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A Near-Infrared Photoactive Morphology Modifier Leads to Significant Current Improvement and Energy Loss Mitigation for Ternary Organic Solar Cells
Zhejiang Univ, Peoples R China.
Zhejiang Univ, Peoples R China.
Linköping University, Department of Physics, Chemistry and Biology, Biomolecular and Organic Electronics. Linköping University, Faculty of Science & Engineering.
Linköping University, Department of Physics, Chemistry and Biology, Biomolecular and Organic Electronics. Linköping University, Faculty of Science & Engineering.ORCID iD: 0000-0002-2582-1740
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2018 (English)In: ADVANCED SCIENCE, ISSN 2198-3844, Vol. 5, no 8, article id 1800755Article in journal (Refereed) Published
Abstract [en]

Herein, efficient organic solar cells (OSCs) are realized with the ternary blend of a medium band gap donor (poly[(2,6-(4,8-bis(5-(2-ethylhexyl)thiophen-2-yl)-benzo[1,2-b:4,5-b]dithiophene))-alt-(5,5-(1,3-di-2-thienyl-5,7-bis(2-ethylhexyl)benzo[1,2-c:4,5-c]dithiophene-4,8-dione)] (PBDB-T)) with a low band gap acceptor (2,2-((2Z,2Z)-(((2,5-difluoro-1,4-phenylene)bis(4,4-bis(2-ethylhexyl)-4H-cyclopenta[2,1-b:3,4-b]dithiophene-6,2-diyl))bis(methanylylidene))bis(5,6-difluoro-3-oxo-2,3-dihydro-1H-indene-2,1-diylidene))dimalononitrile (HF-PCIC)) and a near-infrared acceptor (2,2-((2Z,2Z)-(((4,4,9,9-tetrakis(4-hexylphenyl)-4,9-dihydro-s-indaceno[1,2-b:5,6-b]dithiophene-2,7-diyl)bis(4-((2-ethylhexyl)oxy)thiophene-5,2-diyl))bis(methanylylidene))bis(5,6-difluoro-3-oxo-2,3-dihydro-1H-indene-2,1-diylidene))dimalononitrile (IEICO-4F)). It is shown that the introduction of IEICO-4F third component into PBDB-T:HF-PCIC blend increases the short-circuit current density (J(sc)) of the ternary OSC to 23.46 mA cm(-2), with a 44% increment over those of binary devices. The significant current improvement originates from the broadened absorption range and the active layer morphology optimization through the introduction of IEICO-4F component. Furthermore, the energy loss of the ternary cells (0.59 eV) is much decreased over that of the binary cells (0.80 eV) due to the reduction of both radiative recombination from the absorption below the band gap and nonradiative recombination upon the addition of IEICO-4F. Therefore, the power conversion efficiency increases dramatically from 8.82% for the binary cells to 11.20% for the ternary cells. This work provides good examples for simultaneously achieving both significant current enhancement and energy loss mitigation in OSCs, which would lead to the further construction of highly efficient ternary OSCs.

Place, publisher, year, edition, pages
WILEY , 2018. Vol. 5, no 8, article id 1800755
Keywords [en]
current enhancement; energy loss; morphology optimization; nonfullerene acceptors; ternary organic solar cells
National Category
Other Chemical Engineering
Identifiers
URN: urn:nbn:se:liu:diva-150870DOI: 10.1002/advs.201800755ISI: 000441869400036PubMedID: 30128263OAI: oai:DiVA.org:liu-150870DiVA, id: diva2:1245894
Note

Funding Agencies|National Natural Science Foundation of China [21734008, 21474088, 51473142, 51561145001, 51620105006, 61721005]; 973 Program [2014CB643503]; Zhejiang Province Science and Technology Plan [2018C01047]; Research Grant Council of Hong Kong [14314216, 4053227, T23-407/13-N]

Available from: 2018-09-06 Created: 2018-09-06 Last updated: 2018-10-02

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