Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A physical model for the reverse leakage current in (In,Ga)N/GaN
  light-emitting diodes based on nanowires   We investigated the origin of the high reverse leakage current in light
emitting diodes (LEDs) based on (In,Ga)N/GaN nanowire (NW) ensembles grown by
molecular beam epitaxy on Si substrates. To this end, capacitance deep level
transient spectroscopy (DLTS) and temperature-dependent current-voltage (I-V)
measurements were performed on a fully processed NW-LED. The DLTS measurements
reveal the presence of two distinct electron traps with high concentrations in
the depletion region of the p-i-n junction. These band gap states are located
at energies of $570\pm20$ and $840\pm30$ meV below the conduction band minimum.
The physical origin of these deep level states is discussed. The
temperature-dependent I-V characteristics, acquired between 83 and 403 K, show
that different conduction mechanisms cause the observed leakage current. On the
basis of all these results, we developed a quantitative physical model for
charge transport in the reverse bias regime. By taking into account the mutual
interaction of variable range hopping and electron emission from Coulombic trap
states, with the latter being described by phonon-assisted tunnelling and the
Poole-Frenkel effect, we can model the experimental I-V curves in the entire
range of temperatures with a consistent set of parameters. Our model should be
applicable to planar GaN-based LEDs as well. Furthermore, possible approaches
to decrease the leakage current in NW-LEDs are proposed.

18
The categories of this paper are: econ
28
The categories of this paper are: alg-geom
12
The categories of this paper are: nucl-th
2
The categories of this paper are: math
16
The categories of this paper are: stat
25
The categories of this paper are: patt-sol
14
The categories of this paper are: math-ph
30
The categories of this paper are: q-alg
3
The categories of this paper are: physics
15
The categories of this paper are: nucl-ex
27
The categories of this paper are: comp-gas
20
The categories of this paper are: acc-phys
1
The categories of this paper are: cs
37
The categories of this paper are: supr-con
22
The categories of this paper are: chao-dyn
23
The categories of this paper are: solv-int