Toward High Efficiency Water Processed Organic Photovoltaics: Controlling the Nanoparticle Morphology with Surface Energies

Here efficient organic photovoltaic devices fabricated from water‐based colloidal dispersions with donor:acceptor composite nanoparticles achieving up to 9.98% power conversion efficiency (PCE) are reported. This high efficiency for water processed organic solar cells is attributed to morphology con...

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Bibliographic Details
Published in:Advanced energy materials 2023-07, Vol.13 (26), p.n/a
Main Authors: Laval, Hugo, Holmes, Alexandre, Marcus, Matthew A., Watts, Benjamin, Bonfante, Gwenaël, Schmutz, Marc, Deniau, Elise, Szymanski, Robin, Lartigau‐Dagron, Christine, Xu, Xiaoxue, Cairney, Julie M., Hirakawa, Kazuhiko, Awai, Fumiyasu, Kubo, Takaya, Wantz, Guillaume, Bousquet, Antoine, Holmes, Natalie P., Chambon, Sylvain
Format: Article
Language:English
Subjects:
Acceptor materials
colloidal dispersion
Energy conversion efficiency
Heat treatment
Inks
Interfacial energy
Morphology
Nanoparticles
organic photovoltaics
Phase separation
Photovoltaic cells
Physics
scanning transmission X-ray microscopy
Solar cells
SOLAR ENERGY
Solvents
Surface energy
Synchrotrons
water-based process
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Summary:Here efficient organic photovoltaic devices fabricated from water‐based colloidal dispersions with donor:acceptor composite nanoparticles achieving up to 9.98% power conversion efficiency (PCE) are reported. This high efficiency for water processed organic solar cells is attributed to morphology control by surface energy matching between the donor and the acceptor materials. Indeed, due to a low interfacial energy between donor and the acceptor, no large phase separation occurs during the nanoparticle formation process as well as upon thermal annealing. Indeed, synchrotron‐based scanning transmission X‐ray microscopy reveals that the internal morphology of composite nanoparticles is intermixed as well as the active layer morphology after thermal treatment. The PCE of this system reaches 85% that of devices prepared from chlorinated solvent. The gap between water‐based inks and organic solvent‐based inks gets narrower, which is promising for the development of eco‐friendly processing and fabrication of organic photovoltaics. This article describes the fabrication of organic photovoltaic devices from water‐based nanoparticle dispersions. By careful control of the surface energies, optimal nanoparticle morphology is achieved, leading to devices with up to 9.98% power conversion efficiency. This study opens the route for environmentally friendly processes for organic photovoltaics.
ISSN:1614-6832
1614-6840
DOI:10.1002/aenm.202300249