Importance of Solubilizing Group and Backbone Planarity in Low Band Gap Polymers for High Performance Ambipolar field-effect Transistors

Journal Article · Wed Jun 13 04:00:00 EDT 2012 · Chemistry of Materials

DOI:https://doi.org/10.1021/cm2037487· OSTI ID:1043081

Lee, Joong Suk; Son, Seon Kyoung; Song, Sanghoon; Kim, Hyunjung; Lee, Dong Ryoul; Kim, Kyungkon; Ko, Min Jae; Choi, Dong Hoon; Kim, BongSoo; Cho, Jeong Ho ^[1]

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1. UST-Korea

We investigated the performance of ambipolar field-effect transistors based on a series of alternating low band gap polymers of oligothiophene and diketopyrrolopyrrole (DPP). The polymers contain oligothiophene units of terthiophene [T3] and thiophene-thienothiophene-thiophene [T2TT] and DPP units carrying branched alkyl chains of 2-hexyldecyl [HD] or 2-octyldodecyl [OD]. The structural variation allows us to do a systematic study on the relationship between the interchain stacking/ordering of semiconducting polymers and their resulting device performance. On the basis of synchrotron X-ray diffraction and atomic force microscopy measurements on polymer films, we found that longer branched alkyl side chains, i.e., OD, and longer and more planar oligothiophene, i.e., T2TT, generate the more crystalline structures. Upon thermal annealing, the crystallinity of the polymers was largely improved, and polymers containing a longer branched alkyl chain responded faster because longer alkyl chains have larger cohesive forces than shorter chains. For all the polymers, excellent ambipolar behavior was observed with a maximum hole and electron mobility of 2.2 and 0.2 cm{sup 2} V{sup -1} s{sup -1}, respectively.

• Research Organization: Advanced Photon Source (APS), Argonne National Laboratory (ANL), Argonne, IL (US)
• Sponsoring Organization: FOREIGN
• OSTI ID: 1043081
• Journal Information: Chemistry of Materials, Journal Name: Chemistry of Materials Journal Issue: 7 Vol. 24; ISSN 0897-4756
• Country of Publication: United States
• Language: ENGLISH

Related Subjects

36 MATERIALS SCIENCE
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
ANNEALING
ATOMIC FORCE MICROSCOPY
CARRIER MOBILITY
CHAINS
ELECTRON MOBILITY
PERFORMANCE
POLYMERS
SYNCHROTRONS
TRANSISTORS
X-RAY DIFFRACTION