Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Ultrafast charge carrier separation in Potassium-intercalated endohedral
  metallofullerene Sc$_3$N@C$_{80}$ thin films   Molecular materials have emerged as highly tunable materials for photovoltaic
and light-harvesting applications. The most severe challenge of this class of
materials is the trapping of charge carriers in bound electron-hole pairs,
which severely limits the free charge carrier generation. Here, we demonstrate
a significant modification of the exciton dynamics of thin films of endohedral
metallofullerene complexes upon alkali metal intercalation. For the exemplary
case of Sc$_3$N@C$_{80}$ thin films, we show that potassium intercalation
results in an additional relaxation channel for the optically excited
charge-transfer excitons that prevents the trapping of excitons in a long-lived
Frenkel exciton-like state. Instead, K intercalation leads to an ultrafast
exciton dissociation coinciding most likely with the generation of free charge
carriers. In this way, we propose alkali metal doping of molecular films as a
novel approach to enhance the light to-charge carrier conversion efficiency in
photovoltaic materials.

10
The categories of this paper are: q-bio
12
The categories of this paper are: nucl-th
6
The categories of this paper are: astro-ph
9
The categories of this paper are: nlin
37
The categories of this paper are: supr-con
34
The categories of this paper are: chem-ph
30
The categories of this paper are: q-alg
23
The categories of this paper are: solv-int
25
The categories of this paper are: patt-sol
29
The categories of this paper are: funct-an
5
The categories of this paper are: gr-qc
7
The categories of this paper are: hep-th
36
The categories of this paper are: cmp-lg
1
The categories of this paper are: cs
19
The categories of this paper are: eess
31
The categories of this paper are: ao-sci