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Printed Nonfullerene Organic Solar Cells with the Highest Efficiency of 9.5%
Jinan Univ, Peoples R China.
Linköping University, Department of Physics, Chemistry and Biology, Biomolecular and Organic Electronics. Linköping University, Faculty of Science & Engineering.
South China Univ Technol, Peoples R China.
Jinan Univ, Peoples R China.
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2018 (English)In: ADVANCED ENERGY MATERIALS, ISSN 1614-6832, Vol. 8, no 13, article id 1701942Article in journal (Refereed) Published
Abstract [en]

The current work reports a high power conversion efficiency (PCE) of 9.54% achieved with nonfullerene organic solar cells (OSCs) based on PTB7-Th donor 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) acceptor fabricated by doctor-blade printing, which has the highest efficiency ever reported in printed nonfullerene OSCs. Furthermore, a high PCE of 7.6% is realized in flexible large-area (2.03 cm(2)) indium tin oxide (ITO)-free doctor-bladed nonfullerene OSCs, which is higher than that (5.86%) of the spin-coated counterpart. To understand the mechanism of the performance enhancement with doctor-blade printing, the morphology, crystallinity, charge recombination, and transport of the active layers are investigated. These results suggest that the good performance of the doctor-blade OSCs is attributed to a favorable nanoscale phase separation by incorporating 0.6 vol% of 1,8-diiodooctane that prolongs the dynamic drying time of the doctor-bladed active layer and contributes to the migration of ITIC molecules in the drying process. High PCE obtained in the flexible large-area ITO-free doctor-bladed nonfullerene OSCs indicates the feasibility of doctor-blade printing in large-scale fullerene-free OSC manufacturing. For the first time, the open-circuit voltage is increased by 0.1 V when 1 vol% solvent additive is added, due to the vertical segregation of ITIC molecules during solvent evaporation.

Place, publisher, year, edition, pages
WILEY-V C H VERLAG GMBH , 2018. Vol. 8, no 13, article id 1701942
Keywords [en]
doctor-blading nonfullerene organic solar cells; highest efficiency; large-area ITO-free flexible structures; morphology; processing additives
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Identifiers
URN: urn:nbn:se:liu:diva-147908DOI: 10.1002/aenm.201701942ISI: 000431613800001OAI: oai:DiVA.org:liu-147908DiVA, id: diva2:1209618
Note

Funding Agencies|NSFC [61774077, 61274062, 11204106]; Guangzhou Science and Technology Plan Project; Open Fund of the State Key Laboratory of Luminescent Materials and Devices (South China References University of Technology) [2012-skllmd-10]; Fundamental Research Funds for the Central Universities; Swedish Research Council [VR 621-2013-5561]; China Scholarship Council (CSC) [201306730002]; Jinan University; U.S. Office of Naval Research [N00014-15-1-2244]; DOE, Office of Science; DOE, Office of Basic Energy Sciences

Available from: 2018-05-23 Created: 2018-05-23 Last updated: 2018-06-18

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Jin, YingzhiZhang, Fengling
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