  - 112
KW  - SSPD
KW  - SNSPD
KW  - magnetron sputtering
KW  - spectrum
KW  - NbN film
KW  - nitrogen concentration
AB  - 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]
LA  - English
N1  - exported from refbase (https://db.rplab.ru/refbase/show.php?record=877), last updated on Mon, 15 Oct 2012 18:13:34 -0500
ID  - Henrich_etal2012
ER  -