Anisotropic Charge-Carrier Transport in High-Mobility Donor-Acceptor Conjugated Polymer Semiconductor Films

Zhiyuan Zhao; Hongtao Liu; Yan Zhao; Cheng Cheng; Jing Zhao; Qingxin Tang; Guangyu Zhang; Yunqi Liu

doi:10.1002/asia.201600082

Anisotropic Charge-Carrier Transport in High-Mobility Donor-Acceptor Conjugated Polymer Semiconductor Films

Chem Asian J. 2016 Oct 6;11(19):2725-2729. doi: 10.1002/asia.201600082. Epub 2016 May 4.

Authors

Zhiyuan Zhao¹, Hongtao Liu², Yan Zhao², Cheng Cheng², Jing Zhao³, Qingxin Tang⁴, Guangyu Zhang³, Yunqi Liu⁵

Affiliations

¹ Key Laboratory of UV-Emitting Materials and Technology under Ministry of Education, Northeast Normal University, Changchun, 130024, P.R. China.
² Beijing National Laboratory for Molecular Science, Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190, P.R. China.
³ Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, P.R. China.
⁴ Key Laboratory of UV-Emitting Materials and Technology under Ministry of Education, Northeast Normal University, Changchun, 130024, P.R. China. tangqx@nenu.edu.cn.
⁵ Beijing National Laboratory for Molecular Science, Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190, P.R. China. liuyq@iccas.ac.cn.

PMID: 27027484
DOI: 10.1002/asia.201600082

Abstract

Many high-performance solution-processable polymer thin-film transistors (PTFTs) have been reported. This contribution presents a comparative study of oriented films that have been deposited by means of solution shearing (SS) with charge-carrier transport anisotropy for PTFTs based on a diketopyrrolopyrrole-thiazolothiazole donor-acceptor copolymer (PDPPTzBT). The maximum field-effect mobility of the SS film of PDPPTzBT was 10.00 cm² V^-1 s. We also blended a solution of PDPPTzBT with a solution of polystyrene (PS). Solvent vapor annealing (SVA) lateral phase separation was adopted to block carrier transport in the direction of π-π stacking, and further evidence of charge transport anisotropy was provided. Highly oriented polymer films will further influence the carrier transport anisotropy and promote carrier transport along the backbone, and the performance of the field-effect transistor is thus improved.

Keywords: charge transport; donor-acceptor systems; polymers; solution shearing; thin films.