Rapid and efficient exciton diffusion in porphyrin thin films permits excited states to migrate from the point of photogeneration to the donor-acceptor interface. Thus it is important to measure the exciton transport phenomenon efficiently on the surface of thin films of porphyrins when irradiated. In our research we use Monte Carlo eDiffusion Simulations to measure exciton diffusion length, relative quenching efficiency, exciton diffusion Coefficient. One of the very important aspects is to understand the relationship between the structure/molecular orientation of the porphyrin material when annealed and see how this affects the distance over which the exciton can migrate before it dies. We have studied the singlet exciton diffusion properties of solution-cast thin films of carboalkoxyphenylporphyrins for use as sensitizers for organic bulk heterojunction solar cells. We present the effects of the peripheral porphyrin substituents methods of processing the films and molecular orientation on the exciton dynamics. We also discuss how extending singlet exciton diffusion lengths past the absorption depth may ultimately eliminate the requirement of nanostructured donor-acceptor interfaces in porphyrin-based solar cell devices.<br/> <br/>

Monitoring exciton diffusion transport in long alkyl chain porphyrin films for photovoltaics application

251st National Meeting (2016)

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