Dependence of crystallite formation and preferential backbone orientations on the side chain pattern in PBDTTPD polymers
AuthorsEl Labban, Abdulrahman
Tassone, Christopher J.
Toney, Michael F.
KAUST DepartmentKAUST Solar Center (KSC)
Physical Sciences and Engineering (PSE) Division
Biological and Environmental Sciences and Engineering (BESE) Division
Chemical Science Program
Permanent link to this recordhttp://hdl.handle.net/10754/563873
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Abstract(Figure Presented) Alkyl substituents appended to the π-conjugated main chain account for the solution-processability and film-forming properties of most π-conjugated polymers for organic electronic device applications, including field-effect transistors (FETs) and bulk-heterojunction (BHJ) solar cells. Beyond film-forming properties, recent work has emphasized the determining role that side-chain substituents play on polymer self-assembly and thin-film nanostructural order, and, in turn, on device performance. However, the factors that determine polymer crystallite orientation in thin-films, implying preferential backbone orientation relative to the device substrate, are a matter of some debate, and these structural changes remain difficult to anticipate. In this report, we show how systematic changes in the side-chain pattern of poly(benzo[1,2-b:4,5-b′]dithiophene-alt-thieno[3,4-c]pyrrole-4,6-dione) (PBDTTPD) polymers can (i) influence the propensity of the polymer to order in the π-stacking direction, and (ii) direct the preferential orientation of the polymer crystallites in thin films (e.g., "face-on" vs "edge-on"). Oriented crystallites, specifically crystallites that are well-ordered in the π-stacking direction, are believed to be a key contributor to improved thin-film device performance in both FETs and BHJ solar cells.
SponsorsThe authors acknowledge financial support under Baseline Research Funding from King Abdullah University of Science and Technology (KAUST). Part of this work was supported by the Center for Advanced Molecular Photovoltaics (CAMP) (Award KUS-C1-015-21) made possible by King Abdullah University of Science and Technology. The authors thank KAUST Analytical Core Laboratories for mass spectrometry and elemental analyses. Portions of this research were carried out at the Stanford Synchrotron Radiation Lightsource user facility, operated by Stanford University on behalf of the U.S. Department of Energy, Office of Basic Energy Sciences.
PublisherAmerican Chemical Society (ACS)
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