Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Tiling large areas with luminescent solar concentrators: geometry
  effects   Luminescence solar concentrators act as semi-transparent photovoltaic cells
and can be applied to large surface areas in modern urban environment. In this
paper their optical efficiencies were analytically derived for different unit
shapes as simple, integral-free expressions. Perimeter length increase for the
same enclosed area requires more photodetectors, yet reduces optical losses per
unit. An exact interplay between these two parameters is presented, which can
be directly applied to the analysis of tiling for large areas. An explicit
expression for the critical size of an LSC unit, above which its inner part
becomes inactive, has been obtained. Fabrication of devices larger than
specified by this limit should be discouraged from efficiency considerations.

5
The categories of this paper are: gr-qc
15
The categories of this paper are: nucl-ex
23
The categories of this paper are: solv-int
33
The categories of this paper are: plasm-ph
10
The categories of this paper are: q-bio
8
The categories of this paper are: hep-ex
32
The categories of this paper are: atom-ph
26
The categories of this paper are: bayes-an
27
The categories of this paper are: comp-gas
35
The categories of this paper are: mtrl-th
9
The categories of this paper are: nlin
17
The categories of this paper are: q-fin
20
The categories of this paper are: acc-phys
30
The categories of this paper are: q-alg
37
The categories of this paper are: supr-con
28
The categories of this paper are: alg-geom