Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Mixing of NFAs ionization energies: an additional tool to tune the
  quantum efficiency of ternary solar cells   Non-fullerene acceptor (NFA)-based ternary bulk heterojunction (TSC),
represent the most efficient organic solar cells (OSCs) today. Beyond their
broader absorption spectra, they often exhibit quantum efficiencies (QE) larger
than binary blends over the whole absorption range. In this work, we relate
this improvement to the energetics driving charge transfer at the electron
donor:electron acceptor (D/A) interfaces. We investigated blends of a donor
(PBDB-T-2F) with several pairs of lower bandgap NFAs. Similar to binary blends,
we find that the QE increases with the ionization energy offset between donor
and acceptor ({\Delta}IE) due to the improved charge transfer, following a
error function that maximizes and plateaus after a value around 0.5 V. However,
this evolution is not controlled by the individual {\Delta}IE of the 2 D/A
interfaces D:NFA1 and D:NFA2. Instead photocurrent generation scales as if it
was proceeding through a single channel controlled by the difference between
the IE of the donor and the weighted-average IE of both NFAs. In particular, we
demonstate that a binary blend PBDB-T-2F:IEICO, in which {\Delta}IE is too low
for efficient charge generation, can be made to work, even in the IEICO
absorption region, by adding a third component (IT-4F) having a deep IE. As a
result, the mixing of two NFA gives us an alternative tool, in addition to
molecular engineering, to adjust {\Delta}IE in bulk heterojunction solar cell,
and thus their quantum efficiency.

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The categories of this paper are: acc-phys
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The categories of this paper are: adap-org
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The categories of this paper are: hep-lat
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The categories of this paper are: hep-ex
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The categories of this paper are: nucl-th
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The categories of this paper are: math-ph
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The categories of this paper are: hep-ph
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The categories of this paper are: nlin
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The categories of this paper are: quant-ph
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The categories of this paper are: chao-dyn
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The categories of this paper are: math
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The categories of this paper are: cs
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The categories of this paper are: hep-th
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The categories of this paper are: q-fin
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The categories of this paper are: supr-con
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The categories of this paper are: comp-gas