Charge Transfer in Conjugated Polymers

In this section we review theoretical and experimental results important for understanding the photophysics of polymer solar cells. We examine the states that are involved in the processes of photoinduced charge generation, and present a theoretical framework that describes the separation and recombination of charge-transfer states. Finally, we review the mechanisms for charge formation that operate in a fdm of a single conjugated polymer and the additional mechanisms, relevant to solar cell devices, that occur in binary donor acceptor blends. 

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This photoinduced charge transfer between conjugated polymers as donor and fullerenes as acceptor takes place within less than 50 fs [54]. Since all competing processes like photoluminescence ( ns) and back transfer and thus recombination of the charge ( xs) [8-10] take place on a much larger timescale, the charge separation process is highly efficient and metastable. These possible pathways for the decay of the system after excitation are displayed in Fig. 5 for comparison. 

Charge Transfer and Charge Separation in Conjugated Polymer... 

Charge Transfer and Charge Separation in Conjugated Polymer Solar Cells 535 13.2.1 Excitons as the Primary Photoexcitations... 

From the above-mentioned experimental observations, it is rather confusing to compare the doping results from different sample preparation methods and from different dopants. It seems that different dopants act in different ways for the doping of SP/IP composite. This confusion calls for more research on the detail of charge transfer from conjugated polymer to dopant, especially at the presence of insulating polymer. 

We present our recent research of excitation transfer and charge separation in conjugated polymers. We continue by summarizing our studies of ultrafast photoinduced processes in dye-sensitized nanocrystalline large band-gap semiconductor films - a key part of the GrStzel solar cell. Finally, our recent studies of energy transfer in transition metal supramolecular complexes, a kind of artificial antenna, are presented. 

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