High-Performance Hole Transport and Quasi-Balanced Ambipolar OFETs Based on D-A-A Thieno-benzo-isoindigo Polymers
Journal article, 2016

Two new conjugated polymers are synthesized based on a novel donor-acceptor-acceptor (D-A-A) design strategy with the intention of attaining lower lowest unoccupied molecular obital levels compared to the normally used D-A strategy. By coupling two thieno-benzo-isoindigo units together via the phenyl position to give a new symmetric benzene-coupled di-thieno-benzo-isoindigo (BdiTBI) monomer as an A-A acceptor and thiophene (T) or bithiophene (2T) as a donor, two new polymers PT-BdiTBI and P2T-BdiTBI are synthesized via Stille coupling. The two polymers are tested in top gate and top contact field effect transistors, which exhibit balanced ambipolar charge transport properties with poly(methyl methacrylate) as dielectric and a high hole mobility up to 1.1 cm(2) V-1 s(-1) with poly(trifluoroethylene) as dielectric. The polymer films are investigated using atomic force microscopy, which shows fibrous features due to their high crystallinity as indicated by grazing incidence wide-angle X-ray scattering. The theoretical calculations agree well with the experimental data on the energy levels. It is demonstrated that the D-A-A strategy is very effective for designing low band gap polymers for organic electronic applications.

conjugated polymers

high mobility

ambipolar

organic field effect transistors

donor-acceptor-acceptor strategy

Author

David James

Chalmers, Chemistry and Chemical Engineering, Applied Chemistry, Polymer Technology

S. H. Wang

Linköping University

W. Ma

Xi'an Jiaotong University

Svante Hedström

Lund University

X. Y. Meng

Xi'an Jiaotong University

P. Persson

Lund University

S. Fabiano

Linköping University

X. Crispin

Linköping University

Mats Andersson

Chalmers, Chemistry and Chemical Engineering, Applied Chemistry, Polymer Technology

M. Berggren

Linköping University

Ergang Wang

Chalmers, Chemistry and Chemical Engineering, Applied Chemistry, Polymer Technology

Advanced Electronic Materials

2199-160X (ISSN)

Vol. 2 4

Subject Categories

Polymer Chemistry

DOI

10.1002/aelm.201500313

More information

Latest update

3/14/2018