Department of Chemistry, The University of Western Ontario, London, Ontario, N6A 5B7, Canada.
J Phys Chem B. 2009 Dec 3;113(48):15715-23. doi: 10.1021/jp904428p.
Electrochemical and photoelectrochemical properties were studied of a series of donor-acceptor materials based on polythiophene modified with silole moieties. The materials were prepared by electrochemical anodic polymerization of 2,5-bis([2,2'-bithiophen]-5-yl)-1,1-dimethyl-3,4-diphenylsilole and 2,5-bis([2,2'-terthiophen]-5-yl)-1,1-dimethyl-3,4-diphenylsilole, as well as copolymerization of these monomers with 2,2'-bithiophene. Photocurrent measurements showed that introduction of silole resulted in a considerable enhancement of the photovoltaic properties of silole-containing materials and especially the fill factor. However, as demonstrated by Mott-Schottky measurements, electropolymerized silole-containing materials showed a substantial degree of disorder and high density of states in the midgap, which negatively affected their photovoltaic properties. Atomic force microscopy (AFM) and phase imaging revealed the presence of phase segregation and heterogeneity of the silole-containing materials. Interestingly, introduction of siloles suppressed the cathodic (n-type) doping typical for polythiophenes. This work demonstrates that siloles show great promise as electron-acceptor groups for all-organic solar cells; however, further work is required to optimize the properties and performance of poly(thienylsilole)-based materials.
电化学和光电化学性质研究了一系列的供体-受体材料基于聚噻吩修饰硅氧烷部分。材料是通过电化学阳极聚合的 2,5-双([2,2'-联噻吩]-5-基)-1,1-二甲基-3,4-二苯基硅氧烷和 2,5-双([2,2'-三噻吩]-5-基)-1,1-二甲基-3,4-二苯基硅氧烷，以及这些单体与 2,2'-联噻吩的共聚。光电流测量表明，硅氧烷的引入导致含硅氧烷材料的光伏性能有了相当大的提高，特别是填充因子。然而，正如 Mott-Schottky 测量所表明的，电聚合的含硅氧烷材料表现出相当程度的无序和高的中间隙态密度，这对其光伏性能产生了负面影响。原子力显微镜（AFM）和相成像揭示了存在的相分离和异质性的含硅氧烷材料。有趣的是，硅氧烷的引入抑制了典型的聚噻吩的阴极（n 型）掺杂。这项工作表明，硅氧烷作为全有机太阳能电池的电子受体基团具有很大的应用前景；然而，需要进一步的工作来优化聚（噻吩基硅氧烷）基材料的性能和性能。
