Influence of Polymer Aggregation and Liquid Immiscibility on Morphology Tuning by Varying Composition in PffBT4T-2DT/Non-Fullerene Organic Solar Cells.

Autor:	Hamid Z; Department of Chemistry and Centre for Plastic Electronics, Imperial College London, London, W12 0BZ, United Kingdom., Wadsworth A; Department of Chemistry and Centre for Plastic Electronics, Imperial College London, London, W12 0BZ, United Kingdom., Rezasoltani E; Department of Physics and Centre for Plastic Electronics, Imperial College London, London, SW7 2AZ, United Kingdom., Holliday S; Department of Chemistry and Centre for Plastic Electronics, Imperial College London, London, W12 0BZ, United Kingdom., Azzouzi M; Department of Physics and Centre for Plastic Electronics, Imperial College London, London, SW7 2AZ, United Kingdom., Neophytou M; Physical Sciences and Engineering Division, KAUST Solar Center (KSC), King Abdullah University of Science and Technology (KAUST), KSC Thuwal 23955-6900, Saudi Arabia., Guilbert AAY; Department of Physics and Centre for Plastic Electronics, Imperial College London, London, SW7 2AZ, United Kingdom., Dong Y; Department of Chemistry and Centre for Plastic Electronics, Imperial College London, London, W12 0BZ, United Kingdom., Little MS; Department of Chemistry and Centre for Plastic Electronics, Imperial College London, London, W12 0BZ, United Kingdom., Mukherjee S; Material Measurement Laboratory, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA., Herzing AA; Material Measurement Laboratory, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA., Bristow H; Department of Chemistry and Centre for Plastic Electronics, Imperial College London, London, W12 0BZ, United Kingdom., Kline RJ; Material Measurement Laboratory, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA., DeLongchamp DM; Material Measurement Laboratory, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA., Bakulin AA; Department of Chemistry and Centre for Plastic Electronics, Imperial College London, London, W12 0BZ, United Kingdom., Durrant J; Department of Chemistry and Centre for Plastic Electronics, Imperial College London, London, W12 0BZ, United Kingdom., Nelson J; Department of Physics and Centre for Plastic Electronics, Imperial College London, London, SW7 2AZ, United Kingdom., McCulloch I; Department of Chemistry and Centre for Plastic Electronics, Imperial College London, London, W12 0BZ, United Kingdom; Physical Sciences and Engineering Division, KAUST Solar Center (KSC), King Abdullah University of Science and Technology (KAUST), KSC Thuwal 23955-6900, Saudi Arabia.
Jazyk:	angličtina
Zdroj:	Advanced energy materials [Adv Energy Mater] 2020; Vol. 10 (8).
Abstrakt:	The temperature dependent aggregation behavior of PffBT4T polymers used in organic solar cells plays a critical role in the formation of a favorable morphology in fullerene-based devices. However, there has been little investigation into the impact of donor/acceptor ratio on morphology tuning, especially for non-fullerene acceptors (NFAs). Herein, the influence of composition on morphology is reported for blends of PffBT4T-2DT with two NFAs, O-IDTBR and O-IDFBR. The monotectic phase behavior inferred from differential scanning calorimetry provides qualitative insight into the interplay between solid-liquid and liquid-liquid demixing. Transient absorption spectroscopy suggests that geminate recombination dominates charge decay and that the decay rate is insensitive to composition, corroborated by negligible changes in open-circuit voltage. Exciton lifetimes are also insensitive to composition, which is attributed to the signal being dominated by acceptor excitons which are formed and decay in domains of similar size and purity irrespective of composition. A hierarchical morphology is observed, where the composition dependence of size scales and scattering intensity from resonant soft X-ray scattering (R-SoXS) is dominated by variations in volume fractions of polymer/polymer rich domains. Results suggest an optimal morphology where polymer crystallite size and connectivity are balanced, ensuring a high probability of hole extraction via such domains.
Databáze:	MEDLINE
Externí odkaz:	Plný text