title: Diketopyrrolopyrrole Polymers with Thienyl and Thiazolyl Linkers for Application in Field-Effect Transistors and Polymer Solar Cells.
abstract: Conjugated polymers consisting of diketopyrrolopyrrole (DPP) units have been successfully applied in field-effect transistors (FETs) and polymer solar cells (PSCs), while most of the DPP polymers were designed as symmetric structures containing identical aromatic linkers. In this manuscript, we design a new asymmetric DPP polymer with varied aromatic linkers in the backbone for application in FETs and PSCs. The designation provides the chance to finely adjust the energy levels of conjugated polymers so as to influence the device performance. The asymmetric polymer exhibits highly crystalline properties, high hole mobilities of 3.05 cm2V-1s-1in FETs, and a high efficiency of 5.9% in PSCs with spectra response from 300 to 850 nm. Morphology investigation demonstrates that the asymmetric polymer has a large crystal domain in blended thin films, indicating that the solar cell performance can be further enhanced by optimizing the microphase separation. The study reveals that the asymmetric design via adjusting the aromatic linkers in DPP polymers is a useful route toward flexible electronic devices.
authors.affiliation: College of Chemistry and Environmental Science, Hebei University , Baoding 071002, China.|Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences , Beijing 10090, China.
authors.forename: Yaping
authors.initials: Y
authors.lastname: Yu
authors.affiliation: State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University , Xi'an 710049, People's Republic of China.
authors.forename: Yang
authors.initials: Y
authors.lastname: Wu
authors.affiliation: Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences , Beijing 10090, China.
authors.forename: Andong
authors.initials: A
authors.lastname: Zhang
authors.affiliation: Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences , Beijing 10090, China.
authors.forename: Cheng
authors.initials: C
authors.lastname: Li
authors.affiliation: Institut für Angewandte Photophysik, Technische Universität Dresden , George-Bähr-Strasse 1, 01069 Dresden, Germany.
authors.forename: Zheng
authors.initials: Z
authors.lastname: Tang
authors.affiliation: State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University , Xi'an 710049, People's Republic of China.
authors.forename: Wei
authors.initials: W
authors.lastname: Ma
authors.affiliation: College of Chemistry and Environmental Science, Hebei University , Baoding 071002, China.
authors.forename: Yonggang
authors.initials: Y
authors.lastname: Wu
authors.affiliation: Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences , Beijing 10090, China.
authors.forename: Weiwei
authors.initials: W
authors.lastname: Li
keywords: asymmetric polymer; conjugated polymer; crystalline; diketopyrrolopyrrole; field-effect transistors; polymer solar cells