Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Light-dependent Impedance Spectra and Transient Photoconductivity in a
  Ruddlesden-Popper 2D Lead-halide Perovskite Revealed by Electrical Scanned
  Probe Microscopy and Accompanying Theory   Electric force microscopy was used to record the light-dependent impedance
spectrum and the probe transient photoconductivity of a film of butylammonium
lead iodide, BA$_{2}$PbI$_{4}$, a 2D Ruddlesden--Popper perovskite
semiconductor. The impedance spectrum of BA$_{2}$PbI$_{4}$ showed modest
changes as the illumination intensity was varied up to 1400 mW/cm$^{2}$, in
contrast with the comparatively dramatic changes seen for 3D lead-halide
perovskites under similar conditions. BA$_{2}$PbI$_{4}$'s light-induced
conductivity had a rise time and decay time of $\sim$ 100 $\mu$s, 10$^{4}$
slower than expected from direct electron-hole recombination and yet 10$^{5}$
faster than the conductivity-recovery times recently observed in 3D lead-halide
perovskites and attributed to the relaxation of photogenerated vacancies. What
sample properties are probed by electric force microscope measurements remains
an open question. A Lagrangian-mechanics treatment of the electric force
microscope experiment was recently introduced by Dwyer, Harrell, and Marohn
which enabled the calculation of steady-state electric force microscope signals
in terms of a complex sample impedance. Here this impedance treatment of the
tip-sample interaction is extended, through the introduction of a
time-dependent transfer function, to include time-resolved electrical scanned
probe measurements. It is shown that the signal in a phase-kick electric force
microscope experiment, and therefore also the signal in a time-resolved
electrostatic force microscope experiment, can be written explicitly in terms
of the sample's time-dependent resistance (i.e., conductivity).

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The categories of this paper are: ao-sci
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The categories of this paper are: nucl-ex
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The categories of this paper are: cmp-lg
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The categories of this paper are: bayes-an
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The categories of this paper are: atom-ph
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The categories of this paper are: q-bio
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The categories of this paper are: econ
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The categories of this paper are: chao-dyn
0
The categories of this paper are: hep-ph
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The categories of this paper are: eess
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The categories of this paper are: stat
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The categories of this paper are: alg-geom
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The categories of this paper are: astro-ph
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The categories of this paper are: patt-sol
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The categories of this paper are: physics
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The categories of this paper are: nlin