Synthesis and Characterization of a Poly(1,3-dithienylisothianaphthene) Derivative for Bulk Heterojunction Photovoltaic Cells
摘要:
The synthesis of a poly(1,3-dithienylisothianaphthene) (PDTITN) derivative obtained via oxidative polymerization of 5,6-dichloro-1,2-bis(3'-dodecylthienyl)isothianaphthene is described. PDTITN exhibits a band gap of 1.80-1.85 eV. The redox properties of PDTITN were characterized using cyclic voltammetry and spectroelectrochemisty. Photoexcitation of PDTITN results in photoluminescence (PL) in the near-IR region and the formation of a triplet state. In the presence of a methanofullerene (PCBM) as an electron acceptor, PL and triplet formation of PDTITN are quenched. In photovoltaic devices using blends of the polymer with PCBM, the observed incident-photon-to-collected-electron efficiency (IPCE) up to 24% at 400 nm and the 3 orders of magnitude increase of short circuit current as compared to the polymer alone prove the photoactivity of the PDTITN/PCBM blend in the device.
A series of X-shaped 5,5′-bis(phenylethynyl)-2,2′-bithiophene-based bolaamphiphiles bearing two long lateral alkyl chains and two terminal glycerol groups has been synthesized by using Kumada and Sonogashira coupling reactions as key steps. The thermotropic liquid crystalline behavior of these compounds was investigated by POM, DSC and X-ray scattering. With elongation of the lateral alkyl chains two
以熊田和Sonogashira偶联反应为关键步骤,合成了一系列带有两个X型5,5'-双(苯基乙炔基)-2,2'-联噻吩基的带有两个长侧链烷基和两个末端甘油基的Balaamphiphils。通过POM,DSC和X射线散射研究了这些化合物的热致液晶行为。与侧向烷基链两种不同液晶相的具有蜂窝结构,柱的伸长六角Δ/ p 6毫米,由(有缺陷的)形成三角形的蜂窝单元,和Col SQU / p 4毫米对于这些化合物,观察到带有方格的样品。UV和PL测量表明荧光特性使其成为潜在的候选荧光传感器设备。