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Green Inks for the Fabrication of Organic Solar Cells: A Case Study on PBDTTPD:PC$_{61}$BM Bulk Heterojunctions

Sprau, Christian ORCID iD icon; Cruz, Ana Milena; Bautista, Lorenzo; Molina, Laura; Wagner, Michael; Chochos, Christos L.; Della Pirriera, Mónica; Colsmann, Alexander ORCID iD icon


Nonhalogenated ecofriendly solvents are an important asset to avoid costly safety precautions during the fabrication of organic solar cells by printing. Yet, in the past, the quest for suitable nontoxic solvents has widely used empirical approaches. Herein, a comprehensive solubility study is rolled out embracing Hansen solubility parameters (HSPs), tailoring of binary solvents and rational choices of solvent additives, identifying ecofriendly solvents or solvent combinations for the deposition of poly-benzodithophene-thienopyrroledione (PBDTTPD)/fullerene thin-film blends. A particular challenge is the low polymer solubility even in common halogenated solvents. Following the HSPs, initially, a list of suitable solvent candidates is identified which are tested toward their applicability in solar cell fabrication. Among the shortlisted solvents, significant differences between p-xylene and o-xylene are observed, which can be compensated using solvent additives. The ecofriendly green solvent eucalyptol in combination with benzaldehyde and p-anisaldehyde in a ternary solvent mixture gives rise to decent solar cell performances. Solar cells are produced with power conversion efficiencies matching those conventionally fabricated from state-of-the-art halogenated solvents comprising chlorobenzene and chloronaphthalene. ... mehr

Verlagsausgabe §
DOI: 10.5445/IR/1000137513
Veröffentlicht am 27.09.2021
DOI: 10.1002/aesr.202100043
Zitationen: 6
Zitationen: 7
Cover der Publikation
Zugehörige Institution(en) am KIT Lichttechnisches Institut (LTI)
Materialwissenschaftliches Zentrum für Energiesysteme (MZE)
Publikationstyp Zeitschriftenaufsatz
Publikationsmonat/-jahr 09.2021
Sprache Englisch
Identifikator ISSN: 2699-9412
KITopen-ID: 1000137513
HGF-Programm 38.01.02 (POF IV, LK 01) Materials and Interfaces
Erschienen in Advanced energy & sustainability research
Verlag Wiley-VCH Verlag
Band 2
Heft 9
Seiten Art.-Nr. 2100043
Projektinformation MatHero (EU, FP7, 604603)
Vorab online veröffentlicht am 05.05.2021
Nachgewiesen in Scopus
Globale Ziele für nachhaltige Entwicklung Ziel 7 – Bezahlbare und saubere Energie
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