Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV18)
DOI: https://doi.org/10.29363/nanoge.hopv.2018.124
Publication date: 21st February 2018
Semiconductor polymers have attracted considerable attention in the past few decades for their feasibility in low cost, flexible, roll-to-roll compatible electronic organic devices. To date, most of the conjugated polymers have been used as donors blended with fullerenes, which act as acceptors. However, few examples exist in the literature where polymers have been used as efficient electron acceptors.
Herein, we present a transient absorption spectroscopy (TAS) study of two different cross-conjugated polymers based on Tyrian Purple that can be used both as electron acceptor (blended with P3HT) and donor (blended with PCBM). These two polymers have been demonstrated to generate free charges when deposited either with P3HT or with PCBM. Moreover, similar P3HT cation TAS signal amplitudes to P3HT:PCBM reference were obtained when blending these polymers with P3HT. Therefore, a similar amount of P3HT cations were generated blending P3HT with either these cross-conjugated polymers or with PCBM. In addition, transient species obtained showed long lifetimes when the cross-conjugated polymer were used as acceptor and donor. The fitting to these decays to a power law equation also showed than in both cases the charges were localised in very deep traps, which justify the long lifetimes. This is in accordance with the reported calculated structures for the HOMO and LUMO, where a strong HOMO localisation was shown. All these characteristics provides a promising direction for the development of cross-conjugated polymers for potential use in photovoltaic devices.
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