Publication date: 31st July 2014
The development of new organic materials with applications in electro-optical devices is one of the most active fields of research in the last years. It is expected that use of polymers will introduce a significantly advance in the construction and application of devices for energy generation, image display, lighting systems and others. At present two major approaches are used to deposit optoelectronic organic materials layers: thermal evaporation and solution processing. Although thermal evaporation through the use of a mask can produce well-ordered patterned films, the throughput is slow and involves expensive vacuum systems. Also, thermal evaporation demands materials with sublimation capability and excellent thermal stability, properties that are not easy to obtain in polymers. A promising technique for conducting polymer film production is the electropolymerization of electroactive monomers. The polymer films made through this way is an alternative and attractive film formation method to build highly efficient optoelectronic devices. In this presentation the generation of porphyrin/porphyrin and porphyrin/C60 heterojunctions over indium tin oxide electrodes by successive electropolymerization steps is described. Functionalized C60 buckminsterfullerene holding polymerizable residues and porphyrins containing carbazol and phenylamino moieties are able to form electrodeposited layers by cyclic voltammetry. Photoinduced electron transfer between Zn(II), free base porphyrins and C60 films were analyzed by both, light modulated surface photovoltage spectroscopy and laser induced transient photovoltage. The results showed that the electrochemical generated polymeric heterojunctions are able to produce photoinduced charge separated states, which could present a potential application in the design and construction of organic optoelectronic devices. Furthermore, the photoactive organic films were successfully formed on the top of ITO electrodes modified with poly 3,4-ethylenedioxythiophene layer generated by electropolymerization. The presence of this hole transport polymer dramatically alters the formation and diffusion process of the photocarriers generated by excitation of the porphyrin films. The devices formed by combining the here reported porphyrin conducting electropolymers (as light harvesting, electron donor and hole-transport layers) and fullerenes (as electron acceptor and electron-transport) could be used in the development of new solar energy technologies. On the other hand, the photoinduced charge separation processes in CdSe QDs deposited on electropolymer films containing C60 as electron acceptor group will be showed. This organic polymer is obtained from a specifically designed electroactive monomer formed by 3,4-ethylenedioxythiophene holding C60 moieties. We demonstrated the capacity of this system for the generation of photoinduced charge separation states.
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