Abstract
A series of thienothiophene-benzotriazole-based semicrystalline copolymers, PTTBTz, PTTBTz- F, and PTTBTz-OR, were synthesized by considering chain linearity, planarity and inter-chain packing by virtue of non-covalent attractive interaction. Fluorine and alkoxy substituents were introduced to modulate the intra- and inter-chain coulombic interactions and crystalline ordering. The fluorine and alkoxy-substituted PTTBTz-F and PTTBTz-OR showed pronounced inter-chain packing with edge-on orientation confirmed by UV-vs absorption and X-ray diffraction measurements. The well-resolved diffraction patterns were obtained for PTTBTz-F and PTTBTz-OR, showing (100)∼(500) inter-lamellar scattering peaks (d-spacing, 17∼18 Å) in the out-of-plane direction and a π-π stacking peak (d-spacing, 3.5∼4.1 Å) in the in-plane direction. Organic field effect transistor (OFET) devices were fabricated with a bottom gate and top contact geometry. PTTBTz-F (μh =4.49 ×10-2cm2 V-1 s-1, on/off ratio =1.13 ×107) and PTTBTz-OR (μh =8.39 ×10-3 cm2 V-1 s-1, on/off ratio =2.98 ×104) showed nearly 3 and 2 orders of magnitude higher hole mobility upon annealing at 305 and 260 °C, with compared to the unsubstituted PTTBTz.
Original language | English |
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Pages (from-to) | 1293-1302 |
Number of pages | 10 |
Journal | Pure and Applied Chemistry |
Volume | 86 |
Issue number | 8 |
DOIs | |
Publication status | Published - 2014 Aug 20 |
Externally published | Yes |
Keywords
- ICFPAM-2013
- Optoelectronics
- Organic field-effect transistors
- Semiconductors
- X-ray diffraction
ASJC Scopus subject areas
- Chemistry(all)
- Chemical Engineering(all)