Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Optical degradation impact on the spectral performance of photovoltaic
  technology   The exponential growth of global capacity along with a reduction in
manufacturing costs in the last two decades has caused photovoltaic (PV) energy
technology to reach a high maturity level. As a consequence, currently,
researchers from all over the world are making great efforts to analyse how
different types of degradation impact this technology. This study provides a
detailed review of the impact of different optical degradation mechanisms,
which mainly affect the transmittance of the top-sheet encapsulant, on the
spectral response of the PV modules. The impact on the spectral performance of
PV modules is evaluated by considering the variations of the short-circuit
current since this is the most widely used parameter to study the spectral
impact in outdoors. Some of the most common types of optical degradation
affecting the performance of PV modules worldwide, such as discoloration,
delamination, aging and soiling have been addressed. Due to the widely
documented impact of soiling on the spectral response of modules, this
mechanism has been specially highlighted in this study. On the other hand, most
of the publications analysed in this review report optical degradation in PV
modules with polymeric encapsulant materials. Furthermore, an innovative
procedure to quantify the spectral impact of degradation on PV devices is
presented. This has been used to analyse the impact of two particular cases of
degradation due to soiling and discoloration on the spectral response of
different PV technologies.

37
The categories of this paper are: supr-con
8
The categories of this paper are: hep-ex
34
The categories of this paper are: chem-ph
19
The categories of this paper are: eess
23
The categories of this paper are: solv-int
7
The categories of this paper are: hep-th
24
The categories of this paper are: dg-ga
17
The categories of this paper are: q-fin
33
The categories of this paper are: plasm-ph
15
The categories of this paper are: nucl-ex
5
The categories of this paper are: gr-qc
10
The categories of this paper are: q-bio
21
The categories of this paper are: adap-org
6
The categories of this paper are: astro-ph
20
The categories of this paper are: acc-phys
14
The categories of this paper are: math-ph