Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Investigating the theoretical performance of Cs$_2$TiBr$_6$-based
  perovskite solar cell with La-doped BaSnO$_3$ and CuSbS$_2$ as the charge
  transport layers
22
The categories of this paper are: chao-dyn
28
The categories of this paper are: alg-geom
9
The categories of this paper are: nlin
0
The categories of this paper are: hep-ph
17
The categories of this paper are: q-fin
23
The categories of this paper are: solv-int
18
The categories of this paper are: econ
24
The categories of this paper are: dg-ga
11
The categories of this paper are: hep-lat
1
The categories of this paper are: cs
5
The categories of this paper are: gr-qc
32
The categories of this paper are: atom-ph
25
The categories of this paper are: patt-sol
13
The categories of this paper are: quant-ph
19
The categories of this paper are: eess
30
The categories of this paper are: q-alg