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"I am interested in understanding the impact of morphology upon the charge carrier dynamics in organic semiconductors, with particular emphasis on polymer-based solar cells. My research has been focused in the use of transient absorption spectroscopy to study the photophysics of polymer/fullerene blend films. Currently, my research at PwM includes studying generation, extraction and recombination in solar cell devices using optoelectronic techniques including time-delayed collection field, with the aim of having a deeper understanding of how the morphology affects the motion of carriers and with that the overall performance in these multicomponent organic materials."
"My research focuses on the interface between inorganic and organic semiconductors. In particular I am interested in the mechanisms of charge transfer across those hybrid interfaces and the nature of the states involved. Opto-electronic devices comprising planar heterojunctions of metal oxide and organic semiconductors with well-defined interface morphology and energetics serve as model system for my investigations. Simulation assisted analysis of field dependent electroluminescence as well as temperature and intensity dependent photovoltaic characterization help to elucidate and understand the physics of the elementary electronic processes at hybrid inorganic/organic interfaces."
"My general interests lie in new technologies to produce renewable clean energy and to store electrical energy. Currently, I am studying the electronic properties of organic semiconductors, also in combination with organometallic perovskites, to be used as photo-active layers in solar cells, photodetectors, light emitting diodes and transistors. I develop opto-electronic measurement techniques to study in detail the transport and recombination of charges on different timescales, with particular focus on the role of the mobility in the organic material in limiting the overall device performance. I aim to use this knowledge to optimize the performance of photovoltaic cells or design opto-electronic devices with specifically tailored properties."
"My research focuses on the development of efficient organic/inorganic hybrid multi-junction solar cells and the understanding of fundamental working principles of organic solar cells. I especially examine the recombination pathways and the open circuit voltage of organic solar cells to understand the charge carrier loss mechanism. To investigate recombination of charge carriers I use transient and steady state techniques. To investigate open circuit voltage I specialized on the analysis of electroluminescence and photovoltaic quantum efficiency spectra based on the principle of detailed balance."
"I like to understand the mechanisms of charge generation in polymer/ fullerene bulk hetero junction solar cells with the help of time-resolved and steady state measurement techniques. One of my specialties is the Time Delayed Collection Field method, an optical-pump electrical-probe technique which allows us to directly measure the field dependence of charge generation and the charge recombination dynamics in a working device."
"My interest lies in the fundamental understanding of working-principles and loss-mechanisms in perovskite solar cells. I try to understand the interplay between the perovskite absorber material and the adjacent organic transport layers, on time scales ranging from ps to steady-state conditions. In particular I use (transient) optical/electronical measurement techniques to assess the dynamics of charge carriers in films, single crystals and working solar cell, and to use this knowledge to optimize the multilayer architecture."
"Molecular doping is a convenient way of improving the electronic properties of semiconducting polymers, but is a technique that isn't completely understood yet. My interest lies in understanding and elucidating the fundamental processes that occur upon doping polymers with organic small molecules. I utilize a combination of UV-Vis-NIR spectroscopy, atomic force microscopy, conductivity and surface potential measurements to study the optical, morphological and electronic changes that occur with doping, and thereby deduce the doping mechanism, efficiency, kinetics, etc. in doped solutions and/or films."
"My research aims in the realization of monolithic perovskite/silicon tandem solar cells on textured wafer surfaces that are utilized for optimum light management. To pursue my goal I will develop new strategies to process inorganic-organic perovskite films on textured silicon surfaces. Additionally, my research focuses on the fundamental physical understanding of the film formation and of the transport and recombination of charges in this type of tandem structure."
"My interest lies in the hybrid interfaces between organic molecules and inorganic semiconductors. In particular I focus on the formation of the interfacial Hybrid Charge Transfer State and its role in the exciton dissociation in operative devices. Primarily I measure angle, temperature and current dependent electroluminescence to appraise different properties of the hybrid interface in order to improve the efficiency of hybrid solar cells."
"In my research work, I focus on polymeric hole transport layers for perovskite solar cells. As such, I attempt to increase the polymer conductivity by molecular doping. To this end I employ different techniques such as optical spectroscopy and conductivity measurements, to understand the underlying doping mechanisms and the impact of layer morphology (e.g. AFM). The goal is to understand and optimize doping in these polymeric layers, which will render highly efficient perovskite solar cells and may impact other applications."
"My research is on a new approach to selectively address the charge carrier mobility of electrons and holes in multicomponent organic semiconductors. The approach relies on the well-known time-of-flight technique, but with a pevoskite film as the charge generation layer. By exciting only the perovskite, charges are generated and injected into the organic layer at a well-defined position and time, allowing for the precise measurement of the carrier transit time."
"I work on improving the performance of regular structured (n-i-p) perovskite solar cells, by using different hole and electron transporting layers. Furthermore, I perform transient measurements in order to gain knowledge about the processes at the interface between perovskite and the adjacent layers."