Abstract
Two D-A alternating π-conjugated copolymers bearing diketopyrrolopyrrole (DPP) and sextetthiophene with different molecular weights were synthesized to investigate their physical properties and performance in thin-film transistors and photovoltaic cells. The solubility and molecular weight (MW) of these copolymers with a highly rigid backbone were improved by controlling the feeding ratio of the monomer in the polymerization mixture. These polymers exhibited high crystallinity with a predominant edge-on chain orientation on the substrate. The higher-MW P(DPP-6T)-2 copolymer displayed a higher hole mobility of 3.26 cm2 V-1 s-1 than the low-MW P(DPP-6T)-1 copolymer. Bulk heterojunction photovoltaic cells made of a blend of P(DPP-6T)-2 and (6,6)-phenyl C71-butyric acid methyl ester displayed good device performance with a power conversion efficiency of 4.68%.
Original language | English |
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Pages (from-to) | 77-84 |
Number of pages | 8 |
Journal | Polymer |
Volume | 83 |
DOIs | |
Publication status | Published - 2016 Jan 28 |
Keywords
- Diketopyrrolopyrrole
- Photovoltaic cell
- Thin film transistor
ASJC Scopus subject areas
- Organic Chemistry
- Polymers and Plastics
- Materials Chemistry