DOI: https://doi.org/10.29363/nanoge.aohm.2019.014
Publication date: 8th January 2019
In the field of organic photovoltaics, efficiencies beyond 13% have recently been achieved by combining conjugated polymers with small-molecule non-fullerene acceptors (NFAs). Besides remarkable efficiencies, intriguing properties for these NFAs have been reported. Polymer:NFA devices typically show low open circuit voltage (VOC) loss, which is linked to the small energy offset between the excited state of the low bandgap component and the charge transfer state. This might lead to slow charge transfer rates and it must be elucidated why photocurrent generation is still efficient. To understand what differentiates non-fullerenes from fullerenes in terms of the charge generation, we have used ultrafast transient absorption spectroscopy (TAS) on blends containing m-ITIC (NFA) with different conjugated polymers (different driving forces for charge transfer). Both the NFA and the polymers were selectively excited to differentiate hole and electron transfer processes. Moreover, to disentangle the driving force from structural/morphological effects, the ratio in the polymer:NFA blends was varied from optimal to dilute concentrations, and we have worked with bilayers. Varying the thickness of the layers, the direction of irradiation and the excitation wavelength, we could determine the exciton dissociation rates upon electron and hole transfer, and gain insight how those processes are limited by exciton diffusion.
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