Role of Crystallization in the Morphology of Polymer:Non-fullerene Acceptor Bulk Heterojunctions

ACS Applied Materials & Interfaces
Kathryn A O'HaraMichael L Chabinyc

Abstract

Many high efficiency organic photovoltaics use fullerene-based acceptors despite their high production cost, weak optical absorption in the visible range, and limited synthetic variability of electronic and optical properties. To circumvent this deficiency, non-fullerene small-molecule acceptors have been developed that have good synthetic flexibility, allowing for precise tuning of optoelectronic properties, leading to enhanced absorption of the solar spectrum and increased open-circuit voltages (VOC). We examined the detailed morphology of bulk heterojunctions of poly(3-hexylthiophene) and the small-molecule acceptor HPI-BT to reveal structural changes that lead to improvements in the fill factor of solar cells upon thermal annealing. The kinetics of the phase transformation process of HPI-BT during thermal annealing were investigated through in situ grazing incidence wide-angle X-ray scattering studies, atomic force microscopy, and transmission electron microscopy. The HPI-BT acceptor crystallizes during film formation to form micron-sized domains embedded within the film center and a donor rich capping layer at the cathode interface reducing efficient charge extraction. Thermal annealing changes the surface composition and ...Continue Reading

References

Dec 15, 1994·Physical Review. B, Condensed Matter·B KraabelA J Heeger
Apr 14, 2005·Nano Letters·Xiaoniu YangRené A J Janssen
Jul 3, 2009·Accounts of Chemical Research·Jeffrey PeetGuillermo C Bazan
Dec 12, 2012·Advanced Materials·René A J Janssen, Jenny Nelson
Jul 19, 2013·Journal of the American Chemical Society·Sandra KouijzerRené A J Janssen
Apr 3, 2014·Annual Review of Physical Chemistry·Neil D Treat, Michael L Chabinyc
Sep 6, 2012·The Journal of Physical Chemistry Letters·Sridhar RajaramK S Narayan
Jun 10, 2016·Nature Communications·Sarah HollidayIain McCulloch
Jan 14, 2017·Journal of the American Chemical Society·Liyan YangJianhui Hou

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Citations

Feb 8, 2019·Reports on Progress in Physics·Robert S GurneyTao Wang

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