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Revisiting Solvent Additives for the Fabrication of Polymer:Fullerene Solar Cells: Exploring a Series of Benzaldehydes

Sprau, Christian 1,2; Kattenbusch, Jens 1; Li, Yonghe 2,3; Müller, Erich 2,3; Gerthsen, Dagmar 2,3; Berger, Rüdiger; Michels, Jasper J.; Colsmann, Alexander 1,2
1 Lichttechnisches Institut (LTI), Karlsruher Institut für Technologie (KIT)
2 Materialwissenschaftliches Zentrum für Energiesysteme (MZE), Karlsruher Institut für Technologie (KIT)
3 Laboratorium für Elektronenmikroskopie (LEM), Karlsruher Institut für Technologie (KIT)


The power conversion efficiencies of organic solar cells delicately depend on the morphology of the light-harvesting bulk heterojunctions (BHJ). Upon deposition from solution, the formation of tailored bicontinuous networks of polymers and fullerenes is often achieved using combinations of solvents and solvent additives. Common wisdom infers that best solar cell performances are achieved when the solvent additives exhibit excellent fullerene solubility. Herein, this concept is revisited based on the investigation of a series of structurally similar, substituted benzaldehydes. It is concluded that the solvent additives do not only have to feature the commonly accepted good fullerene solubility, but must also exhibit lowest polymer solubility to suppress liquid–liquid demixing and hence achieve best solar cell performance. Thus, this study adds an important item to the list of selection criteria of solvent additives toward the production of polymer:fullerene solar cells with optimized power conversion efficiencies. The microscopic picture of the resulting domain configurations within the light-harvesting layers is developed around comprehensive multiscale investigations of the BHJ morphology, using atomic force microscopy, scanning transmission electron microscopy, and nano-infrared microscopy. ... mehr

Verlagsausgabe §
DOI: 10.5445/IR/1000136105
Veröffentlicht am 24.11.2021
DOI: 10.1002/solr.202100238
Zitationen: 4
Web of Science
Zitationen: 4
Zitationen: 4
Cover der Publikation
Zugehörige Institution(en) am KIT Laboratorium für Elektronenmikroskopie (LEM)
Lichttechnisches Institut (LTI)
Materialwissenschaftliches Zentrum für Energiesysteme (MZE)
Universität Karlsruhe (TH) – Zentrale Einrichtungen (Zentrale Einrichtungen)
Publikationstyp Zeitschriftenaufsatz
Publikationsmonat/-jahr 09.2021
Sprache Englisch
Identifikator ISSN: 2367-198X
KITopen-ID: 1000136105
HGF-Programm 38.01.02 (POF IV, LK 01) Materials and Interfaces
Erschienen in Solar RRL
Verlag John Wiley and Sons
Band 5
Heft 9
Seiten Art.-Nr. 2100238
Vorab online veröffentlicht am 30.06.2021
Nachgewiesen in Dimensions
Web of Science
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