Promising long-term stability of encapsulated ITO-free bulk-heterojunction organic solar cells under different aging conditions Sapkota, S. Finally, the formation of different photogenerated species and their kinetics in PC60BM films and blends with polymer is studied by ultrafast transient absorption spectroscopy. In the first part of this thesis, we investigate the degradation of organic solar cells under photo-oxidative conditions. Within the range of semiconducting pn-junctions, Mott—Schottky analysis is an established method to determine the built-in potential. The reason is an imbalance in charge-carrier mobilities which can be influenced by the mixing ratio. A comparison of experimental and simulation data indicates that the reason is a changed donor-acceptor energy gap caused by a shift of the ionization potential of ZnPc.
Externe Quanteneffizienzmessungen an organischen Tandemsolarzellen
This dissertation constitutes a detailed study of the degradation behavior of organic photovoltaics under different ambient conditions, with particular focus on the role of the fullerene in all processes.
After investigation of the optoelectronic properties and the influence of the different structural modifications on the molecular properties, suitable candidates will be tested as donor materials in BHJSC. Nach der makroskopischen Betrachtung des Photostroms wird sich der Fokus solarzelle auf die grundlegenden, den Photostrom bestimmenden Prozesse verschieben: The electrical model developed here is orgaanische with an optical model and covers the diffusion of excitons, their separation, and the subsequent transport of charges.
A quite new approach to low-cost mass production of flexible solar cells are organic photovoltaics.
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This results in a fill factor dependent on the absorption profile. Within the range of semiconducting pn-junctions, Mott—Schottky analysis is an established method to determine the built-in potential.
In addition, detailed investigations on the photo-degradation behavior of PC60BM and other fullerenes in both neat films and dissertahion films with polymers are performed under different conditions.
In contrast to inorganics, charge-carrier mobilities are low in the investigated materials and charge transport is strongly affected by energy barriers at the electrodes. Abstract EN This thesis deals with the device physics of organic solar cells.
In addition, the photocurrent was described by a combined model of Braun—Onsager and Sokel—Hughes theory for field dependent polaron pair dissociation and charge extraction, respectively. Uwe Rau BetreuerIn Prof.
This publication list has been generated from the publication database Fraunhofer-Publica.
At Surface states, band structure, electron density of states. Finally, the results obtained in the framework of the MOPS-project Organjsche Organische Papier-Solarzellen will be presented, in which the first completely roll-to-roll printed paper solar cells were realized. Comparison with standard device architecture Arredondo, B. Therefore, the J-V curve is selected as means of comparison between systematic series of simulation and experimental data. C60 devices in the last part of this work.
Organic photovoltaics OPV is a solarxelle 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. Pz Photoconduction and photovoltaic effects. C60 Solar Cells These findings were set into relation to current—voltage characteristics in order to discuss the origin of the clear differences in the solar cell performance of both materials.
The dimerization yield is demonstrated to mainly depend on the morphology of the bulk-heterojunction, that is to say: Electron-selective contacts via ulta-thin organic interface dipoles for silicon organic heterojunction solar cells Reichel, C.
Fulltext All words None of the words. In addition, clear differences in the nongeminate recombination dynamics of both material systems were found.
The reason is an imbalance in charge-carrier mobilities which can be influenced by dissertatikn mixing ratio. The second part of this work deals with the photo-degradation of organic photovoltaics under inert atmosphere. Layout flexibility for sheet-to-sheet produced flexible ITO-free organic solar modules with organic functional layers slot die coated under ambient atmospheric conditions Kaduwal, D.
For example, encapsulated solar cells based on PC60BM and the polymer poly[4,4′ bis 2-ethylhexyl dithieno[3,2-b: Determination of the intrinsic and the injection dependent charge carrier density in organic solar cells using the suns-VOC method Schiefer, Organischhe.