title: Synthesis of Phenanthro[1,10,9,8-cdefg]carbazole-Based Conjugated Polymers for Green-Selective Organic Photodiodes.
abstract: A push-pull-type donor copolymer, named PP-TPD, was synthesized with the Suzuki coupling reaction using 6H-phenanthro[1,10,9,8-cdefg]carbazole (PCZ) as the donor unit and 1,3-bis(5-bromothiophen-2-yl)-5-octyl-4H-thieno[3,4-c]pyrrole-4,6(5H)-dione (TPD) as the acceptor unit. The synthesized PP-TPD was systematically investigated in terms of crystallinity and thermal, electrical, electrochemical, and optical properties. PP-TPD revealed green-selective absorption with a narrow full width at half-maximum of 138 nm. Green-selective organic photodiodes (OPDs) were constructed using PP-TPD as the green-absorbing donor and ZnO as the nonabsorbing acceptor material. The fabricated OPDs exhibited an extremely low dark current of 0.68 nA/cm2at -5 V and a high detectivity above 1012Jones at 550 nm. Moreover, they showed a sufficiently high 3-dB frequency and a linear dynamic range, similar to those of ideal-operating OPDs. The origin and physics background of the observed low dark current and high detectivity are discussed in detail.
authors.affiliation: Department of Chemistry and Research Institute for Green Energy Convergence Technology (RIGET), Gyeongsang National University , Jinju 660-701, Korea.
authors.forename: Min Jae
authors.initials: MJ
authors.lastname: Sung
authors.affiliation: School of Chemical Engineering and Material Science, Chung-Ang University , Seoul 156-756, Korea.
authors.forename: Seongwon
authors.initials: S
authors.lastname: Yoon
authors.affiliation: School of Materials Science & Engineering and ERI, Gyeongsang National University , Jinju 660-701, Korea.
authors.forename: Soon-Ki
authors.initials: SK
authors.lastname: Kwon
authors.affiliation: Department of Chemistry and Research Institute for Green Energy Convergence Technology (RIGET), Gyeongsang National University , Jinju 660-701, Korea.
authors.forename: Yun-Hi
authors.initials: YH
authors.lastname: Kim
authors.affiliation: School of Chemical Engineering and Material Science, Chung-Ang University , Seoul 156-756, Korea.
authors.forename: Dae Sung
authors.initials: DS
authors.lastname: Chung
keywords: color-selective; low-dark current; organic photodiodes; phenanthrocarbazole; thienopyrroledione