Conformation-Insensitive Ambipolar Charge Transport in a Diketopyrrolopyrrole-Based Co-polymer Containing Acetylene Linkages
SCIE
SCOPUS
- Title
- Conformation-Insensitive Ambipolar Charge Transport in a Diketopyrrolopyrrole-Based Co-polymer Containing Acetylene Linkages
- Authors
- Yun, HJ; Choi, HH; Kwon, SK; Kim, YH; Cho, K
- Date Issued
- 2014-07-08
- Publisher
- AMER CHEMICAL SOC
- Abstract
- A new donor acceptor organic semiconducting co-polymer (PDPP-TAT) containing acetylene linkages based on dithienyl-diketopyrrolopyrrole (tDPP) has been synthesized and compared with a tDPP-based co-polymer (PDPP-TVT) containing vinylene linkages. The sp-hybridized carbons in the acetylene linkages result in favorable overlap of the electron wave functions of the tDPP units along the main chain. Further, the pi-conjugation of PDPP-TAT was found to be highly insensitive to the chain conformation, in contrast to that of PDPP-TVT. As a result, PDPP-TAT provides favorable charge transport for electrons as well as holes, and enables facile charge transport in amorphous and tie-molecular regions connecting its crystalline domains. PDPP-TAT exhibits ambipolar characteristics with a high electron/hole mobility ratio (mu(e)/mu(h)) of similar to 0.3 in field-effect transistors, whereas PDPP-TVT exhibits unipolar characteristics with a mu(e)/mu(h) value that is a factor of 30 lower. Our results demonstrate that the conformation sensitivity of charge transport is a vital factor in the electrical performances of actual organic transistor devices.
- Keywords
- FIELD-EFFECT TRANSISTORS; THIN-FILM TRANSISTORS; BAND-GAP POLYMERS; HIGH-MOBILITY; ORGANIC SEMICONDUCTOR; CONJUGATED POLYMERS; PRINTED TRANSISTORS; CHEMICAL-STRUCTURE; HIGH HOLE; ELECTRON
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/14082
- DOI
- 10.1021/CM5014703
- ISSN
- 0897-4756
- Article Type
- Article
- Citation
- CHEMISTRY OF MATERIALS, vol. 26, no. 13, page. 3928 - 3937, 2014-07-08
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