Journal article
Liquid Crystallinity as a Self-Assembly Motif for High-Efficiency, Solution-Processed, Solid-State Singlet Fission Materials
S Masoomi-Godarzi, M Liu, Y Tachibana, VD Mitchell, L Goerigk, KP Ghiggino, TA Smith, DJ Jones
Advanced Energy Materials | WILEY-V C H VERLAG GMBH | Published : 2019
Abstract
Solution and solution-deposited thin films of the discotic liquid crystalline electron acceptor–donor–acceptor (A-D-A) p-type organic semiconductor FHBC(TDPP)2, synthesized by coupling thienyl substituted diketopyrrolopyrrole (TDPP) onto a fluorenyl substituted hexa-peri-hexabenzocoronene (FHBC) core, are examined by ultrafast and nanosecond transient absorption spectroscopy, and time-resolved photoluminescence studies to examine their ability to support singlet fission (SF). Grazing incidence wide-angle X-ray (GIWAX) studies indicate that as-cast thin films of FHBC(TDPP)2 are “amorphous,” while hexagonal packed discotic liquid crystalline films evolve during thermal annealing. SF in as-cast..
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Funding Acknowledgements
This work was made possible by support from the Australian Renewable Energy Agency which funds the project grants within the Australian Centre for Advanced Photovoltaics. Responsibility for the views, information, or advice expressed herein is not accepted by the Australian Government. L.G. would also like to acknowledge generous allocations of computational resources from the University of Melbourne and the National Computational Infrastructure Facility within the National Computational Merit Allocation Scheme. The authors acknowledge the SAXS/WAXS beamline at the Australian Synchrotron. This work was partly supported by the JST PRESTO program (Photoenergy Conversion Systems and Materials for the Next Generation Solar Cells), Japan. The authors thank Dr. Wallace W. H. Wong for the initial sample of FHBC(TDPP)<INF>2</INF> used in preliminary studies.