Detection of light with a transparent graphene-based nano-thin photo-detector

Detection of light with a transparent graphene-based nano-thin photo-detector

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物質理工学院 Saulius Juodkazis特任教授、Mangirdas Malinauskas特任准教授の共著論文

“Optically-Thin Broadband Graphene-Membrane Photodetector”

が、Nanomaterials に掲載されました。(DOI: https://doi.org/10.3390/nano10030407

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<Abstract>

A broadband graphene-on-Si3N4-membrane photodetector for the visible-IR spectral range is realised by simple lithography and deposition techniques. Photo-current is produced upon illumination due to presence of the build-in potential between dissimilar metal electrodes on graphene as a result of charge transfer. The sensitivity of the photo-detector is 1.1∼1.1 μμ A/W when irradiated with 515 and 1030 nm wavelengths; a smaller separation between the metal contacts favors gradient formation of the built-in electric field and increases the efficiency of charge separation. This optically-thin graphene-on-membrane photodetector and its interdigitated counterpart has the potential to be used within 3D optical elements, such as photonic crystals, sensors, and wearable electronics applications where there is a need to minimise optical losses introduced by the detector.