Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Space-Charge-Limited Current Fluctuations in Organic Semiconductors   Low-frequency current fluctuations are investigated over a bias range
covering {\em ohmic}, {\em trap-filling} and {\em space-charge-limited current}
regimes in polycrystalline polyacenes. The relative current noise power
spectral density ${\cal S}(f)$ is constant in the {\em ohmic} region, steeply
increases at the {\em trap-filling transition} region and decreases in the {\em
space-charge-limited-current} region.
  The {\em noise peak} at the {\em trap-filling transition} is accounted for
within a {\em continuum percolation model}. As the quasi-Fermi level crosses
the trap level, intricate insulating paths nucleate within the ohmic matrix,
determining the onset of non-equilibrium conditions at the interface between
the insulating and conducting phase. The {\em noise peak} is written in terms
of the free and trapped charge carrier densities.

30
The categories of this paper are: q-alg
23
The categories of this paper are: solv-int
26
The categories of this paper are: bayes-an
10
The categories of this paper are: q-bio
18
The categories of this paper are: econ
9
The categories of this paper are: nlin
7
The categories of this paper are: hep-th
13
The categories of this paper are: quant-ph
11
The categories of this paper are: hep-lat
20
The categories of this paper are: acc-phys
12
The categories of this paper are: nucl-th
34
The categories of this paper are: chem-ph
8
The categories of this paper are: hep-ex
15
The categories of this paper are: nucl-ex
35
The categories of this paper are: mtrl-th
5
The categories of this paper are: gr-qc