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Modulating Structure Ordering via Side-Chain Engineering of Thieno[3,4-b]thiophene-Based Electron Acceptors for Efficient Organic Solar Cells with Reduced Energy Losses
Chinese Acad Sci, Peoples R China; Univ Chinese Acad Sci, Peoples R China.
Chinese Acad Sci, Peoples R China; Univ Chinese Acad Sci, Peoples R China.
Linköping University, Department of Physics, Chemistry and Biology, Biomolecular and Organic Electronics. Linköping University, Faculty of Science & Engineering.
Ulsan Natl Inst Sci and Technol, South Korea.
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2019 (English)In: ACS Applied Materials and Interfaces, ISSN 1944-8244, E-ISSN 1944-8252, Vol. 11, no 38, p. 35193-35200Article in journal (Refereed) Published
Abstract [en]

Nonfullerene-based organic solar cells (OSCs) have made a huge breakthrough in the recent years. Introducing a proper side chain on the pi-conjugated backbone plays a vital role for further improving the power conversion efficiency (PCE) of OSCs due to easy tuning of the physical properties of the molecule such as absorption, energetic level, solid-state stacking, and charge transportation. More importantly, the side chain significantly affected the blend films morphology and thus determined the PCEs of the devices. In this work, two low-band-gap nonfullerene acceptors, ATT-4 and ATT-5, with an alkyl or branched alkyl substitute on indacenodithiophene (IDT) and thieno[3,4-b]thiophene (TbT) backbone were synthesized for investigating the effect of the substituent on the performance of the nonfullerene acceptors (NFAs). In comparison to ATT-1 with p-hexylphenyl-substituted IDT and n-octyl-substituted TbT moieties, ATT-4 and ATT-5 exhibit better crystallinity with shorter interchain distance and ordered molecular structure in neat and the corresponding blend films. The tailored ATT-5 exhibits a high PCE of 12.36% with a V-oc of 0.93 V, J(sc) of 18.86 mA cm(-2), and fill factor (FF) of 0.71, blending with a wide-band-gap polymer donor PBDB-T. Remarkably, although ATT-4 and ATT-5 exhibit broader light absorption, the devices obtained higher V-oc than that of ATT-1 mainly due to the reduced nonradiative recombination in the blend films. These results implied that side-chain engineering is an efficient approach to regulate the electronic structure and molecular packing of NFAs, which can well match with polymer donor, and obtain high PCEs of the OSCs with improved V-oc, J(sc), and FF, simultaneously.

Place, publisher, year, edition, pages
AMER CHEMICAL SOC , 2019. Vol. 11, no 38, p. 35193-35200
Keywords [en]
organic solar cells; nonfullerene acceptors; thieno[3, 4-b]thiophene; side-chain engineering; energy loss
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:liu:diva-161012DOI: 10.1021/acsami.9b10641ISI: 000488322900068PubMedID: 31405275OAI: oai:DiVA.org:liu-161012DiVA, id: diva2:1367490
Note

Funding Agencies|National Key R&D Program of China [2017YFA0204700]; Strategic Priority Research Program of the Chinese Academy of SciencesChinese Academy of Sciences [XDB12010200]; National Natural Science Foundation of ChinaNational Natural Science Foundation of China [21572234, 21661132006, 91833304]

Available from: 2019-11-04 Created: 2019-11-04 Last updated: 2019-11-04

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