PC61BM devices was investigated by a pulsed measurement technique in order to prevent disturbing influences due to device heating under continous illumination. Finally, we perform calculations to quantify the stabilization effect by optical screening, and demonstrate it to play only a minor role as well. Furthermore, the electronic structure of the A-D-A scaffold should be modified by the replacing the DCV acceptor moieties by 1- 1,1-dicyanomethylene -cyclohexene DCC units, in order to shift the absorption towards longer wavelength for an enhanced light harvest. Circuital model validation for S-shaped organic solar cells by means of impedance spectroscopy Romero, B. Pz Photoconduction and photovoltaic effects. C60 Solar Cells
The resulting photocurrent was hyperbolic tangent like and featured a point symmetry, whose origin and meaning were discussed. Within a series of eleven different fullerenes, multi-substituted fullerenes as well as Cbased fullerenes are observed not to undergo dimerization, in contrast to all mono-substituted Cfullerenes. Ein wichtiger Faktor ist dabei der Photostrom einer Solarzelle, der als Differenz zwischen Hell- und Dunkelstrom definiert ist. Ethanedithiol treatment of solution-processed ZnO thin films: Luminescence spectroscopy and thin-film interference effects in organic solar cells: Author s All words At least one word None of the words. Finally, the formation of different photogenerated species and their kinetics in PC60BM films and blends with polymer is studied by ultrafast transient absorption spectroscopy.
Promising long-term stability of encapsulated ITO-free bulk-heterojunction organic solar cells under different aging conditions Sapkota, S.
The first approach will be based on a previous project dealing with the synthesis of a series of oligothiophenes consisting of an A-D-A system comprising a central dithieno[3: Barriers and Schottky contacts. This mainly qualitative approach allows for an identification of dominating processes and provides microscopic explanations.
That is why several OPV startup companies were launched in the last decade. Organic photovoltaics OPV is a field of applied research which has been growing rapidly in the last decade leading to a current record value of power-conversion efficiency of 10 percent.
Comparison with standard device architecture Arredondo, B. Characterization of tandem organic solar cells Timmreck, R. In case of organic bulk heterojunction BHJ solar cells it is — in contrast to inorganic devices — dependent on the applied bias voltage. Elektrische Effekte sind an der Strom-Spannungskennlinie I-U sichtbar, die in dieser Arbeit als Hauptvergleichspunkt zwischen experimentellen Solarzellendaten und den Simulationsergebnissen dient.
It is evidenced that quenching of the polymer singlet-excited states does not lead to a significant stabilization. Moreover, the photo-transformation yield of PC60BM in thin films is shown to be independent of the photon energy and exhibits first-order dependence on the incident photon flux density.
The reason is an imbalance in charge-carrier mobilities which can be influenced by the mixing ratio. The dimerization yield is demonstrated to mainly depend on the morphology of the bulk-heterojunction, that is to say: Finally, the results obtained in the framework of the MOPS-project Massengedruckte Organische Papier-Solarzellen will be presented, in which the first completely roll-to-roll printed paper solar cells were realized.
Nach der makroskopischen Betrachtung des Photostroms wird sich der Fokus dann auf die grundlegenden, den Photostrom bestimmenden Prozesse verschieben: Contact Imprint Sitemap Deutsch. Influence of hole extraction efficiency on the performance and stability of organic solar cells Ecker, B.
Finally, the formation of different photogenerated species and their kinetics in PC60BM films and blends with polymer is studied by ultrafast transient absorption spectroscopy. Luminescence spectroscopy and thin-film interference effects in organic solar cells: Performance of Organiwche inverted organic bulk heterojunction photodetectors: This work focuses on the electrical processes in organic solar cells developing and employing a otganische drift-diffusion model.
Circuital model validation for S-shaped organic solar cells by means of impedance spectroscopy Romero, B. These findings were set into relation to current—voltage characteristics in order to orgganische the origin of the clear differences in the solar cell performance of both materials.
Additional Person s All words At least one word None of the words. Reiternavigation Alle ausklappen Alle einklappen. Die organische Photovoltaik ist ein Forschungsgebiet, dem in den letzten zehn Jahren enorme Aufmerksamkeit zu Teil wurde.
OPUS Würzburg | Photocurrent in Organic Solar Cells
Influence of the acceptor on electrical perfomance and charge carrier transport in bulk heterojunction solar cells with HXS-1 Ahme, H. This junction can be realized by two distinct layers forming a planar heterojunction or by an intermixed film of donor and acceptor, resulting in a bulk heterojunction.
Due to the variety of reasons for S-kinks, methods and criteria for a distinction are proposed. One important factor influencing the device efficiency is the photocurrent of a solar cell, which is defined as the difference between the current under illumination and in the dark. Electron-selective contacts via ulta-thin organic interface dipoles for dizsertation organic heterojunction solar cells Reichel, C.
The second approach will focus on the design and synthesis of A-D-A-D-A-type oligothiophenes based on a previously developed oligomer comprising thieno[2,3-c]pyrrole-4,6-dione TPD as core acceptor, endowed with two electron-donating DTP moieties, and end-capped with DCV units.
The first one — via a thermalized charge transfer state CTS — is clearly influenced by geminate recombination and therefore less efficient. An orfanische dissociation of excitons is provided by a heterojunction of two molecules with different frontier orbital energies, such that the electron is transfered to the electron acceptor and the positive solqrzelle hole remains on the donor molecule.
Extraction of physical parameters by means of markov chain Monte Carlo techniques Raba, A.
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