Dr. Urs Aeberhard is a Lecturer at the Department of Information Technology and Electrical Engineering at ETH Zurich and a Senior R&D Scientist at Fluxim AG . He earned his Master and PhD in Theoretical Physics from ETH Zurich in 2004 and 2008 respectively, with thesis work on quantum-kinetic theory of quantum well solar cells conducted at the Condensed Matter Theory Group at Paul Scherrer Institut and ETH Zurich . He previously held a postdoctoral researcher position at the Institute of Photovoltaics , Forschungszentrum Jülich from 2009-2012 and was a visiting research scholar at the National Renewable Energy Lab in 2013 . From 2013-2018 , he worked as a tenured staff scientist at IEK-5 Photovoltaik , Forschungszentrum Jülich , where he founded and led the Multiscale Simulation research group. His research focuses on quantum transport formalisms (particularly NEGF ) for photovoltaic device simulation , including charge carrier generation , recombination in nanostructures , and advanced solar cell concepts such as hot-carrier cells , multi-junction architectures , and photon recycling . He has contributed extensively to multiscale modeling of quantum well , wire , and dot solar cells , and his work spans quantum kinetic theory , optoelectronic device simulation , and computational investigation of defect-mediated recombination and non-equilibrium processes in semiconductor nanostructures . His recent publications emphasize hot-carrier filtering in InAs-InP nanowires , terawatt-scale photovoltaic optics , reverse-bias breakdown in all-perovskite tandem modules , and photon recycling effects in ultra-thin and perovskite-based solar cells. He has presented extensively at international conferences on topics including quantum transport with light-matter interaction , multi-scale simulation of non-idealities in tandem photovoltaics , and computational characterization of passivated contacts in silicon solar cells . Dr. Aeberhard is the developer of PVnegf , a tool for non-equilibrium Green's function simulation of quantum photovoltaic devices , which provides first-principles analysis of electronic structure , photocarrier transport , and optical processes in nanoscale solar cells . The framework enables microscopic simulation of quantum wells , wires , and dots for advanced photovoltaic applications .