Welcome to the website of the theoretical nanostructure photovoltaics group @ IEK-5: Photovoltaik, Forschungszentrum Jülich GmbH. Our research is concerned with the development of theoretical descriptions and simulations of novel nanostructure based solar cell devices. For the micro- and mesoscopic picture, our approach relies on quantum-kinetic theories such as NEGF to cover the relevant physical processes of the photovoltaic device operation under full consideration of quantum effects present at the nanoscale. In this way, photogeneration, photocarrier transport and recombination can be treated on equal footing for arbitrary combinations of low-dimensional absorber and conductor components. Applications include, e.g., III-V quantum well solar cells, silicon based quantum well and quantum dot superlattice solar cells, novel tunnel junction architectures for multijunction solar cells and quantum dot fluorescence for spectral concentration devices. More about our research can be found here.


  • 12.12.16 Dr. Feng Li started as a new postdoc in the group. Dr. Li is an expert in the computational investigation of novel 2D materials using first principles methods. His research at IEK-5 will be focused on the study of electronic stracture and charge carrier transport at passivation layers in silicon heterujunction solar cells.
  • 8.11.16 upcoming presentations: talks of Philippe and Urs at the Euro-TMCSII workshop in cork on 9.12 2016; invited talk of Urs on "Photovoltaic reciprocity and quasi-Fermi level splitting in nanostructure-based solar cells" on 1.2.2017 at the SPIE Photonics West OPTO conference in San Francisco
  • 19.10.15 Our paper on quantum dot array solar cells is now published online in Physical Review Applied
  • 12.8.15 Next Friday, Urs is going to give an invited talk on "Nonequilibrium Green's function theory of nanostructure solar cells" at the workshop "Progress in Nonequilibrium Green's functions" in Lund, Sweden.
  • 11.5.15 The joint EU infrastructure proposal "Energy Oriented Center of Excellence" (EoCoE) coordinated by CEA was successful. Within this project, our group will pursue multiscale optical and electronic simulation of silicon heterojunction solar cells and coordinate the application specific definition of figures of merit on computational design forenergy materials.
  • 22.1.15 upcoming presentations: Urs is going to talk on the topic of "Quantum-kinetic theory of non-radiative processes in nanostructure based solar cell devices" on 30.1. at EuroTMCS1 in Granada, Spain;  On 11.2., Aude Berbezier will present an oral contribution to the SPIE Photonics West OPTO conference in San Francisco with the title "Impacts of contacts and interdot coupling on the photovoltaic performance of quantum dot arrays".
  • 14.11.14 COST action MP1406 ”Multiscale in modelling and validation for solar photovoltaics” is now officially approved! We look forward to four years of intense and fruitful collaborative research.
  • 29.8.14 Urs will give an oral presentation on "Charge carrier dynamics in QD-IBSC from non-equilibrium quantum statistical mechanics" at the 6th World Conference of Photovoltaic Energy Conversion (WCPEC6) in Kyoto, Japan.
  • 21.8.14 Our paper "Simulation of nanostructure-based and ultra-thin film solar cell devices beyond the classical picture" was published online in Journal of Photonics for Energy at http://dx.doi.org/10.1117/1.JPE.4.042099.
  • 18.6.14 Urs will present an invited talk on "Radiative subband transitions in quantum photovoltaic device architectures" at the 2014 HEMP Workshop to be held on 21./22.7.2014 at Imperial College London.
  • 5.5.14 Philippe Czaja started as a new doctoral student with focus on the multiscale simulation of nanostructure based solar cell devices.
  • 28.3.14 Urs will present an invited lecture on "Non-equilibrium Green's functions for optoelectronics" at the EU FP-7 NEWLED project workshop, to be held on 8./9.4.2014 at the University of Rome "Tor Vergata".
  • 17.3.14 Aude Berbezier started her postdoctoral work on phenomenological NEGF models of quantum photovoltaic devices.
  • 4.3.14 Our paper on the NEGF theory of coherent vs. incoherent light-matter coupling in thin films is now published online in PRB at doi/10.1103/PhysRevB.89.115303
  • 10.10.13 There is going to be an invited presentation delivered by Urs at the 2014 SPIE Photonics West Meeting in San Francisco, USA, on Monday 2/3 at 8.30 AM, under the title" Simulation of absorption, photogeneration and carrier extraction in nanostructure-based and ultra thin-film solar cell devices beyond the classical picture"
  • 7.5.13 upcoming talks at conferences:
    • 39th IEEE PVSC, Tampa, Florida, talk on Monday 6/17 in Joint Session Areas 1,3&7, "Rigorous simulation of InAlGaAs-InGaAs bulk and quantum well interband tunnel junctions for multi-junction solar cells"
    • NUSOD13, Vancouver, Canada, talk on Monday 8/19 in the afternoon solar cell session, "Photon Green's functions for a consistent theory of absorption and emission in nanostructure-based solar cell devices"
  • 7.2.13 We have an opening for a Masters thesis project on the simulation of tunnel junctions in thin film silicon multijunction solar cells. For more information, download the pdf file of the announcement, or contact Dr. Bart Pieters, b.pieters@fz-juelich.de.