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Balanced Partnership between Donor and Acceptor Components in Nonfullerene Organic Solar Cells with > 12% Efficiency
Peking Univ, Peoples R China.
Chinese Acad Sci, Peoples R China.
Victoria Univ Wellington, New Zealand.
Soochow Univ, Peoples R China.
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2018 (English)In: Advanced Materials, ISSN 0935-9648, E-ISSN 1521-4095, Vol. 30, no 16, article id 1706363Article in journal (Refereed) Published
Abstract [en]

Relative to electron donors for bulk heterojunction organic solar cells (OSCs), electron acceptors that absorb strongly in the visible and even near-infrared region are less well developed, which hinders the further development of OSCs. Fullerenes as traditional electron acceptors have relatively weak visible absorption and limited electronic tunability, which constrains the optical and electronic properties required of the donor. Here, high-performance fullerene-free OSCs based on a combination of a medium-bandgap polymer donor (FTAZ) and a narrow-bandgap nonfullerene acceptor (IDIC), which exhibit complementary absorption, matched energy levels, and blend with pure phases on the exciton diffusion length scale, are reported. The single-junction OSCs based on the FTAZ:IDIC blend exhibit power conversion efficiencies up to 12.5% with a certified value of 12.14%. Transient absorption spectroscopy reveals that exciting either the donor or the acceptor component efficiently generates mobile charges, which do not suffer from recombination to triplet states. Balancing photocurrent generation between the donor and nonfullerene acceptor removes undesirable constraints on the donor imposed by fullerene derivatives, opening a new avenue toward even higher efficiency for OSCs.

Place, publisher, year, edition, pages
WILEY-V C H VERLAG GMBH , 2018. Vol. 30, no 16, article id 1706363
Keywords [en]
fused ring electron acceptors; nonfullerene solar cells; organic solar cells; photophysics
National Category
Atom and Molecular Physics and Optics
Identifiers
URN: urn:nbn:se:liu:diva-147936DOI: 10.1002/adma.201706363ISI: 000430460100014PubMedID: 29513373OAI: oai:DiVA.org:liu-147936DiVA, id: diva2:1209523
Note

Funding Agencies|NSFC [21734001, 51761165023, 21504058, 11474214, 21504066]; Ministry of Science and Technology of China [2014CB932600, 2016YFA0200700]; Office of Naval Research [N000141410221]; NSF [DMR-1507249]; Office of Science, Office of Basic Energy Sciences, of the U.S. Department of Energy [DE-AC02-05CH11231]; Rutherford Discovery fellowship; Knut and Alice Wallenberg Foundation; Swedish Government Strategic Research Area in Materials Science on Functional Materials at Linkoping University [2009-00971]

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

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