Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Multi-layer MoS2/GaN UV-Visible photodetector with observation of MoS2
  band edge in spectral responsivity   We report on the demonstration of MoS2/GaN UV-visible photodetectors with
high spectral responsivity both in UV and in visible regions as well as the
observation of MoS2 band-edge in spectral responsivity. Multi-layer MoS2 flakes
of thickness ~ 200 nm were exfoliated on epitaxial GaN-on-sapphire, followed by
fabrication of detectors in a lateral Metal-Semiconductor-Metal (MSM) geometry
with Ni/Au contacts which were insulated from the GaN layer underneath by Al2O3
dielectric. Devices exhibited distinct steps in spectral responsivity at 365 nm
and at ~ 685 nm with a corresponding photo-to-dark current ratio of ~4000 and ~
100 respectively. Responsivity of 0.1 A/W (at 10 V) was measured at 365 nm
corresponding to GaN band edge, while the second band edge at ~ 685 nm is
characterized by a spectral responsivity (SR) of ~ 33 A/W when accounted for
the flake size, corresponding to the direct band gap at K point of multi-layer
MoS2.

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The categories of this paper are: alg-geom
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The categories of this paper are: hep-ph
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The categories of this paper are: math
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The categories of this paper are: atom-ph
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The categories of this paper are: quant-ph
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The categories of this paper are: bayes-an
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The categories of this paper are: math-ph
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The categories of this paper are: acc-phys
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The categories of this paper are: q-alg
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The categories of this paper are: eess
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The categories of this paper are: adap-org
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The categories of this paper are: funct-an
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The categories of this paper are: nucl-ex
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The categories of this paper are: q-bio
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The categories of this paper are: mtrl-th
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The categories of this paper are: cond-mat