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Novel small-molecule zwitterionic electrolyte with ultralow work function as cathode modifier for inverted polymer solar cells
East China Normal Univ, Peoples R China.
Soochow Univ, Peoples R China.
Linköping University, Department of Physics, Chemistry and Biology, Surface Physics and Chemistry. Linköping University, Faculty of Science & Engineering.
Linköping University, Department of Physics, Chemistry and Biology, Surface Physics and Chemistry. Linköping University, Faculty of Science & Engineering.
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2018 (English)In: Organic electronics, ISSN 1566-1199, E-ISSN 1878-5530, Vol. 59, p. 15-20Article in journal (Refereed) Published
Abstract [en]

Interfacial compatibility between the electrode and organic semiconductor plays a critical role in controlling the charge transport and hence efficiency of organic solar cell. Here, we introduce a novel small-molecule zwitterionic electrolyte (S1) combined with ZnO as electron transporting interlayer employed for the inverted PTB7:PC71BM bulk heterojunction solar cell. The resulting device with the S1/ZnO stacked interlayer achieves a high PCE of 8.59%, obtaining a 16.2% improvement over the control device performance of 7.4% without the S1 attributed to the significant increased short-circuit current density and fill factor. The interfacial properties are investigated. It is found that the S1/ZnO interlayer possess an ultralow work function of 3.6 eV, which originates from the interfacial double dipole step induced by the zwitterionic side chain electrostatic realignment at interface. The S1/ZnO interlayer exhibits the excellent charge extraction ability, suppresses the charge recombination loss and decreases the series resistance at the active layer/electrode contact.

Place, publisher, year, edition, pages
ELSEVIER SCIENCE BV , 2018. Vol. 59, p. 15-20
Keywords [en]
Interlayer; Work function; Charge transport; Performance; Organic solar cell
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:liu:diva-153712DOI: 10.1016/j.orgel.2018.04.036ISI: 000452862400003OAI: oai:DiVA.org:liu-153712DiVA, id: diva2:1276180
Note

Funding Agencies|National Science Foundation of China [11604099, 11474214, 61474125]; Fundamental Research Funds for the Central Universities; Swedish Foundation for Strategic Research [SE13-0060]; Swedish Research Council [2016-05498]; Goran Gustafsson Foundation for Research in Nature Sciences and Medicine; Swedish Government Strategic Research Area in Materials Science on Functional Materials at Linkoping University [2009 00971]

Available from: 2019-01-07 Created: 2019-01-07 Last updated: 2019-01-07

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