Regensburg 2013 – wissenschaftliches Programm

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DF: Fachverband Dielektrische Festkörper

DF 10: Optical and nonlinear optical properties, photonic

DF 10.6: Vortrag

Dienstag, 12. März 2013, 11:20–11:40, H11

Hopping transport in crystalline insulators and semiconductors: the effects of site-correlation and trap saturation in 1, 2 and 3 dimensions — •Christoph Merschjann — Helmholtz-Zentrum-Berlin für Materialien und Energie

Hopping transport of particles and quasiparticles (e.g., electrons, small polarons, or excitons) in otherwise perfectly crystalline insulators and semiconductors is often (vaguely) mentioned in possible explanations for experimental findings in optical and electrical spectroscopy.
Typical problems include transient absorption and luminescence measurements in bulk crystals and lower dimensional systems like monolayers or polymer strands.

A random-walk approach is applied to address the effects of site-correlation (e.g. after excitation out of traps) and trap-saturation (e.g. due to recombination of electrons and holes after band-band excitation). It is found that both effects lead to characteristic deviations from Debye-like monoexponential relaxation and give means to deduce the dimensionality of the investigated problem from spectroscopic measurements.