Speaker
Mrs
Perez-Rodriguez Ana
(ICMAB)
Description
Bulk heterojunctions (BHJs), in which electron–donor and electron–acceptor material are blended together from a common solution, represent the most promising device structure for high-efficiency organic solar cells. It is has been shown that BHJs solar cells can reach higher efficiencies and fill factors by controlling the morphology applying solvent vapor annealing treatments (SVA) [1]. In this technique, the solvent vapor penetrates into the blend re-organizing the donor-acceptor arrangement. A powerful tool to study these changes in the morphology is grazing incidence wide angle X-ray scattering (GIWAXS) with a synchrotron source. In this work, 2D- GIWAXS is employed to investigate the effect of the solvent annealing on the structure of BHJs formed by two oligothiphenes (donor) with [6,6]-phenyl C71-butyric acid methyl ester(PC71BM) (acceptor) [1]. In addition, the incident angle was varied in order to obtain depth-resolved information of the structure. The structural results are correlated with the photovoltaic performance of the solar cells.
References
[1] Cordula D. Wessendorf et al. “Efficiency Improvement of Solution-Processed Dithienopyrrole-Based A-D-A Oligothiophene Bulk- Heterojunction Solar Cells by Solvent Vapor Annealing” Adv. Energy Mater. 2014, 1400266
Primary author
Mrs
Perez-Rodriguez Ana
(ICMAB)
Co-authors
Dr
Ahlswede Erik
(Lichttenchnisches Institut (Karlsruhere Institut für Technologie), Campus Sud, 76131 Karlsruhe,Germany)
Dr
D. Wessendorf Cordula
(Zentrum für Sonnenenergie- und Wasserstoff-Forschung Baden-Württemberg (ZSW), Industriestraße 6, 70565 Stuttgart, Germany)
