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We have synthesized novel copolymers P1-P3 comprising fluorene units alternating with cyclopentadithiophene fragments modified at the bridge positions with cyanovinyl or imine groups. Optoelectronic properties of the polymers were investigated in solution and in solid films. A potential of using these materials in organic electronics was considered.

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Organic semiconductors and electronic devices based on these materials continue attracting great interest due to their excellent and unique optoelectronic properties as well as the advantageous possibilities of realizing flexible, light-weight, low-cost, and transparent optoelectronic devices fabricated on ultra-thin and solution-processible active layers. However, their poor electronic performance and unstable operation under ambient conditions limit their application in consumer electronics. This paper presents a brief introduction to doping of organic semiconductors and organic field-effect transistors. The description of the issues regarding charge carrier transport and other optoelectronic properties of organic semiconductors is also provided. The doping agents and methods commonly applied for organic semiconductors along with their fundamental mechanisms are introduced.