Low Work Function Lacunary Polyoxometalates as Electron Transport Interlayers for Inverted Polymer Solar Cells of Improved Efficiency and Stability

Hdl Handle:
http://hdl.handle.net/10034/620570
Title:
Low Work Function Lacunary Polyoxometalates as Electron Transport Interlayers for Inverted Polymer Solar Cells of Improved Efficiency and Stability
Authors:
Tountas, Marinos; Topal, Yasemin; Polydorou, Ermioni; Soultati, Anastasia; Verykios, Apostolos; Kaltzoglou, Andreas; Papadopoulos, Theodoros A.; Auras, Florian; Seintis, Konstantinos; Fakis, Mihalis; Palilis, Leonidas C.; Tsikritzis, Dimitrios; Kennou, Stella; Koutsoureli, Matroni; Papaioannou, Georgios; Ersoz, Mustafa; Kus, Mahmut; Falaras, Polycarpos; Davazoglou, Dimitrios; Argitis, Panagiotis; Vasilopoulou, Maria
Abstract:
Effective interface engineering has been shown to play a vital role in facilitating efficient charge-carrier transport, thus boosting the performance of organic photovoltaic devices. Herein, we employ water-soluble lacunary polyoxometalates (POMs) as multifunctional interlayers between the titanium dioxide (TiO2) electron extraction/transport layer and the organic photoactive film to simultaneously enhance the efficiency, lifetime, and photostability of polymer solar cells (PSCs). A significant reduction in the work function (WF) of TiO2 upon POM utilization was observed, with the magnitude being controlled by the negative charge of the anion and the selection of the addenda atom (W or Mo). By inserting a POM interlayer with ∼10 nm thickness into the device structure, a significant improvement in the power conversion efficiency was obtained; the optimized POM-modified poly[[4,8-bis[(2-ethylhexyl)oxy]benzo[1,2-b:4,5-b′]dithiophene-2,6-diyl][3-fluoro-2-[(2- 33 ethylhexyl)carbonyl]thieno[3,4-b]thiophenediyl]]:[6,6]-phenyl-C70 butyric acid methyl ester (PTB7:PC70BM)-based PSCs exhibited an efficiency of 8.07%, which represents a 21% efficiency enhancement compared to the reference TiO2 cell. Similar results were obtained in POM-modified devices based on poly(3-hexylthiophene) (P3HT) with electron acceptors of different energy levels, such as PC70BM or indene-C60 bisadduct (IC60BA), which enhanced their efficiency up to 4.34 and 6.21%, respectively, when using POM interlayers; this represents a 25–33% improvement as compared to the reference cells. Moreover, increased lifetime under ambient air and improved photostability under constant illumination were observed in POM-modified devices. Detailed analysis shows that the improvements in efficiency and stability synergistically stem from the reduced work function of TiO2 upon POM coverage, the improved nanomorphology of the photoactive blend, the reduced interfacial recombination losses, the superior electron transfer, and the more effective exciton dissociation at the photoactive layer/POM/TiO2 interfaces.
Affiliation:
National Center for Scientific Research Demokritos; Selcuk University Advanced Technology Research and Application Center; University of Patras; University of Chester; University of Munich; University of Athens
Citation:
Tountas, M., et. al. (2017). Low Work Function Lacunary Polyoxometalates as Electron Transport Interlayers for Inverted Polymer Solar Cells of Improved Efficiency and Stability. ACS Applied Materials and Interfaces, 9(27), 22773-22787. DOI: 10.1021/acsami.7b04600
Publisher:
American Chemical Society
Journal:
ACS Applied Materials and Interfaces
Publication Date:
6-Jun-2017
URI:
http://hdl.handle.net/10034/620570
DOI:
10.1021/acsami.7b04600
Additional Links:
http://pubs.acs.org/doi/abs/10.1021/acsami.7b04600
Type:
Article
Language:
en
Description:
This document is the Accepted Manuscript version of a Published Work that appeared in final form in ACS Applied Materials and Interfaces, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see http://pubs.acs.org/doi/abs/10.1021/acsami.7b04600
EISSN:
1944-8252
Appears in Collections:
Natural Sciences

Full metadata record

DC FieldValue Language
dc.contributor.authorTountas, Marinosen
dc.contributor.authorTopal, Yaseminen
dc.contributor.authorPolydorou, Ermionien
dc.contributor.authorSoultati, Anastasiaen
dc.contributor.authorVerykios, Apostolosen
dc.contributor.authorKaltzoglou, Andreasen
dc.contributor.authorPapadopoulos, Theodoros A.en
dc.contributor.authorAuras, Florianen
dc.contributor.authorSeintis, Konstantinosen
dc.contributor.authorFakis, Mihalisen
dc.contributor.authorPalilis, Leonidas C.en
dc.contributor.authorTsikritzis, Dimitriosen
dc.contributor.authorKennou, Stellaen
dc.contributor.authorKoutsoureli, Matronien
dc.contributor.authorPapaioannou, Georgiosen
dc.contributor.authorErsoz, Mustafaen
dc.contributor.authorKus, Mahmuten
dc.contributor.authorFalaras, Polycarposen
dc.contributor.authorDavazoglou, Dimitriosen
dc.contributor.authorArgitis, Panagiotisen
dc.contributor.authorVasilopoulou, Mariaen
dc.date.accessioned2017-07-20T13:56:18Z-
dc.date.available2017-07-20T13:56:18Z-
dc.date.issued2017-06-06-
dc.identifier.citationTountas, M., et. al. (2017). Low Work Function Lacunary Polyoxometalates as Electron Transport Interlayers for Inverted Polymer Solar Cells of Improved Efficiency and Stability. ACS Applied Materials and Interfaces, 9(27), 22773-22787. DOI: 10.1021/acsami.7b04600en
dc.identifier.doi10.1021/acsami.7b04600-
dc.identifier.urihttp://hdl.handle.net/10034/620570-
dc.descriptionThis document is the Accepted Manuscript version of a Published Work that appeared in final form in ACS Applied Materials and Interfaces, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see http://pubs.acs.org/doi/abs/10.1021/acsami.7b04600en
dc.description.abstractEffective interface engineering has been shown to play a vital role in facilitating efficient charge-carrier transport, thus boosting the performance of organic photovoltaic devices. Herein, we employ water-soluble lacunary polyoxometalates (POMs) as multifunctional interlayers between the titanium dioxide (TiO2) electron extraction/transport layer and the organic photoactive film to simultaneously enhance the efficiency, lifetime, and photostability of polymer solar cells (PSCs). A significant reduction in the work function (WF) of TiO2 upon POM utilization was observed, with the magnitude being controlled by the negative charge of the anion and the selection of the addenda atom (W or Mo). By inserting a POM interlayer with ∼10 nm thickness into the device structure, a significant improvement in the power conversion efficiency was obtained; the optimized POM-modified poly[[4,8-bis[(2-ethylhexyl)oxy]benzo[1,2-b:4,5-b′]dithiophene-2,6-diyl][3-fluoro-2-[(2- 33 ethylhexyl)carbonyl]thieno[3,4-b]thiophenediyl]]:[6,6]-phenyl-C70 butyric acid methyl ester (PTB7:PC70BM)-based PSCs exhibited an efficiency of 8.07%, which represents a 21% efficiency enhancement compared to the reference TiO2 cell. Similar results were obtained in POM-modified devices based on poly(3-hexylthiophene) (P3HT) with electron acceptors of different energy levels, such as PC70BM or indene-C60 bisadduct (IC60BA), which enhanced their efficiency up to 4.34 and 6.21%, respectively, when using POM interlayers; this represents a 25–33% improvement as compared to the reference cells. Moreover, increased lifetime under ambient air and improved photostability under constant illumination were observed in POM-modified devices. Detailed analysis shows that the improvements in efficiency and stability synergistically stem from the reduced work function of TiO2 upon POM coverage, the improved nanomorphology of the photoactive blend, the reduced interfacial recombination losses, the superior electron transfer, and the more effective exciton dissociation at the photoactive layer/POM/TiO2 interfaces.en
dc.language.isoenen
dc.publisherAmerican Chemical Societyen
dc.relation.urlhttp://pubs.acs.org/doi/abs/10.1021/acsami.7b04600en
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/en
dc.subjectPolymer solar cellsen
dc.subjectTitanium oxideen
dc.subjectLacunaryen
dc.subjectPolyoxometalaltesen
dc.titleLow Work Function Lacunary Polyoxometalates as Electron Transport Interlayers for Inverted Polymer Solar Cells of Improved Efficiency and Stabilityen
dc.typeArticleen
dc.identifier.eissn1944-8252-
dc.contributor.departmentNational Center for Scientific Research Demokritos; Selcuk University Advanced Technology Research and Application Center; University of Patras; University of Chester; University of Munich; University of Athensen
dc.identifier.journalACS Applied Materials and Interfacesen
dc.date.accepted2017-06-06-
or.grant.openaccessYesen
rioxxterms.funderSTFCen
rioxxterms.identifier.projectHCBG125en
rioxxterms.versionAMen
rioxxterms.licenseref.startdate2018-06-06-
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