A pyrrolopyridazinedione-based copolymer for fullerene-free organic solar cells

Astrid Caroline Knall*, Samuel Rabensteiner, Sebastian Franz Hoefler, Matiss Reinfelds, Mathias Hobisch, Heike M.A. Ehmann, Nadiia Pastukhova, Egon Pavlica, Gvido Bratina, Ilie Hanzu, Shuguang Wen, Renqiang Yang, Gregor Trimmel, Thomas Rath

*Korrespondierende/r Autor/in für diese Arbeit

Publikation: Beitrag in einer FachzeitschriftArtikel

Abstract

The recent success of non-fullerene acceptors in organic photovoltaics also entails a change in the requirements to the polymer donor in terms of optical and morphological properties leading to a demand for novel conjugated polymers. Herein, we report on the synthesis of a 1,4-bis-(thiophene-2-yl)-pyrrolopyridazinedione based copolymer with 2-ethylhexyl substituents on the pyrrolopyridazinedione moiety. A 2D conjugated benzodithiophene (BDT) was chosen as comonomer. The resulting copolymer T-EHPPD-T-EHBDT showed a molecular weight of 10.2 kDa, an optical band gap of 1.79 eV, a hole mobility of 1.8 × 10-4 cm2 V-1 s-1 and a preferred face-on orientation with regard to the substrate. The comparably wide band gap as well as the determined energy levels (HOMO: -5.47 eV, LUMO: -3.68 eV) match well with the narrow band gap non-fullerene acceptor ITIC-F, which was used as the acceptor phase in the bulk heterojunction absorber layers in the investigated solar cells. The solar cells, prepared in inverted architecture, revealed power conversion efficiencies up to 7.4% using a donor:acceptor ratio of 1 : 1 in the absorber layer. This journal is

Originalspracheenglisch
Seiten (von - bis)1001-1009
Seitenumfang9
FachzeitschriftNew Journal of Chemistry
Jahrgang45
Ausgabenummer2
DOIs
PublikationsstatusVeröffentlicht - 14 Jan 2021

ASJC Scopus subject areas

  • !!Catalysis
  • !!Chemistry(all)
  • !!Materials Chemistry

Fields of Expertise

  • Advanced Materials Science

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