1. Highly efficient inverted ternary organic solar cells with polymer fullerene-free acceptor as a third component material.
- Author
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Zhang, Kan, Liu, Zhiyong, and Wang, Ning
- Subjects
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SOLAR cells , *POLYTHIOPHENES , *THIENYL compounds , *NAPHTHALENE , *WAVELENGTHS - Abstract
Abstract Ternary organic solar cells (OSCs) are fabricate using a single wide-bandgap poly[(2,6-(4,8-bis(5-(2-ethylhexyl)thiophen-2-yl)-benzo[1,2-b:4,5-b0]dithiophene))-alt-(5,5-(10,30-di-2-thienyl-50,70-bis(2-ethylhexyl)benzo[10,20-c:40,50-c0]dithiophene-4,8-dione))] (PBDB-T) as the donor material and 3,9-bis (2-methylene-(3-(1,1-dicyanomethylene)-indanone)-5,5,11,11-tetrakis (4-hexylphenyl)-dithieno[2,3-d:2′, 3′-d′]-s-indaceno[1,2-b:5,6-b']dithiophene) (ITIC) as the acceptor and poly[[N,N′-bis(2-octyldodecyl)-naphthalene-1,4,5,8-bis(dicarboximide)-2,6-diyl]-alt-(3,3′-difluoro-2,2′-bithiophene)-5,5′-diyl] (F N2200) as third component materials. Due to the strong absorption ability at the short-wavelength region. The best power conversion efficiency (PCE) of 10.9% is achieve for the OSCs via incorporating 10 wt% F N2200 in blend-acceptor materials, with an enhance the short-circuit current (J SC) of 17.6 mA cm−2, fill factor (FF) of 68.0% and stable open-circuit voltage (V OC) of 0.91 V relative to binary OSCs. The short-wavelength absorption windows of F N2200 is favourable the harvesting of as many as possible photons and the enhance exciton dissociation ratio at the ITIC/F N2200 interface due to the deeper LUMO energy level of F N2200 relative to ITIC molecule. Meanwhile, the incorporation small amount of F N2200 is weaken monomolecular recombination and bimolecular recombination under open-circuit and short-circuit conditions respectively and enhance the charge carrier mobility. The use of PBDB-T as donor and the blend of ITIC and F N2200 as an electron acceptor provides a useful strategy for exploring high-performance ternary OSCs. Highlights • Ternary OSCs were fabricated with F N2200 as third component materials. • The ternary photoactive layer is weaken charge carrier recombination. • The improvement of exciton-dissociation at the PBDB-T/acceptor interface. • The enhanced photovoltaic performance, especially under weak light intensity. [ABSTRACT FROM AUTHOR]
- Published
- 2019
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