S-Space College of Engineering/Engineering Practice School (공과대학/대학원) Dept. of Material Science and Engineering (재료공학부) Journal Papers (저널논문_재료공학부)
Bilayer order in a polycarbazole-conjugated polymer
- Lu, Xinhui; Hlaing, Htay; Germack, David S.; Peet, Jeff; Jo, Won Ho; Andrienko, Denis; Kremer, Kurt; Ocko, Benjamin M.
- Issue Date
- NATURE PUBLISHING GROUP
- NATURE COMMUNICATIONS Vol.3 No.1790, pp. 1-7
- One of the best performing semiconducting polymers used in bulk heterojunction devices is PCDTBT, a polycarbazole derivative with solar-conversion efficiencies as high as 7.2%. Here we report the formation of bilayer ordering in PCDTBT, and postulate that this structural motif is a direct consequence of the polymer's molecular design. This bilayer motif is composed of a pair of backbones arranged side-to-side where the alkyl tails are on the outer side. This is in stark contrast to the monolayer ordering found in other conjugated polymers. The crystalline bilayer phase forms at elevated temperatures and persists after cooling to room temperature. The existence of bilayer ordering, along with its high-packing fraction of conjugated moieties, may guide the synthesis of new materials with improved optoelectronic properties.
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