FlexPL

General information

Investigation area
Spectroscopy
Techniques
Low temperature photoluminescence
Raman spectroscopy
Manufacturer
Various
Fabrication year
Various
Measured quantity
Photoluminescence and Raman signal giving rise to numerous measured quantities (strain, doping concentration, carrier mobility, native and foreign defects, excitons, band-band transitions, etc.)
Main application
Measuring photoluminescence and Raman spectra down to a temperature of 9 K in a closed-cycle He-cryostat.
High-throughtput analysis
Yes

Technical aspects
The setup has two mapping functions allowing to map the photoluminescence and Raman spectra on a large scale (several centimeters) and a small scale (100 x 100 µm², sub-µm steps). Various microscope objective lenses are available for the second mapping option. Furthermore, the entire setup can be adapted to individual needs, giving rise to the name "FlexPL". A multitude of optics (filters, polarizers, waveplates, etc.) can be added to the beam path to ensure best spectroscopic results. High resolution but also overview photoluminescence spectra can be obtained in a spectral range of 360 - 950 nm (CCD and poit-detector detection). Therefore, various excitation sources are available (355 nm, 405 nm, 532 nm, 630 nm). Raman spectra can be acquired with a 532 nm and 630 nm laser. The setup is build in a "microscope configuration", allowing for an imaging of most sample surfaces by light microscopy.
Additional measurement possibilities
Depending on the outcome of the measurements with the FlexPL system, there is always the possibility to transition towards other spectroscopic equipment of the AG Callsen based on a collaboration.

Application scientist
Daniel Vaske
Fachbereich 1
IKFP / AG Callsen W4100
Phone number
dvaskeprotect me ?!uni-bremenprotect me ?!.de
Gordon Callsen
Fachbereich 1
IFKP / AG Callsen W4120
Phone number
gcallsenprotect me ?!uni-bremenprotect me ?!.de
Principal investigator
Gordon Callsen