Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Elucidating the long-range charge carrier mobility in metal halide
  perovskite thin films   Many optoelectronic properties have been reported for lead halide perovskite
polycrystalline films. However, ambiguities in the evaluation of these
properties remain, especially for long-range lateral charge transport, where
ionic conduction can complicate interpretation of data. Here we demonstrate a
new technique to measure the long-range charge carrier mobility in such
materials. We combine quasi-steady-state photo-conductivity measurements
(electrical probe) with photo-induced transmission and reflection measurements
(optical probe) to simultaneously evaluate the conductivity and charge carrier
density. With this knowledge we determine the lateral mobility to be ~ 2 cm2/Vs
for CH3NH3PbI3 (MAPbI3) polycrystalline perovskite films prepared from the
acetonitrile/methylamine solvent system. Furthermore, we present significant
differences in long-range charge carrier mobilities, from 2.2 to 0.2 cm2/Vs,
between films of contemporary perovskite compositions prepared via different
fabrication processes, including solution and vapour phase deposition
techniques. Arguably, our work provides the first accurate evaluation of the
long-range lateral charge carrier mobility in lead halide perovskite films,
with charge carrier density in the range typically achieved under photovoltaic
operation.

1
The categories of this paper are: cs
31
The categories of this paper are: ao-sci
28
The categories of this paper are: alg-geom
32
The categories of this paper are: atom-ph
24
The categories of this paper are: dg-ga
15
The categories of this paper are: nucl-ex
9
The categories of this paper are: nlin
13
The categories of this paper are: quant-ph
30
The categories of this paper are: q-alg
26
The categories of this paper are: bayes-an
29
The categories of this paper are: funct-an
19
The categories of this paper are: eess
35
The categories of this paper are: mtrl-th
21
The categories of this paper are: adap-org
2
The categories of this paper are: math
0
The categories of this paper are: hep-ph