Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The vapor controller effect on physical properties of CdTe thin films   This paper reports the optical and structural properties of 400 nm
nanocrystalline cadmium telluride thin films fabricated using a new vapor
controller system in vacuum. This system is indeed a rotating cylinder placed
in the material steam path during coating process. The upper cross section of
the cylinder has one arc groove allowing the steam to pass through. Three type
samples were made under different vapor controlling conditions namely; without
controller system (conventional method), with rotating cylinder, and with upper
cross section of the cylinder alone which acts as a rotating shutter. The
prepared samples have been studied by X-ray diffraction (XRD), Field Emission
Scanning Electron Microscopy (FESEM) and UV-Vis Spectroscopy techniques. The
results show, not only the structural properties were improved by this
technique but also the band gap of samples were changed.

20
The categories of this paper are: acc-phys
33
The categories of this paper are: plasm-ph
1
The categories of this paper are: cs
10
The categories of this paper are: q-bio
24
The categories of this paper are: dg-ga
8
The categories of this paper are: hep-ex
6
The categories of this paper are: astro-ph
9
The categories of this paper are: nlin
37
The categories of this paper are: supr-con
26
The categories of this paper are: bayes-an
16
The categories of this paper are: stat
29
The categories of this paper are: funct-an
0
The categories of this paper are: hep-ph
13
The categories of this paper are: quant-ph
25
The categories of this paper are: patt-sol
19
The categories of this paper are: eess