Grancini G.,Italian Institute of Technology |
Maiuri M.,CNR Institute for Photonics and Nanotechnologies |
Fazzi D.,Italian Institute of Technology |
Petrozza A.,Italian Institute of Technology |
And 5 more authors.
Nature Materials | Year: 2013
The standard picture of photovoltaic conversion in all-organic bulk heterojunction solar cells predicts that the initial excitation dissociates at the donor/acceptor interface after thermalization. Accordingly, on above-gap excitation, the excess photon energy is quickly lost by internal dissipation. Here we directly target the interfacial physics of an efficient low-bandgap polymer/PC 60 BM system. Exciton splitting occurs within the first 50fs, creating both interfacial charge transfer states (CTSs) and polaron species. On high-energy excitation, higher-lying singlet states convert into hot interfacial CTSs that effectively contribute to free-polaron generation. We rationalize these findings in terms of a higher degree of delocalization of the hot CTSs with respect to the relaxed ones, which enhances the probability of charge dissociation in the first 200fs. Thus, the hot CTS dissociation produces an overall increase in the charge generation yield.
Gaudiana R.,Konarka Technologies
Journal of Polymer Science, Part B: Polymer Physics | Year: 2012
Challenges remain overcome on the road to manufacturing stable, high-performance organic photovoltaic modules in high volume at low cost. The major challenges are centered on stability to high-intensity solar radiation, which represents one of the many accelerated aging tests, and module efficiency. Several of the underlying problems for both of these will be discussed in the text, and some will be addressed in the following papers. © 2012 Wiley Periodicals, Inc.
Konarka Technologies | Date: 2011-04-08
Methods of preparing photovoltaic modules, as well as related components, systems, and devices, are disclosed.
Konarka Technologies and Osram | Date: 2011-01-05
The invention relates to a material for applying thin organic layers having a specifically adjustable conductivity. Said material comprises at least one mixture of two different fractions of a functional polymer, preferably in a solvent, and is used, for example, with the aid of various application techniques, as a functional layer for an organic electronic component.
Konarka Technologies and Merck Patent Gesellschaft Mit Beschrankter Haftung | Date: 2012-11-30
The invention relates to novel formulations comprising an organic semiconductor (OSC) and a conductive additive, to their use as conducting inks for the preparation of organic electronic (OE) devices, especially organic photovoltaic (OPV) cells, to methods for preparing OE devices using the novel formulations, and to OE devices and OPV cells prepared from such methods and formulations.