TY  - JOUR
AU  - Larrey, V.
AU  - Villegier, J-C
AU  - Salez, M.
AU  - Miletto-Granozio, F.
AU  - Karpov, A.
PY  - 1999
DA  - 1999//
TI  - Processing and characterization of high Jc NbN superconducting tunnel junctions for THz analog circuits and RSFQ
JO  - IEEE Trans. Appl. Supercond.
SP  - 3216
EP  - 3219
VL  - 9
IS  - 2
KW  - RSFQ
KW  - NbN
KW  - SIS
AB  - A generic NbN Superconducting Tunnel Junctions (STJ) technology has been developed using conventional substrates (Si and SOI-SIMOX) for making THz spectrometers including SIS receivers and RSFQ logic gates. NbN/MgO/NbN junctions with area of 1 /spl mu/m/sup 2/, Jc of 10 kA/cm/sup 2/ and low sub-gap leakage current (Vm>25 mV) are currently obtained from room temperature sputtered multilayers followed by a post-annealing at 250/spl deg/C. Using a thin MgO buffer layer deposited underneath the NbN electrodes, ensures lower NbN surface resistance values (Rs=7 /spl mu//spl Omega/) at 10 GHz and 4 K. Epitaxial NbN [100] films on MgO [100] with high gap frequency (1.4 THz) have also been achieved under the same deposition conditions at room temperature. The NbN SIS has shown good I-V photon induced steps when LO pumped at 300 GHz. We have developed an 8 levels Al/NbN multilayer process for making 1.5 THz SIS mixers (including Al antennas) on Si membranes patterned in SOI-SIMOX. Using the planarization techniques developed at the Si-MOS CEA-LETI Facility, we have also demonstrated on the possibility of extending our NbN technology to high level RSFQ circuit integration with 0.5 /spl mu/m/sup 2/ junction area, made on large area substrates (up to 8 inches).
UR  - https://doi.org/10.1109/77.783713
DO  - 10.1109/77.783713
N1  - exported from refbase (https://db.rplab.ru/refbase/show.php?record=1081), last updated on Fri, 03 Jun 2016 09:17:16 -0500
ID  - Larrey_etal1999
ER  -