Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Glass engineering to enhance Si solar cells: a case study of
  Pr$^{3+}$-Yb$^{3+}$ codoped tellurite-tungstate as spectral converter   Spectral converters are known to increase photovoltaic energy conversion by
minimizing losses due to fundamental non-absorption and thermalization
processes, and have been suggested to surpass the Shockley-Queisser efficiency
limit in single junction solar cells. Here we present a detailed spectroscopic
study of photoluminescence in tellurite-tungstate glasses doped and codoped
with $Pr^{3+}-Yb^{3+}$ and $Ag$ nanoparticles. The energy transfer mechanisms
between $Pr^{3+}$ and $Yb^{3+}$ are discussed based on the near infrared
emission under excitation at $442$ nm and on the upconversion emission under
excitation at $980$ nm. Fluorescence quenching of $^2 F_{5/2}$ level of
$Yb^{3+}$ is observed by increasing the concentration of $Pr^{3+}$, as well as
by the addition of $Ag$ nanoparticles. In addition, a discussion on the
potential of this glass to increase energy production in spectral converters is
presented. The results suggest that the few undesirable energy transfer
processes occurring in this material are difficult to be controlled or
eliminated properly, resulting in intrinsic losses. This discussion is extended
to the potential of glass science to enhance energy production in solar cells,
showing that newer designs such as bifacial cells may facilitate the
exploration of glasses other than soda-lime for mass production of solar cells.
The focus on extending the lifespan by reducing UV induced degradation seems to
be a more effective approach than the development of spectral converters for Si
solar cells.

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The categories of this paper are: dg-ga
32
The categories of this paper are: atom-ph
2
The categories of this paper are: math
29
The categories of this paper are: funct-an
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The categories of this paper are: stat
26
The categories of this paper are: bayes-an
30
The categories of this paper are: q-alg
13
The categories of this paper are: quant-ph
37
The categories of this paper are: supr-con
1
The categories of this paper are: cs
35
The categories of this paper are: mtrl-th
9
The categories of this paper are: nlin
31
The categories of this paper are: ao-sci
33
The categories of this paper are: plasm-ph
0
The categories of this paper are: hep-ph
7
The categories of this paper are: hep-th