title: Synthesis and properties of copolymers composed of arylenevinylene and phenothiazine for organic solar cells.
abstract: A series of new organic semiconducting copolymers composed of {(2E,2'E)-3,3'-[2,5-bis(octyloxy)-1,4-phenylene]-bis[2-(thiophen-2-yl)acrylonitrile]}(OPTAN) and 10(2'-ethylhexylphenothiazine) (PTZ) monomers, (the copolymers are hereafter referred to as poly(OPTAN-co-PTZ)s), were synthesized by using Suzuki coupling polymerization in which the monomer ratios were controlled. An increase in the OPTAN content shifted the peak and onset absorption of the copolymers to the longer wavelength regions, which resulted in a decrease in the band gap energy. The maximum UV absorption of the polymer films was in the range 523-540 nm and the optical band gap energies were in the range 1.90-1.87 eV. Energy levels of the highest occupied molecular orbital (HOMO) of the polymers were determined by cyclic voltammetry (CV). The HOMO energy level of the copolymers was between -5.07 and -5.12 eV. Photovoltaic devices were fabricated by using the copolymers as the p-type donor and C60-PCBM or C70-PCBM as the electron acceptors. The device with poly(50OPTAN-alt-50PTZ) and C70-PCBM showed the best performance among the fabricated devices; the open circuit voltage, short circuit current, fill factor, and maximum power conversion efficiency of this device were 0.79 V, 5.25 mA/cm2, 0.30, and 1.25%, respectively.
authors: Department of Chemistry, and Chemistry Institute for Functional Materials, Pusan National University, Busan 609-735, Republic of Korea.
authors: Ji-Hoon
authors: JH
authors: Kim
authors: Dongbo
authors: D
authors: Mi
authors: In-Nam
authors: IN
authors: Kang
authors: Won Suk
authors: WS
authors: Shin
authors: Sung Cheol
authors: SC
authors: Yoon
authors: Sang-Jin
authors: SJ
authors: Moon
authors: Changjin
authors: C
authors: Lee
authors: Jin-Kyun
authors: JK
authors: Lee
authors: Do-Hoon
authors: DH
authors: Hwang