Vibrational and local dynamics as a tool to better understand the microstructure-charge generation relationship in organic photovoltaics
In organic photovoltaic devices, the photocurrent generation results from the dissociation of excitons into free charges that happens at the interface between a polymer donor material and a fullerene acceptor material. We propose to study the relationship between molecular packing and local dynamics close to a donor acceptor interface on the efficiency and rate of charge separation. There is some indirect experimental evidence for a relationship. But this is hard to probe experimentally because of the difficulties in probing structure in small domains and in unambiguously identifying excited state species formed following photoexcitation. However the different phases of material will generally express different vibrational modes and these modes are moreover modulated under excitation. We propose to probe the vibrational and local dynamic behaviour of the different phases of material, and later on their behaviour under photoexcitation, combining inelastic and quasi-elastic neutron scattering in order to determine the relationship between presence of different phases and the efficiency of charge pair separation.
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GUILBERT Anne; NELSON Jenny and ZBIRI Mohamed. (2015). Vibrational and local dynamics as a tool to better understand the microstructure-charge generation relationship in organic photovoltaics. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.7-04-139
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