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Title: Conjugated ionic (co)polythiophene-based cathode interlayers for bulk heterojunction organic solar cells
Authors: GOVAERTS, Sanne 
KESTERS, Jurgen 
Defour, Maxime
Van Mele, Bruno
PENXTEN, Huguette 
RENNER, Frank 
Lutsen, Laurence
MAES, Wouter 
Issue Date: 2017
Source: EUROPEAN POLYMER JOURNAL, 97, p. 49-56
Abstract: The incorporation of conjugated polyelectrolytes as cathode interlayers in organic photovoltaics has been proven to be an effective way to boost the device efficiency. Nevertheless, more detailed investigations of the structure property relationships of these interlayer materials, in particular related to the film deposition behavior, can provide further insights into their mode of action. With this aim, a series of ionic (co)polythiophenes is successfully synthesized via Kumada catalyst-transfer condensation polymerization and subsequent introduction of ionic moieties on the polymer side chains. Both the topology (i.e. homopolymers, random and block copolymers) and the amount of ionic groups are systematically varied. The polymers are fully characterized and then applied as cathode interlayers in polymer solar cells based on PCDTBT:PC71BM, affording an average efficiency increase of similar to 15%. The structural screening on one hand indicates that the efficiency gain is a rather general phenomenon for this material class. On the other hand, the best photovoltaic responses are observed for the conjugated polyelectrolytes with a higher triethylene glycol side chain ratio and the block copolymer structure performs slightly better as compared to the random copolymer with the same (50/50) monomer ratio. Based on these findings, the field can move on to a more rational development of novel interfacial materials and thereby push the device efficiency even further.
Notes: [Govaerts, Sanne; Kesters, Jurgen; Penxten, Huguette; Vanderzande, Dirk; Maes, Wouter] UHasselt Hassell Univ, Inst Mat Res IMO, DSOS, B-3590 Diepenbeek, Belgium. [Defour, Maxime; Van Mele, Bruno] Vrije Univ Brussel, Phys Chem & Polymer Sci FYSC, Pleinlaan 2, B-1050 Brussels, Belgium. [Neupane, Shova; Renner, Frank Uwe] UHasselt Hasselt Univ, Inst Mat Res IMO, Energy Mat & Interfaces EMInt, Wetenschapspk 1, B-3590 Diepenbeek, Belgium. [Renner, Frank Uwe; Lutsen, Laurence; Vanderzande, Dirk; Maes, Wouter] IMEC, IMOMEC Div, Wetenschapspk 1, B-3590 Diepenbeek, Belgium.
Keywords: Conjugated polyelectrolytes; Polymer solar cells; Interfacial materials; Topology; Structure-property relationships;Conjugated polyelectrolytes; Polymer solar cells; Interfacial materials; Topology; Structure-property relationships
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ISSN: 0014-3057
e-ISSN: 1873-1945
DOI: 10.1016/j.eurpolymj.2017.09.043
ISI #: 000419415800005
Category: A1
Type: Journal Contribution
Validations: ecoom 2019
Appears in Collections:Research publications

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