Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 6, Issue 22, Pages 19477-19481Publisher
AMER CHEMICAL SOC
DOI: 10.1021/am505280a
Keywords
side chain; benzo[1,2-b:4,5-b ']dithiophene; thieno[3,4-c]pyrrole-4,6-dione; pi-conjugated polymers; polymer crystallite; backbone orientation
Funding
- King Abdullah University of Science and Technology (KAUST)
- Center for Advanced Molecular Photovoltaics (CAMP) by King Abdullah University of Science and Technology [KUS-C1-015-21]
Ask authors/readers for more resources
Alkyl substituents appended to the pi-conjugated main chain account for the solution-processability and film-forming properties of most pi-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']dithiophenealtthieno[3,4-c]pyrrole-4,6-dione) (PBDTTPD) polymers can (i) influence the propensity of the polymer to order in the pi-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 pi-stacking direction, are believed to be a key contributor to improved thin-film device performance in both FETs and BHJ solar cells.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available