Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Interface Optimization via Fullerene Blends Enables Open-Circuit
  Voltages of 1.35 V in CH3NH3Pb(I0.8Br0.2)3 Solar Cells   Non-radiative recombination processes are the biggest hindrance to
approaching the radiative limit of the open-circuit voltage for wide-band gap
perovskite solar cells. In addition, to high bulk quality, good interfaces and
good energy level alignment for majority carriers at charge transport
layer-absorber interfaces are crucial to minimize non-radiative recombination
pathways. By tuning the lowest-unoccupied molecular-orbital of electron
transport layers via the use of different fullerenes and fullerene blends, we
demonstrate open-circuit voltages exceeding 1.35 V in CH3NH3Pb(I0.8Br0.2)3
device. Further optimization of mobility in binary fullerenes electron
transport layer can boost the power conversion efficiency as high as 18.6%. We
note in particular that the Voc-fill factor product is > 1.085 V, which is the
highest value reported for halide perovskites with this band gap.

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The categories of this paper are: nlin
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The categories of this paper are: patt-sol
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The categories of this paper are: quant-ph
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The categories of this paper are: gr-qc
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The categories of this paper are: cs
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The categories of this paper are: supr-con
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The categories of this paper are: atom-ph
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The categories of this paper are: adap-org
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The categories of this paper are: cmp-lg
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The categories of this paper are: math-ph
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The categories of this paper are: solv-int
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The categories of this paper are: funct-an
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The categories of this paper are: mtrl-th
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The categories of this paper are: acc-phys
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The categories of this paper are: dg-ga
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The categories of this paper are: hep-ph