In situ monitoring of structure formation in the active layer of polymer solar cells during roll-to-roll coating

Lea Hildebrandt Rossander, Natalia Klaudia Zawacka, Henrik Friis Dam, Frederik C Krebs, Jens Wenzel Andreasen

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Abstract

The active layer crystallization during roll-to-roll coating of organic solar cells is studied in situ. We developed an X-ray setup where the coater unit is an integrated part of the small angle X-ray scattering instrument, making it possible to control the coating process while recording scattering measurements in situ, enabling us to follow the crystal formation during drying. By varying the distance between the coating head and the point where the X-ray beam hits the film, we obtained measurements of 4 different stages of drying. For each of those stages, the scattering from as long a foil as possible is summed together, with the distance from coating head to scattering point kept constant. The results are average crystallographic properties for the active layer coated on a 30 m long foil. With this insight into the dynamics of crystallization in a roll-coated polymer film, we find that the formation of textured and untextured crystallites seems uncorrelated, and happens at widely different rates. Untextured P3HT crystallites form later in the drying process than expected which may explain previous studies speculating that untextured crystallization depends on concentration. Textured crystallites, however, begin forming much earlier and steadily increases as the film dries, showing a development similar to other in situ studies of these materials.
Original languageEnglish
JournalA I P Advances
Volume4
Issue number8
Pages (from-to)087105
Number of pages1
ISSN2158-3226
DOIs
Publication statusPublished - 2014

Bibliographical note

© 2014 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution 3.0 Unported License.

Projects

Danish-Chinese Center for Organic based Photovoltaic Cells with Morphology Control

Oksbjerg, B., Trofod, T., Bundgaard, E., Andreasen, J. W., Norrman, K., Krebs, F. C., Zawacka, N. K., Jørgensen, M., Angmo, D., Andersen, T. R., Bentzen, J. J. & Rossander, L. H.

31/08/201031/08/2016

Project: Research

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