Journal article
Morphology change and improved efficiency in organic photovoltaics via hexa-peri-hexabenzocoronene templates
HH Dam, K Sun, E Hanssen, JM White, T Marszalek, W Pisula, J Czolk, J Ludwig, A Colsmann, M Pfaff, D Gerthsen, WWH Wong, DJ Jones
ACS Applied Materials and Interfaces | AMER CHEMICAL SOC | Published : 2014
DOI: 10.1021/am5015666
Abstract
The morphology of the active layer in organic photovoltaics (OPVs) is of crucial importance as it greatly influences charge generation and transport. A templating interlayer between the electrode and the active layer can change active layer morphology and influence the domain orientation. A series of amphiphilic interface modifiers (IMs) combining a hydrophilic polyethylene-glycol (PEG) oligomer and a hydrophobic hexabenzocoronene (HBC) were designed to be soluble in PEDOT:PSS solutions, and surface accumulate on drying. These IMs are able to self-assemble in solution. When IMs are deposited on top of a poly(3,4-ethylenedioxythiophene) poly(styrenesulfonate) (PEDOT:PSS) film, they induce a m..
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Funding Acknowledgements
The authors are grateful to Scott Watkins and Thomas Gengenbach from the Commonwealth Science and Industrial Research Organisation (CSIRO) for their help on the PESA measurements and contribution in the form of discussions. The authors are also grateful to the Australian Renewable Energy Agency (ARENA) for financial support and to the Australian Synchrotron for providing the GIWAXS beamtime.