Incorporation of fused tetrathiafulvalene units in a DPP–terthiophene copolymer for air stable solution processable organic field effect transistors

Cortizo-Lacalle, D., Arumugam, S., Elmasly, S., Kanibolotsky, A. L., Findlay, N. J. , Inigo, A. R. and Skabara, P. J. (2012) Incorporation of fused tetrathiafulvalene units in a DPP–terthiophene copolymer for air stable solution processable organic field effect transistors. Journal of Materials Chemistry, 22, 11310. (doi: 10.1039/C2JM31502E)

Abstract

A new terthiophene–diketopyrrolopyrrole (DPP) copolymer has been synthesised in which the central thiophene ring within the terthiophene repeat unit is attached to a fused tetrathiafulvalene (TTF). The electrochemical and absorption data of the polymer, p(DPP-TTF), are presented, and the multi-redox states are investigated by UV-vis spectroelectrochemistry. Bottom gate/bottom contact field effect transistors were fabricated from films of p(DPP-TTF) annealed at 200 °C. The material, which under these conditions forms a fibrous structure, exhibited hole mobilities of 4 ± 2 × 10−2 cm2 V−1 s−1 with an on/off ratio of 1 × 104. The transistors showed little sign of degradation over 15 days of exposure under ambient conditions, demonstrating excellent air-stability. This characteristic is attributed to the incorporation of the TTF unit into the polymer.

• Item Type: Articles
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Skabara, Professor Peter and Kanibolotskyy, Dr Oleksandr and Findlay, Dr Neil
• Authors: Cortizo-Lacalle, D., Arumugam, S., Elmasly, S., Kanibolotsky, A. L., Findlay, N. J., Inigo, A. R., and Skabara, P. J.
• College/School: College of Science and Engineering > School of Chemistry
• Journal Name: Journal of Materials Chemistry
• Publisher: Royal Society of Chemistry
• ISSN: 0959-9428
• ISSN (Online): 1364-5501
• Published Online: 02 May 2012