Abstract
Polymer:fullerene nanoparticles (NPs) offer two key advantages over bulk heterojunction (BHJ) films for organic photovoltaics (OPVs), water-processability and potentially superior morphological control. Once an optimal active layer morphology is reached, maintaining this morphology at OPV operating temperatures is key to the lifetime of a device. Here we study the morphology of the PDPP-TNT (polyη3,6-dithio-phene-2-yl-2,5-di(2-octyldodecyl)-pyrrolo[3,4-c]pyrrole-1,4-dione-alt-naphthaleneν):PC71BM ([6,6]-phenyl C71 butyric acid methyl ester) NP system and then compare the thermal stability of NP and BHJ films to the common poly(3-hexylthiophene) (P3HT): phenyl C61 butyric acid methyl ester (PC61BM) system. We find that material Tg plays a key role in the superior thermal stability of the PDPP-TNT:PC71BM system; whereas for the P3HT:PC61BM system, domain structure is critical.
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01 June 2017
An Erratum to this paper has been published: https://doi.org/10.1557/mrc.2017.19
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Acknowledgments
The authors thank the University of Newcastle Electron Microscopy and X-ray Unit. Special thanks to Robin Arnold and Samson Dowland at the University of Sydney (Anatomy and Histology, School of Medical Sciences) where TEM measurements were performed. The University of Newcastle and the Australian Renewable Energy Agency (ARENA) are gratefully acknowledged for PhD scholarships (NH). We acknowledge financial support from the Commonwealth of Australia through the Access to Major Research Facilities Program. The A.L.S. is supported by the Director, Office of Science, Office of Basic Energy Sciences, of the U.S. Department of Energy under Contract No. DE-AC02-05CH11231. This work was performed in part at the Materials node (Newcastle) and the Queensland node of the Australian National Fabrication Facility (ANFF), which is a company established under the National Collaborative Research Infrastructure Strategy to provide nano- and microfabrication facilities for Australia’s researchers.
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Holmes, N.P., Vaughan, B., Williams, E.L. et al. Diketopyrrolopyrrole-based polymer:fullerene nanoparticle films with thermally stable morphology for organic photovoltaic applications. MRS Communications 7, 67–73 (2017). https://doi.org/10.1557/mrc.2017.3
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DOI: https://doi.org/10.1557/mrc.2017.3