The aim is to identify, understand, and control the nature of various physical phenomena and functionalities of condensed matter systems. We approach this problem using a variety of linear and non-linear optical techniques and by developing microscopic models to describe the observed phenomena.
The research group Optical Condensed Matter Physics is part of the Zernike Institute for Advanced Materials, a research institute within the Faculty of Science and Engineering of the University of Groningen.
Benedito Raul, performing some preliminary experiments in the recently built visible/infrared pump-probe setup.
Single-material organic solar cells have recently come to the research spotlight due to their simplicity, morphological robustness and high yield of exciton dissociation, which potentially enables high and stable power conversion efficiencies. Using α-sexithiophene as a model system, we have found that the single-event probability of the exciton dissociation at the boundaries of polycrystalline domains with different molecular orientation is extremely low (~0.5%) while the high efficiency of charge generation is gained via hundred-fold crossings of the domain boundaries due to long exciton diffusion length (~45 nm). In this capacity, the findings have direct implications on our understanding of the charge separation mechanism in neat films of organic semiconductors.
This work was published in Phys.Chem.Chem.Phys 23 20848-53 (2021)
Dr Bjorn Kriete was runner up (2nd price) on the Van Swinderen Award, for the best Cum Laude PhD thesis 2020, awarded by the Royal Physics Society of the Netherlands. He did win the "best dutch summary" award.