Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Enhanced Structural Stability and Photo Responsiveness of CH3NH3SnI3
  Perovskite via Pressure-Induced Amorphization and Recrystallization   An organic-inorganic halide perovskite of CH3NH3SnI3 with significantly
improved structural stability is obtained via pressure-induced amorphization
and recrystallization. In situ high-pressure resistance measurements reveal an
increased electrical conductivity by 300% in the pressure-treated perovskite.
Photocurrent measurements also reveal a substantial enhancement in
visible-light responsiveness. The mechanism underlying the enhanced properties
is demonstrated to be associated with the improved structural stability.

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The categories of this paper are: atom-ph
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The categories of this paper are: comp-gas
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The categories of this paper are: patt-sol
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The categories of this paper are: adap-org
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The categories of this paper are: hep-lat
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The categories of this paper are: mtrl-th
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The categories of this paper are: stat
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The categories of this paper are: q-alg
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The categories of this paper are: math-ph
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The categories of this paper are: hep-ex
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The categories of this paper are: nlin
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The categories of this paper are: math
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The categories of this paper are: cs
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The categories of this paper are: q-fin
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The categories of this paper are: hep-ph
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The categories of this paper are: chem-ph