Proceedings of Online International Conference on Hybrid and Organic Photovoltaics (OnlineHOPV20)
Publication date: 22nd May 2020
OPV active layers possess a complex morphology with intermixed donor:acceptor interface in addition to purer crystalline domains. These more crystalline domains may usually have a lower LUMO and a higher HOMO level compared to the amorphous material. This difference in the energy levels may represent an energy sink that aids charge separation and decrease bimolecular recombination.1
Herein, a transient absorption spectroscopy (TAS) study of a novel polymer, XIND, is presented. One of the particularities is that, given the position its energy levels, can be act either as electron donor or electron acceptor. This ambipolar behaviour makes him the perfect candidate to explore the energy sink hypothesis. Moreover, spectral evolution and changes in decay dynamics over the microsecond time scale revealed the presence of two different spectral shapes, one of them centered at 1400 nm, and present when the XIND polymer was acting as both, electron donor and acceptor. This 1400 nm centered band was very similar in shape to pristine XIND polaron spectrum and was, therefore, assigned to the XIND polarons localised in the more crystalline XIND regions. Furthermore, the polymer dual character enabled the identification of interfacial negative and positive polaron absorbing around 1600 and 1100 nm, respectively, demonstrating their completely different signatures. In addition, it is shown that both kind of polarons, interfacial and bulk, were present in the studied samples, however, photogenerated polarons did transfer from the interface into the bulk after charge separation process.
These findings support the energy sink hypothesis, offer a way to maximise morphology relationships to enhance charge generation and suppress recombination and provides an additional consideration for future spectral assignments.
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