A pyrrolopyridazinedione-based copolymer for fullerene-free organic solar cells
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.
2021
2021-01-27 02:03:23
1033
non-fullerene solar cells, charge transport, charge mobility, power conversion efficiency
r6
Astrid-Caroline
Knall
70
Samuel
Rabensteiner
70
Sebastian F.
Hoefler
70
Matiss
Reinfelds
70
Mathias
Hobisch
70
Heike M. A.
Ehmann
70
Nadiia
Pastukhova
70
Egon
Pavlica
70
Gvido
Bratina
70
Illie
Hanzu
70
Shuguang
Wen
70
Renqiang
Yang
70
Gregor
Trimmel
70
Thomas
Rath
70
COBISS_ID
3
48862979
DOI
15
10.1039/D0NJ04573J
NUK URN
18
URN:SI:UNG:REP:5TLY9IH1
d0nj04573j.pdf
2805223
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2021-01-27 02:04:50
0
Izvorni URL
2021-01-27 02:03:25