113 citations · 588 across the 30 of their papers we have counts for
6 papers · 1 filter
Carrier diffusion in GaN -- a cathodoluminescence study. III: Nature of nonradiative recombination at threading dislocations
Jonas Lähnemann, Vladimir M. Kaganer, Karl K. Sabelfeld +5
We investigate the impact of threading dislocations with an edge component (a or a+c-type) on carrier recombination and diffusion in GaN(0001) layers close to the surface as well a…
Carrier diffusion in GaN -- a cathodoluminescence study. II: Ambipolar vs. exciton diffusion
Oliver Brandt, Vladimir M. Kaganer, Jonas Lähnemann +8
We determine the diffusion length of excess carriers in GaN by spatially resolved cathodoluminescence spectroscopy utilizing a single quantum well as carrier collector or carrier s…
Resolution of a bent-crystal spectrometer for X-ray free electron laser pulses: diamond vs. silicon
Vladimir Kaganer, Ilia Petrov, Liubov Samoylova
The resolution function of a spectrometer based on a strongly bent single crystal (bending radius of 10 cm or less) is evaluated. It is shown that the resolution is controlled by t…
Small-angle X-ray scattering from GaN nanowires on Si(111): facet truncation rods, facet roughness, and Porod's law
Vladimir M. Kaganer, Oleg V. Konovalov, Sergio Fernández-Garrido
Small-angle X-ray scattering from GaN nanowires grown on Si(111) is studied experimentally and modeled by means of Monte Carlo simulations. It is shown that the scattering intensit…
Radius-Dependent Homogeneous Strain in Uncoalesced GaN Nanowires
G. Calabrese, D. van Treeck, V. M. Kaganer +6
We investigate the strain state of ensembles of thin and nearly coalescence-free self-assembled GaN nanowires prepared by plasma-assisted molecular beam epitaxy on Ti/AlO$_{3…
Carrier diffusion in GaN -- a cathodoluminescence study. I: Temperature-dependent generation volume
Uwe Jahn, Vladimir M. Kaganer, Karl K. Sabelfeld +8
The determination of the carrier diffusion length of semiconductors such as GaN and GaAs by cathodoluminescence imaging requires accurate knowledge about the spatial distribution o…