Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Synthesis and temperature-dependent photoluminescence of high density
  GeSe triangular nanoplate arrays on Si substrates   We have grown germanium selenide (GeSe) triangular nanoplate arrays (TNAs)
with a high density (3.82E+6 / mm2) on the Si (111) substrate using a simple
thermal evaporation method. The thickness and trilateral lengths of a single
triangular nanoplate were statistically estimated by atomic force microscopy
(AFM) as 44 nm, 365 nm, 458 nm and 605 nm, respectively. Transmission electron
microscopy (TEM) images and X-ray diffraction (XRD) patterns show that the TNAs
were composed of single crystalline GeSe phase. The Se-related defects in the
lattice were also revealed by TEM images and Raman vibration modes. Unlike
previously reported GeSe compounds, the GeSe TNAs exhibited
temperature-dependent photoluminescence (PL). In addition, not previously
reported PL peak (1.25 eV) of the 44 nm thick TNAs at 5 K was in the gaps
between those of GeSe monolayers (1.5 nm) and thin films (400 nm), revealing a
close relationship between the PL peak and the thickness of GeSe. The
high-density structure and temperature-dependent PL of the TNAs on the Si
substrate may be useful for temperature controllable semiconductor nanodevices.

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The categories of this paper are: quant-ph
35
The categories of this paper are: mtrl-th
6
The categories of this paper are: astro-ph
18
The categories of this paper are: econ
24
The categories of this paper are: dg-ga
16
The categories of this paper are: stat
28
The categories of this paper are: alg-geom
12
The categories of this paper are: nucl-th
33
The categories of this paper are: plasm-ph
7
The categories of this paper are: hep-th
30
The categories of this paper are: q-alg
14
The categories of this paper are: math-ph
34
The categories of this paper are: chem-ph
27
The categories of this paper are: comp-gas
2
The categories of this paper are: math
1
The categories of this paper are: cs