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

Title
Importance of Solubilizing Group and Backbone Planarity in Low Band Gap Polymers for High Performance Ambipolar field-effect Transistors
Authors
이중석손선경송상훈김현정이동렬김경곤고민재최동훈김봉수조정호
Keywords
Organic transistor; Ambipolar transistor; Carrier mobility; Inverter; Low band gap polymers; polymer field-effect transistors; crystalline structure; high carrier mobility
Issue Date
2012-04
Publisher
Chemistry of materials
Citation
VOL 24, NO 7, 1316-1323
Abstract
We investigated the performance of ambipolar fieldeffect 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 thiophenethienothiophene- 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 cm2 V−1 s−1, respectively.
URI
http://pubs.kist.re.kr/handle/201004/44667
ISSN
08974756
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