Effect of methyl substitution on the diketopyrrolopyrrole-based semiconducting polymers for organic thin film transistors
| Autor: | Hee Su Kim, Seon Baek Lee, Do-Hoon Hwang, Eunjoo Song, In-Nam Kang, Kilwon Cho |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
chemistry.chemical_classification
Electron mobility Materials science Annealing (metallurgy) 02 engineering and technology General Chemistry Polymer 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics Electrochemistry 01 natural sciences Acceptor 0104 chemical sciences Electronic Optical and Magnetic Materials Biomaterials Crystallography chemistry.chemical_compound chemistry Thin-film transistor Materials Chemistry Thiophene Electrical and Electronic Engineering 0210 nano-technology HOMO/LUMO |
| Zdroj: | Organic Electronics. 56:129-138 |
| ISSN: | 1566-1199 |
| DOI: | 10.1016/j.orgel.2018.01.039 |
| Popis: | Two semiconducting polymers, poly[2,5-bis(5-octylpentadecyl)-3,6-di(thiophen-2-yl)pyrrolo[3,4-c]pyrrole-1,4(2H,5H)-dione-selenophene] (PDPP-Se) and poly[3,6-bis(4-methylthiophen-2-yl)-2,5-bis(5-octylpentadecyl)pyrrolo[3,4-c]pyrrole-1,4(2H,5H)-dione-selenophene] (PMDPP-Se) were designed and synthesized. These polymers contain diketopyrrolopyrrole (DPP) and methyl-substituted DPP (MDPP) units as the acceptor building blocks, and selenophene as a counter donor unit. The introduction of methyl groups on the thiophene units flanked by the DPP core substantially affected its optical, electrochemical, and charge-transporting properties. Experimental results revealed that the introduction of electron-donating methyl groups raised the highest occupied molecular orbital (HOMO) and lowest unoccupied molecular orbital (LUMO) energy levels of PMDPP-Se. Interestingly, the PMDPP-Se showed better co-planarity with the adjacent aromatic groups compared to PDPP-Se. Furthermore, the methyl-substituted polymer showed a transition behavior in its thin film morphology and crystal orientation with an increase in the annealing temperature, which induced an M-shape dependence of the field-effect mobility on the annealing temperature. PMDPP-Se recorded a maximum hole mobility μh = 1.31 cm2 V−1 s−1 at optimum phase, which is higher than that of PDPP-Se (μh = 0.86 cm2 V−1 s−1). |
| Databáze: | OpenAIRE |
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