Congratulations to Dr. Huygen Jöbsis for an Excellent PhD Defense. Rafael has successfully defended his PhD thesis, supervised by Prof. Bert Weckhuysen, prof. dr. E. Vogt, and dr. E. Hutter.

In his thesis, Huygen investigated the photoconversion performance of halide-elpasolite semiconductors, which are proposed as more stable and less-toxic alternatives to lead-halide perovskites. His research focused on Cs2AgBiBr6, studying its conversion efficiency through time-resolved spectroscopic techniques to trace charge carrier population density and mobility across various timescales. He explored the mechanochemical formation mechanism and mechanical properties of alloyed AgBi-elpasolites, identifying formation mechanisms of new compositions like Cs2AgBi1−y FeyBr6. Through systematic exchange of the B’-site cation, Huygen developed approaches to increase visible light absorption. His research contributed valuable insights to the synthesis and optimization of elpasolites and their application design.

Huygen’s PhD thesis is available to read here.