Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Optical Properties of ITO/ZnO Schottky Diode with Enhanced UV
  Photoresponse   Photoluminescence (PL) spectra of zinc oxide (ZnO) samples with different
hydrogen peroxide (H2O2) treatment durations were measured to examine several
point defects on the surface of the films. These results suggest successful
oxidation through the reaction between oxygen radicals dissociated from H2O2
and the ZnO surface. To further confirm the defect induced gain mechanism, we
fabricate highly transparent Schottky diodes, and measure the key diode
characteristics. Photocurrents are measured under different wavelengths, and
possible explanations of the high optical gain within the ultraviolet (UV)
region are provided.

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The categories of this paper are: quant-ph
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The categories of this paper are: stat
2
The categories of this paper are: math
21
The categories of this paper are: adap-org
12
The categories of this paper are: nucl-th
6
The categories of this paper are: astro-ph
27
The categories of this paper are: comp-gas
3
The categories of this paper are: physics
0
The categories of this paper are: hep-ph
35
The categories of this paper are: mtrl-th
28
The categories of this paper are: alg-geom
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The categories of this paper are: math-ph
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The categories of this paper are: q-bio
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The categories of this paper are: funct-an
5
The categories of this paper are: gr-qc
37
The categories of this paper are: supr-con