The group of ass. prof. Jens Uhlig is focused on studying charge carrier dynamics and structural dynamics with x-ray - and optical methods. The group uses large scale facilities as well as develops novel in-house table top spectroscopy setup. Following the idea "seeing is believing" we use the element selectivity of hard and tender x-radiation to localize electronic and structural changes in complex molecular structures with the time-resolution of ultrafast lasers. We can thus follow light induced excitation and optimize charge transfer pathways.
The current research focus lays on intra and inter-structure charge transfer reaction. We work on the molecular side with metal-organic complexes like described in this recent research article:
We also work on using x-ray spectroscopy to trace and analyze charge carrier dynamics in nano-dimensioned light absorbing particles. Current focus lays on CZTS Kesterite type structures.
Our own development is a pulsed table top x-ray source based on a water target combined with a novel energy dispersive microcalorimetric detection system. With this system we can study sub-picosecond dynamics using hard and tender x-rays in a table top system.
Methods available in the group (inhouse):
X-ray absorption fine structure spectroscopy (XAS)
X-ray emission spectroscopy (XES)
Transient optical absorption spectroscopy (TAS)
Methods that the groups uses and that are available at large scale facilities:
X-ray diffuse scatter (XDS)
X-ray photoelectron spectroscopy (XPS)
The group is developing Data-Analysis technology for the above mentioned techniques.
Find more information on the techniques here
Find more information on development of table top spectroscopy here
Find more information on the personal page from Jens Uhlig
Dr. Jens Uhlig