02/10/2020 03:30 PM
02/10/2020 04:30 PM
see meeting join link below
Bundesanstalt für Materialforschung und -prüfung and Diamond Light Source, UK
Please note the given time above is CEST (CEST = UTC + 2; BST = UTC + 1)
Effects of annealing and pressure on the Grazing Incidence X-ray Scatterings of Conjugated Polymer blends used in Organic Solar Cells
Dr Benjamin Agyei-Tuffour, University of Ghana, GH
This presentation shows the results of an experimental study of the effects of pressure and annealing on the conjugated polymer chain configurations in poly (3-hexylthiophene) and [6,6]-phenyl C61-butyric acid methyl ester (P3HT:PCBM) blends that are used in bulk heterojunction organic photovoltaic cells (OPVs). Annealing and the application of static loads on P3HT:PCBM blends on glass substrates were investigated. Microscopy and grazing incidence x-ray scattering techniques were adopted to analyze the surface morphologies, nano-/micro-structures and the chain configurations in the conjugated polymer blends. The OPV devices fabricated resulted in the I-V characteristics that have large dependence on the changes in the nano-/ micro-structures of the polymer blends. The pressure induced polymer chain configurations that were in the direction of the applied pressure (edge-on), led to a reduced lamellae spacing between the polymer units. This increased the crystallinity in the blend and played significant role in the organic solar cell performance. The findings of the study are discussed to influence the design and control of the nano-/micro-structures and the performance of bulk heterojunction organic solar cells.
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