| 1. |
- Indykiewicz, Kornelia, 1986, et al.
(author)
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Current-induced enhancement of photo-response in graphene THz radiation detectors
- 2022
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In: AIP Advances. - : AIP Publishing. - 2158-3226 .- 2158-3226. ; 12:11
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Journal article (peer-reviewed)abstract
- Thermoelectric readout in a graphene terahertz (THz) radiation detector requires a p-n junction across the graphene channel. Even without an intentional p-n junction, two latent junctions can exist in the vicinity of the electrodes/antennas through the proximity to the metal. In a symmetrical structure, these junctions are connected back-to-back and therefore counterbalance each other with regard to rectification of the ac signal. Because of the Peltier effect, a small dc current results in additional heating in one and cooling in another p-n junction, thereby breaking the symmetry. The p-n junctions then no longer cancel, resulting in a greatly enhanced rectified signal. This allows simplifying the design and controlling the sensitivity of THz radiation detectors.
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| 2. |
- Khan, Munis, 1991, et al.
(author)
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High mobility graphene on EVA/PET
- 2022
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In: Nanomaterials. - : MDPI AG. - 2079-4991. ; 12:3
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Journal article (peer-reviewed)abstract
- Transparent conductive film on a plastic substrate is a critical component in low cost, flexible and lightweight optoelectronics. CVD graphene transferred from copper- to ethylene vinyl acetate (EVA)/polyethylene terephthalate (PET) foil by hot press lamination has been reported as a robust and affordable alternative to manufacture highly flexible and conductive films. Here, we demonstrate that annealing the samples at 60 ∘C under a flow of nitrogen, after wet etching of copper foil by nitric acid, significantly enhances the Hall mobility of such graphene films. Raman, Scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS) were used to evaluate the morphology and chemical composition of the graphene.
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