Record high mobilities for regioregular poly(3-octylthiophene)

Geneviève Sauvé; Junying Liu; Rui Zhang; Tomasz Kowalewski; Richard D. McCullough

doi:10.1117/12.735695

13 September 2007 Record high mobilities for regioregular poly(3-octylthiophene)

Geneviève Sauvé, Junying Liu, Rui Zhang, Tomasz Kowalewski, Richard D. McCullough

Proceedings Volume 6658, Organic Field-Effect Transistors VI; 665810 (2007) https://doi.org/10.1117/12.735695
Event: Photonic Devices + Applications, 2007, San Diego, California, United States

Abstract

Regioregular poly(3-alkylthiophene)s are promising candidates for plastic electronics. In particular, poly(3- hexylthiophene) (P3HT) has attracted considerable interest due to its excellent field effect mobility. However, not much attention has been given to poly(3-alkylthiophene)s with longer alkyl side chains, mainly because a few studies reported that longer side chain length was detrimental to field effect mobility. However, these past studies used untreated SiO₂ as the gate dielectric and commercially available polymers synthesized by the Rieke method. Here, all polymers tested were synthesized in house using our quasi-living GRIM method to yield well-defined clean polymers. For our first study, we synthesized P3HT and regioregular poly(3-octylthiohene) (P3OT), both with a high molecular weight (Mn of 40kDa and 35kDa, respectively). Regioregular P3HT required some sonication to dissolve in chloroform, whereas P3OT dissolved readily in chloroform at room temperature. Hole mobility was measured using bottom-contact geometry, with SiO₂ as gate dielectric. The SiO₂ surface was either untreated, or chemically treated with octyltrichlorosilane. Average mobility on untreated SiO₂ was 0.09 cm²/Vs for P3HT and 0.03 cm²/Vs for P3OT. Average mobility on OTS-8 treated SiO₂, on the other hand, was 0.13 cm²/Vs for P3HT and 0.19 cm²/Vs for P3OT. The OTS-8 treatment therefore dramatically improved the mobility of P3OT. Both polymers had a maximum mobility of about 0.2 cm²/Vs for channel lengths ≥10 μm, and a mobility of 0.22 cm²/Vs was obtained several times for P3OT. To our knowledge, this is by far the highest mobility reported for P3OT.

Citation Download Citation

Geneviève Sauvé, Junying Liu, Rui Zhang, Tomasz Kowalewski, and Richard D. McCullough "Record high mobilities for regioregular poly(3-octylthiophene)", Proc. SPIE 6658, Organic Field-Effect Transistors VI, 665810 (13 September 2007); https://doi.org/10.1117/12.735695

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