TY - JOUR
T1 - A pyrrolopyridazinedione-based copolymer for fullerene-free organic solar cells
AU - Knall, Astrid Caroline
AU - Rabensteiner, Samuel
AU - Hoefler, Sebastian Franz
AU - Reinfelds, Matiss
AU - Hobisch, Mathias
AU - Ehmann, Heike M.A.
AU - Pastukhova, Nadiia
AU - Pavlica, Egon
AU - Bratina, Gvido
AU - Hanzu, Ilie
AU - Wen, Shuguang
AU - Yang, Renqiang
AU - Trimmel, Gregor
AU - Rath, Thomas
N1 - Publisher Copyright:
© 2021 The Royal Society of Chemistry and the Centre National de la Recherche Scientifique.
PY - 2021/1/14
Y1 - 2021/1/14
N2 - 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
AB - 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
UR - http://www.scopus.com/inward/record.url?scp=85099604548&partnerID=8YFLogxK
U2 - 10.1039/d0nj04573j
DO - 10.1039/d0nj04573j
M3 - Article
AN - SCOPUS:85099604548
SN - 0398-9836
VL - 45
SP - 1001
EP - 1009
JO - New Journal of Chemistry
JF - New Journal of Chemistry
IS - 2
ER -