Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Influence of growth parameters on structural properties and bandgap of
  InN epilayers deposited in a showerhead MOVPE system   From a detailed analysis of InN epilayers deposited in a close-coupled
showerhead metalorganic vapour phase epitaxy (MOVPE) system under various
conditions we investigate the effect of growth parameters on the lattice
constants of the InN layer. The layers are under significant internal
hydrostatic stress which influences the optical properties. Samples typically
fall into two broad categories of stress, with resultant luminescence emission
around 0.8eV and 1.1eV. We can correlate the internal stress in the layer and
the value of the optical absorption edge, and the PL emission wavelength.

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The categories of this paper are: hep-ex
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The categories of this paper are: dg-ga
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The categories of this paper are: nucl-ex
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The categories of this paper are: q-fin
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The categories of this paper are: stat
33
The categories of this paper are: plasm-ph
34
The categories of this paper are: chem-ph
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The categories of this paper are: math-ph
11
The categories of this paper are: hep-lat
36
The categories of this paper are: cmp-lg
13
The categories of this paper are: quant-ph
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The categories of this paper are: astro-ph
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The categories of this paper are: atom-ph
35
The categories of this paper are: mtrl-th
3
The categories of this paper are: physics
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The categories of this paper are: adap-org