A method is presented to manipulate the final morphology of roll-to-roll slot-die coated poly(3-hexylthiophene) (P3HT) by optically exciting the p-type polymer in solution while coating. These results provide a comprehensive picture of the entire knowledge chain, from demonstrating how to apply the authors’ method to a fundamental understanding of the changes in morphology and physical properties induced by exciting P3HT while coating. By combining results from density functional theory and molecular dynamics simulations with a variety of X-ray experiments, absorption spectroscopy, and THz spectroscopy, the relationship between morphology and physical properties of the thin film is demonstrated. Specifically, in P3HT films excited with light during deposition, changes in crystallinity and texture with more face-on orientation and increased out-of-plane charge mobility are observed.
|Journal||Advanced Functional Materials|
|Number of pages||10|
|Publication status||Published - 2023|
Bibliographical noteThe authors acknowledge financial support from the H2020 European Research Council through the SEEWHI Consolidator grant, ERC-2015-CoG-681881 and from the Independent Research Fund Denmark, grant no. 0200-00001B and grant no. 9040-00360B (ULTRA-TED). Danscatt for travel expenses during beam times: DESY proposal number 15559230912. SAXS measurements were carried out at the P03/MiNaXS beamline, PETRA III at DESY. Neutron beam time at MLZ, proposal-15551’’. Some WAXS experiments were carried out at the cSAXS beamline, Paul Scherrer Institute, Switzerland, proposal number 20182246. Deuterated SD-P3HT was synthesized at the Center for Nanophase Materials Sciences, which is a DOE Office of Science User Facility (CNMS Proposal ID: CNMS2020-R-00546), Kristian Larsen for countless hours of technical support.
- Density functional theory
- Led light treatment
- Molecular dynamics
- Organic semiconductors
- Roll-to-roll slot-die coating
- Thz spectroscopy