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pi-pi Stacking Distance and Phase Separation Controlled Efficiency in Stable All-Polymer Solar Cells
Linköping University, Department of Physics, Chemistry and Biology, Biomolecular and Organic Electronics. Linköping University, Faculty of Science & Engineering. Xi An Jiao Tong Univ, Peoples R China.
Xi An Jiao Tong 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.
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2019 (English)In: Polymers, ISSN 2073-4360, E-ISSN 2073-4360, POLYMERS, Vol. 11, no 10, article id 1665Article in journal (Refereed) Published
Abstract [en]

The morphology of the active layer plays a crucial role in determining device performance and stability for organic solar cells. All-polymer solar cells (All-PSCs), showing robust and stable morphologies, have been proven to give better thermal stability than their fullerene counterparts. However, outstanding thermal stability is not always the case for polymer blends, and the limiting factors responsible for the poor thermal stability in some All-PSCs, and how to obtain higher efficiency without losing stability, still remain unclear. By studying the morphology of poly [2,3-bis (3-octyloxyphenyl) quinoxaline-5,8-diyl-alt-thiophene-2,5-diyl](TQ1)/poly[4,8-bis[5-(2-ethylhexyl)-2-thienyl]benzo[1,2-b:4,5-b ]dithiophene-alt-(4-(2-ethylhexyl)-3-fluorothieno[3,4-b]thiophene-)-2-carboxylate-2-6-diyl]] (PCE10)/PNDI-T10 blend systems, we found that the rearranged molecular packing structure and phase separation were mainly responsible for the poor thermal stability in devices containing PCE10. The TQ1/PNDI-T10 devices exhibited an improved PCE with a decreased pi-pi stacking distance after thermal annealing; PCE10/PNDI-T10 devices showed a better pristine PCE, however, thermal annealing induced the increased pi-pi stacking distance and thus inferior hole conductivity, leading to a decreased PCE. Thus, a maximum PCE could be achieved in a TQ1/PCE10/PNDI-T10 (1/1/1) ternary system after thermal annealing resulting from their favorable molecular interaction and the trade-off of molecular packing structure variations between TQ1 and PCE10. This indicates that a route to efficient and thermal stable All-PSCs can be achieved in a ternary blend by using material with excellent pristine efficiency, combined with another material showing improved efficiency under thermal annealing.

Place, publisher, year, edition, pages
MDPI, 2019. Vol. 11, no 10, article id 1665
Keywords [en]
all-polymer solar cells; crystallinity; device stability; molecular packing structure; morphology; thermal annealing
National Category
Polymer Chemistry
Identifiers
URN: urn:nbn:se:liu:diva-162350DOI: 10.3390/polym11101665ISI: 000495382700134PubMedID: 31614825Scopus ID: 2-s2.0-85073358689OAI: oai:DiVA.org:liu-162350DiVA, id: diva2:1374027
Note

Funding Agencies|Knut and Alice WallenbergKnut & Alice Wallenberg Foundation; Ministry of Science and TechnologyMinistry of Education, Culture, Sports, Science and Technology, Japan (MEXT) [2016YFA0200700]; National Natural Science Foundation of ChinaNational Natural Science Foundation of China [21704082, 21875182]; 111 project 2.0 [BP2018008]; Natural Science Foundation of Jiangsu ProvinceJiangsu Planned Projects for Postdoctoral Research FundsNatural Science Foundation of Jiangsu Province [BK20171007]; China Postdoctoral Science FoundationChina Postdoctoral Science Foundation [2017M623162, 2016M601784, 2017T100358]; Wenner-Gren foundation [UPD2016-0144]

Available from: 2019-11-28 Created: 2019-11-28 Last updated: 2019-12-04Bibliographically approved

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