Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV18)
Publication date: 21st February 2018
Asymmetric diketopyrrolopyrrole-based (DPP) polymers have appeared as an interesting alternative to replace symmetric DPP polymers as donor material in polymer solar cells due to better fine-tuning of their bandgap and energy levels combined with enhanced solubility in non-chlorinated solvents. Asymmetry in the backbone of these polymers is introduced via co-polymerization of an asymmetric DPP monomer of structure A-DPP-B for which A and B represent different aromatic flanking units around the central DPP core and a π-conjugated monomer (X). Different electron-rich segments (A-X-A, B-X-B and/or A-X-B) between the DPP units can be formed during the commonly used one-pot polymerization reaction resulting in random polymer structures. Although the random structure of these polymers is often mentioned in literature, its effect on the physical properties and photovoltaic performance of these polymers has not yet been investigated. In this study a new asymmetric thiophene/pyridine-based DPP polymer is synthesized and its structure investigated by model test reactions and 1H-NMR spectroscopy. Physical properties and photovoltaic performance in bulk heterojunction (BHJ) devices with [70]-PCBM as the electron acceptor are compared to an intentionally designed regioregular asymmetric DPP polymer (-A-X-A-DPP-B-X-B-). Both polymers have the same bandgap (1.48 eV) and energy levels in thin film which is reflected in an equal open-circuit voltage (Voc = 0.85 V) in polymer solar cells. The regioregular asymmetric DPP polymer shows a better performance in photovoltaic devices related to its higher short-circuit current when compared with its random analogue. Further research will address the reason for this difference.
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