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Title: Bimodal wireless sensing with dual-channel wide bandgap heterostructure varactors

A capacitive wireless sensing scheme is developed that utilizes an AlN/GaN-based dual-channel varactor. The dual-channel heterostructure affords two capacitance plateaus within the capacitance-voltage (CV) characteristic, owing to the two parallel two-dimensional electron gases (2DEGs) located at respective AlN/GaN interfaces. The capacitance plateaus are leveraged for the definition of two resonant states of the sensor when implemented in an inductively-coupled resonant LRC network for wireless readout. The physics-based CV model is compared with published experimental results, which serve as a basis for the sensor embodiment. The bimodal resonant sensor is befitting for a broad application space ranging from gas, electrostatic, and piezoelectric sensors to biological and chemical detection.
Authors:
; ;  [1]
  1. Agnitron Technology Incorporated, Eden Prairie, Minnesota 55346 (United States)
Publication Date:
OSTI Identifier:
22283084
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 104; Journal Issue: 9; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ALUMINIUM NITRIDES; CAPACITANCE; COMPARATIVE EVALUATIONS; ELECTRIC POTENTIAL; ELECTRONIC STRUCTURE; ENERGY GAP; GALLIUM NITRIDES; HETEROJUNCTIONS; INTERFACES; PIEZOELECTRICITY; SENSORS; VARIABLE CAPACITANCE DIODES