"My research interest is mainly focused on understanding the charge transfer mechanisms in TMDC/organic hybrid interfaces using time resolved optical spectroscopic technique. TMDCs differ from traditional inorganic semiconductors in that they exhibit a significant exciton binding energy and a strong absorption in the visible range, reminding of organic semiconductors (OSCs). Thus,TMDCs combined with organic non-fullerene acceptors form new and exciting hybrid systems for fundamental studies with potential applications in opto-electronic devices. "
" Felix is a Feodor Lynen Research Fellow from the Alexander von Humboldt Foundation, focusing on the investigation and understanding of radiation-induced defects in halide perovskites. He received his Ph.D. in physics from the Technical University Berlin, studying the stability and degradation of perovskite solar cells, which he conducted at the Helmholtz-Zentrum Berlin. He followed up as a postdoctoral researcher within the group of Prof. Sam Stranks at the Cavendish Laboratory of the University of Cambridge, where he tested and developed next-generation perovskite tandem photovoltaics for space photovoltaics."
“I am originally from the UK and I am a postdoc in the group working on perovskite silicon tandems. I completed my Bachelor and Masters degrees at Durham University in Chemistry. My masters thesis was on the synthesis of luminescent pH probes for cell imaging. I conducted my PhD investigating stability of perovskite LEDs at the University of Oxford under the supervision of Prof. Henry Snaith. Outside of work I enjoy baking bread, brewing beer and playing basketball. “
"Organic solar cells are experiencing a second golden age thanks to the development of novel non-fullerene acceptors (NFAs). My research interest lies in understanding what makes NFAs so especial when blended with common polymer donors. Thereby, I focus on learning how free charge generation and recombination occur in bulk heterojunctions containing NFAs, and how these processes relate to energetic order in the blends. Particularly, I employ optoelectronic techniques such as time-delayed collection field and bias-assisted charge extraction. Moreover, I am interested in the emission properties of devices and films and I apply a combination of photoluminescence and electroluminescence measurements to relate them to the maximum achievable open-circuit voltage. "
"My research aim is to study the energetics and transfer of charge carriers, across an electronically hybrid interface. Tuning the energetics of the inorganic surface by applying self-assembled monolayers, mixing molecules with diﬀerent electrostatic dipoles, incorporating photo-switchable molecules which results in control over the energetics at the organic/inorganic interface."
"Both the deployment and scale-up of perovskite solar cells imply a thorough understanding of the fundamental physical phenomena underlying light absorption, charge separation, carrier transport and energy generation of photovoltaic devices at a laboratory-scale. To achieve this goal, my research focuses on the development and characterisation of thin-film partial stacks and working devices by means of several techniques, namely, electroluminescence and photoluminescence spectroscopy, transient photovoltage and photocurrent measurements. These allow me to assess their loss-mechanisms and recombination channels, and thereby finding the path to the optimization towards the thermodynamic limits. Of my particular interest are the wide-bandgap single-junction perovskite solar cells with organic transport layers intended for tandem applications."
"I am interested in the various recombination processes that occur in perovskite solar cells and I try to understand the main performance limitations of these devices. Attacking these problems from a material science point of view is my main focus but I am also interested in degradation mechanism, tandem solar cells and upscaling which are key points for a commercial success of perovskite solar cells. "
"My research is focused on all-inorganic perovskites for highly efficient tandem solar cells. To this end, I make use of photoluminescence measurement techniques to determine the efficiency potential of perovskite films and to conduct detailed loss analysis in comparison to organic-inorganic perovskites. My main affiliation is with the Young Investigator Group Perovskite Tandem Solar Cells at Helmholtz-Zentrum Berlin."
My research focusses on trying to get a better physical understanding of different perovskite systems. Currently, I am mainly looking into the effect of mobile ions and doping on device performance. In order to do this, I use a combination of experimental work and simulations.
My main affiliation is with the group of Prof. Snaith at the Oxford University, but I am currently visiting the PotsdamPero group.
Despite the exceptional progress of perovskite solar cells, the mechanism governing interfacial recombination is still in debate. A better and more fundamental approach is required to understand the states and pathways the recombination proceeds. To do that I am employed in the SURPRISE project which is about Understanding and suppressing Interfacial charge recombination for high-performance Perovskite Solar cells. My research aims to understand the role of interfacial energy alignment between the perovskite and transport layers and the physical nature of C60-induced interfacial traps. For this, I will use a range of complementary measurement techniques for example transient and steady-state photoluminescence as well as electro-optical transient measurement.
Since the dawn of non-fullerene acceptors (NFAs), there holds much promise for higher efficiency organic solar cells (OSCs). However, the excitonic nature of organic semiconductors means that OSCs still endure innate energy and photovoltage losses, since free charge carriers are formed and recombine via excitons at donor:acceptor interfaces. My research and interest lie in the intersection of these subjects. By using various transient and steady-state optoelectronic techniques, I aim to understand how the energetics and dynamics of the NFA singlet & interfacial excitons relate to the open-circuit voltage, and how they affect fundamental processes like the generation or recombination of free charge carriers in NFA-based OSCs.
My focus lies on developing an automated setup for transient and JV measurements. Therefore, I am working on a software for communication with measuring instruments to acquire data and perform various calculations to compute characteristics of perovskite solar cells. I started with coding my software for fast hysteresis measurements (JV characterization at different scan speeds) but I am expanding the software by other transient measurements such as CELIV and BACE. Another aspect of my work is to build the needed setup with the most cost-effective equipment possible to make my work available to other labs specified on solar cells.