Astrid-Caroline Knall (Author), Samuel Rabensteiner (Author), Sebastian F. Hoefler (Author), Matiss Reinfelds (Author), Mathias A. Hobisch (Author), Heike M. A. Ehmann (Author), N. Pastukhova (Author), Egon Pavlica (Author), Gvido Bratina (Author), Ilie Hanzu (Author)

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.

Keywords

non-fullerene solar cells;charge transport;charge mobility;power conversion efficiency;

Data

Language: English
Year of publishing:
Typology: 1.01 - Original Scientific Article
Organization: UNG - University of Nova Gorica
UDC: 53
COBISS: 48862979 Link will open in a new window
ISSN: 1369-9261
Views: 1803
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Other data

URN: URN:SI:UNG
Type (COBISS): Not categorized
Pages: str. 1001-1009
Volume: ǂVol. ǂ45
Issue: ǂiss. ǂ2
Chronology: 2021
DOI: 10.1039/D0NJ04573J
ID: 12504011