Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Light-Emitting Electrochemical Cells of Single Crystal Hybrid Halide
  Perovskite with Vertically Aligned Carbon Nanotubes Contacts   Based on the reported ion migration under electric field in hybrid lead
halide perovskites we have developed a bright, light emitting electrochemical
cell with CH3NH3PbBr3 single crystals directly grown on vertically aligned
carbon nanotube (VACNT) forests as contact electrodes. Under the applied
electric field, charged ions in the crystal drift and accumulate in the
vicinity of the electrodes, resulting in an in operando formed p-i-n
heterojunction. The decreased interface energy barrier and the strong charge
injection due to the CNT tip enhanced electric field, result in a bright green
light emission up to 1800 cd/m2 at room temperature (average = 60 cd/m2).
Beyond the light emission, this original device architecture points to the
possibility of implementing vertically aligned CNTs as electrodes in
operationally-stable perovskite-based optoelectronic devices.

1
The categories of this paper are: cs
6
The categories of this paper are: astro-ph
15
The categories of this paper are: nucl-ex
28
The categories of this paper are: alg-geom
30
The categories of this paper are: q-alg
13
The categories of this paper are: quant-ph
9
The categories of this paper are: nlin
10
The categories of this paper are: q-bio
18
The categories of this paper are: econ
17
The categories of this paper are: q-fin
26
The categories of this paper are: bayes-an
0
The categories of this paper are: hep-ph
34
The categories of this paper are: chem-ph
29
The categories of this paper are: funct-an
20
The categories of this paper are: acc-phys
23
The categories of this paper are: solv-int