title: Head-to-Head Linkage Containing Bithiophene-Based Polymeric Semiconductors for Highly Efficient Polymer Solar Cells.
abstract: Narrow bandgap (1.37-1.46 eV) polymers incorporating a head-to-head linkage containing 3-alkoxy-3'-alkyl-2,2'-bithiophene are synthesized. The head-to-head linkage enables polymers with sufficient solubility and the noncovalent sulfur-oxygen interaction affords polymers with high degree of backbone planarity and film ordering. When integrated into polymer solar cells, the polymers show a promising power conversion efficiency approaching 10%.
authors.affiliation: Department of Materials Science and Engineering and The Shenzhen Key Laboratory for Printed Organic Electronics, South University of Science and Technology of China, No. 1088, Xueyuan Road, Shenzhen, Guangdong, 518055, China.
authors.forename: Shengbin
authors.initials: S
authors.lastname: Shi
authors.affiliation: Department of Materials Science and Engineering and The Shenzhen Key Laboratory for Printed Organic Electronics, South University of Science and Technology of China, No. 1088, Xueyuan Road, Shenzhen, Guangdong, 518055, China.
authors.forename: Qiaogan
authors.initials: Q
authors.lastname: Liao
authors.affiliation: Department of Materials Science and Engineering and The Shenzhen Key Laboratory for Printed Organic Electronics, South University of Science and Technology of China, No. 1088, Xueyuan Road, Shenzhen, Guangdong, 518055, China.
authors.forename: Yumin
authors.initials: Y
authors.lastname: Tang
authors.affiliation: Department of Materials Science and Engineering and The Shenzhen Key Laboratory for Printed Organic Electronics, South University of Science and Technology of China, No. 1088, Xueyuan Road, Shenzhen, Guangdong, 518055, China.
authors.forename: Han
authors.initials: H
authors.lastname: Guo
authors.affiliation: Department of Materials Science and Engineering and The Shenzhen Key Laboratory for Printed Organic Electronics, South University of Science and Technology of China, No. 1088, Xueyuan Road, Shenzhen, Guangdong, 518055, China.
authors.forename: Xin
authors.initials: X
authors.lastname: Zhou
authors.affiliation: Department of Materials Science and Engineering and The Shenzhen Key Laboratory for Printed Organic Electronics, South University of Science and Technology of China, No. 1088, Xueyuan Road, Shenzhen, Guangdong, 518055, China.
authors.forename: Yulun
authors.initials: Y
authors.lastname: Wang
authors.affiliation: Department of Materials Science and Engineering and The Shenzhen Key Laboratory for Printed Organic Electronics, South University of Science and Technology of China, No. 1088, Xueyuan Road, Shenzhen, Guangdong, 518055, China.
authors.forename: Tingbin
authors.initials: T
authors.lastname: Yang
authors.affiliation: Department of Materials Science and Engineering and The Shenzhen Key Laboratory for Printed Organic Electronics, South University of Science and Technology of China, No. 1088, Xueyuan Road, Shenzhen, Guangdong, 518055, China.
authors.forename: Yongye
authors.initials: Y
authors.lastname: Liang
authors.affiliation: Department of Materials Science and Engineering and The Shenzhen Key Laboratory for Printed Organic Electronics, South University of Science and Technology of China, No. 1088, Xueyuan Road, Shenzhen, Guangdong, 518055, China.
authors.forename: Xing
authors.initials: X
authors.lastname: Cheng
authors.affiliation: Department of Physics and Astronomy, Shanghai Jiaotong University, Shanghai, 200240, China.|Materials Sciences Division, Lawrence Berkeley National Lab, Berkeley, CA, 94720, USA.
authors.forename: Feng
authors.initials: F
authors.lastname: Liu
authors.affiliation: Department of Materials Science and Engineering and The Shenzhen Key Laboratory for Printed Organic Electronics, South University of Science and Technology of China, No. 1088, Xueyuan Road, Shenzhen, Guangdong, 518055, China.
authors.forename: Xugang
authors.initials: X
authors.lastname: Guo
keywords: film morphology; organic electronics; polymer semiconductors; polymer solar cells; sulfur-oxygen interactions