Surface passivation effect by fluorine plasma treatment on ZnO for efficiency and lifetime improvement of inverted polymer solar cells

Hdl Handle:
http://hdl.handle.net/10034/617851
Title:
Surface passivation effect by fluorine plasma treatment on ZnO for efficiency and lifetime improvement of inverted polymer solar cells
Authors:
Polydorou, Ermioni; Zeniou, Angelos; Tsikritzis, Dimitrios; Soultati, Anastasia; Sakellis, Ilias; Gardelis, Spyros; Papadopoulos, Theodoros A.; Briscoe, Joe; Palilis, Leonidas C.; Kennou, Stella; Gogolides, Evangelos; Argitis, Panagiotis; Davazoglou, Dimitrios; Vasilopoulou, Maria
Abstract:
Zinc oxide (ZnO) is an important material for polymer solar cells (PSCs) where the characteristics of the interface can dominate both the efficiency and lifetime of the device. In this work we study the effect of fluorine (SF6) plasma surface treatment of ZnO films on the performance of PSCs with an inverted structure. The interaction between fluorine species present in the SF6 plasma and the ZnO surface is also investigated in detail. We provide fundamental insights into the passivation effect of fluorine by analyzing our experimental results and theoretical calculations and we propose a mechanism according to which a fluorine atom substitutes an oxygen atom or occupies an oxygen vacancy site eliminating an electron trap while it may also attract hydrogen atoms thus favoring hydrogen doping. These multiple fluorine roles can reduce both the recombination losses and the electron extraction barrier at the ZnO/fullerene interface improving the selectivity of the cathode contact. Therefore, the fabricated devices using the fluorine plasma treated ZnO show high efficiency and stable characteristics, irrespective of the donor : acceptor combinations in the photoactive blend. Inverted polymer solar cells, consisting of the P3HT:PC71BM blend, exhibited increased lifetime and high power conversion efficiency (PCE) of 4.6%, while the ones with the PCDTBT:PC71BM blend exhibited a PCE of 6.9%. Our champion devices with the PTB7:PC71BM blends reached a high PCE of 8.0% and simultaneously showed exceptional environmental stability when using the fluorine passivated ZnO cathode interlayers.
Affiliation:
National Center for Scientific Research Demokritos; National Center for Scientific Research Demokritos; University of Patras; National Center for Scientific Research Demokritos; National Center for Scientific Research Demokritos; University of Athens; University of Chester; Queen Mary University of London; University of Patras; University of Patras; National Center for Scientific Research Demokritos; National Center for Scientific Research Demokritos; National Center for Scientific Research Demokritos; National Center for Scientific Research Demokritos
Citation:
Polydorou, E., Zeniou, A., Tsikritzis, D., Soultati, A., Sakellis, I., Gardelis, S.. . Vasilopoulou, M. (2016). Surface passivation effect by fluorine plasma treatment on ZnO for efficiency and lifetime improvement of inverted polymer solar cells. J. Mater. Chem. A, 4(3), 11844-11858.
Publisher:
Royal Society of Chemistry
Journal:
Journal of Materials Chemistry A
Publication Date:
24-Jun-2016
URI:
http://hdl.handle.net/10034/617851
DOI:
10.1039/C6TA03594A
Additional Links:
http://pubs.rsc.org/en/content/articlelanding/2016/ta/c6ta03594a#!divAbstract
Type:
Article
Language:
en
ISSN:
2050-7488
EISSN:
2050-7496
Appears in Collections:
Natural Sciences

Full metadata record

DC FieldValue Language
dc.contributor.authorPolydorou, Ermionien
dc.contributor.authorZeniou, Angelosen
dc.contributor.authorTsikritzis, Dimitriosen
dc.contributor.authorSoultati, Anastasiaen
dc.contributor.authorSakellis, Iliasen
dc.contributor.authorGardelis, Spyrosen
dc.contributor.authorPapadopoulos, Theodoros A.en
dc.contributor.authorBriscoe, Joeen
dc.contributor.authorPalilis, Leonidas C.en
dc.contributor.authorKennou, Stellaen
dc.contributor.authorGogolides, Evangelosen
dc.contributor.authorArgitis, Panagiotisen
dc.contributor.authorDavazoglou, Dimitriosen
dc.contributor.authorVasilopoulou, Mariaen
dc.date.accessioned2016-08-02T17:26:42Z-
dc.date.available2016-08-02T17:26:42Z-
dc.date.issued2016-06-24-
dc.identifier.citationPolydorou, E., Zeniou, A., Tsikritzis, D., Soultati, A., Sakellis, I., Gardelis, S.. . Vasilopoulou, M. (2016). Surface passivation effect by fluorine plasma treatment on ZnO for efficiency and lifetime improvement of inverted polymer solar cells. J. Mater. Chem. A, 4(3), 11844-11858.en
dc.identifier.issn2050-7488-
dc.identifier.doi10.1039/C6TA03594A-
dc.identifier.urihttp://hdl.handle.net/10034/617851-
dc.description.abstractZinc oxide (ZnO) is an important material for polymer solar cells (PSCs) where the characteristics of the interface can dominate both the efficiency and lifetime of the device. In this work we study the effect of fluorine (SF6) plasma surface treatment of ZnO films on the performance of PSCs with an inverted structure. The interaction between fluorine species present in the SF6 plasma and the ZnO surface is also investigated in detail. We provide fundamental insights into the passivation effect of fluorine by analyzing our experimental results and theoretical calculations and we propose a mechanism according to which a fluorine atom substitutes an oxygen atom or occupies an oxygen vacancy site eliminating an electron trap while it may also attract hydrogen atoms thus favoring hydrogen doping. These multiple fluorine roles can reduce both the recombination losses and the electron extraction barrier at the ZnO/fullerene interface improving the selectivity of the cathode contact. Therefore, the fabricated devices using the fluorine plasma treated ZnO show high efficiency and stable characteristics, irrespective of the donor : acceptor combinations in the photoactive blend. Inverted polymer solar cells, consisting of the P3HT:PC71BM blend, exhibited increased lifetime and high power conversion efficiency (PCE) of 4.6%, while the ones with the PCDTBT:PC71BM blend exhibited a PCE of 6.9%. Our champion devices with the PTB7:PC71BM blends reached a high PCE of 8.0% and simultaneously showed exceptional environmental stability when using the fluorine passivated ZnO cathode interlayers.en
dc.language.isoenen
dc.publisherRoyal Society of Chemistryen
dc.relation.urlhttp://pubs.rsc.org/en/content/articlelanding/2016/ta/c6ta03594a#!divAbstracten
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/en
dc.subjectZnO surface passivationen
dc.subjectFluorine plasma treatmenten
dc.subjectInverted polymer solar cellsen
dc.titleSurface passivation effect by fluorine plasma treatment on ZnO for efficiency and lifetime improvement of inverted polymer solar cellsen
dc.typeArticleen
dc.identifier.eissn2050-7496-
dc.contributor.departmentNational Center for Scientific Research Demokritos; National Center for Scientific Research Demokritos; University of Patras; National Center for Scientific Research Demokritos; National Center for Scientific Research Demokritos; University of Athens; University of Chester; Queen Mary University of London; University of Patras; University of Patras; National Center for Scientific Research Demokritos; National Center for Scientific Research Demokritos; National Center for Scientific Research Demokritos; National Center for Scientific Research Demokritosen
dc.identifier.journalJournal of Materials Chemistry Aen
dc.date.accepted2016-06-24-
or.grant.openaccessYesen
rioxxterms.funderScience and Technology Facility Council (STFC)en
rioxxterms.identifier.projectN/Aen
rioxxterms.versionPen
rioxxterms.licenseref.startdate2017-06-25-
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