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Sub-Micron Area Heterojunction Backward Diode Millimeter-Wave Detectors With 0.18 {\rm pW/Hz}^{1/2} Noise Equivalent Power

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4 Author(s)
Ze Zhang ; Department of Electrical Engineering, University of Notre Dame, Notre Dame, IN, USA ; Rajesh Rajavel ; Peter Deelman ; Patrick Fay

InAs/AlSb/AlGaSb heterojunction backward diodes are promising detectors for millimeter-wave imaging applications due to their high sensitivity, low noise, and high cutoff frequency. By using a device heterostructure with a thin (11 Å) barrier layer, δ-doped cathode, and optimized AlxGa1-xSb anode composition (x=12%), in conjunction with submicron (0.4×0.4 μm2) active area, fabricated detectors have demonstrated DC curvatures of -47 V-1 and record unmatched sensitivities of 4600 V/W at 94 GHz. Impedance-matched sensitivities of 49,700 V/W at 94 GHz are projected from on-wafer S-parameter and sensitivity measurements. These detectors have measured junction resistances of 814 Ω·μm2 and capacitances of 15 fF/μm2. A record low NEPmin of 0.18 pW/Hz1/2 has been projected under conjugate matching conditions. This study demonstrates the potential of Sb-heterostructure backward diodes as ultra-low-noise millimeter-wave direct detectors.

Published in:

IEEE Microwave and Wireless Components Letters  (Volume:21 ,  Issue: 5 )