Abstract
Commercially available, chemical vapor deposition grown, graphene has been used to realize voltage-gate tunable, microwave power detectors. Corbino disc structures with chrome/gold contacts have been fabricated on top of graphene deposited on P-type silicon substrates with silicon dioxide gate oxides. Devices of varying sizes were used to detect a 433.92 MHz signal. These test structures exhibited a peak power detection sensitivity of 3.25 mV/mW at 292 K and 5.43 mV/mW at 80 K. The improved graphene detectors exceed the sensitivity of previously reported graphene detectors, 0.86 mV/mW, as well as previously explored carbon nanotube bolometers, 0.36 mV/mW.
Highlights
Graphene, a single atom layer of carbon in a hexogonal lattice, is of great interest in radio frequency and microwave applications due to its high carrier mobility and DC transfer characteristic [1]
The chemical vapor deposition (CVD) technique for synthesizing graphene is relatively inexpensive, allows for large-scale production, and enables graphene to be transferred to a variety of microwave-compatible substrates
We expand upon the previously reported power detection capabilities of graphene-loaded Corbino disc test structures [2] and present an improved microwave power detector based on aluminum-oxide passivated monolayer graphene
Summary
A single atom layer of carbon in a hexogonal lattice, is of great interest in radio frequency and microwave applications due to its high carrier mobility and DC transfer characteristic [1]. We expand upon the previously reported power detection capabilities of graphene-loaded Corbino disc test structures [2] and present an improved microwave power detector based on aluminum-oxide passivated monolayer graphene. Incident microwave power locally heats the inner disc of the Corbino disc test structure while the outer annulus is held in thermal contact with probe station chassis. We present the results from gated microwave power detection experiments at both room temperature (292 K) and liquid nitrogen cooled temperature (80 K) where the operating frequency was held at 433.92 MHz, the center of one of the unlicensed industrial, scientific, and medical (ISM) radio bands
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