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

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dc.contributor.authorTountas, Marinos
dc.contributor.authorTopal, Yasemin
dc.contributor.authorPolydorou, Ermioni
dc.contributor.authorSoultati, Anastasia
dc.contributor.authorVerykios, Apostolis
dc.contributor.authorKaltzoglou, Andreas
dc.contributor.authorPapadopoulos, Theodoros A.
dc.date.accessioned2020-03-26T19:42:01Z
dc.date.available2020-03-26T19:42:01Z
dc.date.issued2017
dc.departmentSelçuk Üniversitesien_US
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 photo stability 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 similar to 40 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) carb onyl] thieno [3,4-b] thiophenediylp [6,6]-phenyl-C-70 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-C-60 bisadduct (IC(60)BA), 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_US
dc.description.sponsorshipEuropean Regional Development Fund of the European Union under NSRFEuropean Union (EU); Regional Operational Program of Attica; U.K. Science and Technology Facilities Council (STFC)Science & Technology Facilities Council (STFC) [HCBG125]en_US
dc.description.sponsorshipThis work was performed in the framework of "YDISE" project within GSRT's KRIPIS action, funded by Greece and the European Regional Development Fund of the European Union under NSRF 2007-2013 and the Regional Operational Program of Attica. T.A.P. acknowledges the use of Hartree Centre computational resources via the 3rd BlueJoule Access Programme, under project no. HCBG125, funded by the U.K. Science and Technology Facilities Council (STFC) and local computational facilities provided by the Faculty of Science and Engineering, University of Chester, U.K.en_US
dc.identifier.doi10.1021/acsami.7b04600en_US
dc.identifier.endpage22787en_US
dc.identifier.issn1944-8244en_US
dc.identifier.issue27en_US
dc.identifier.pmid28585803en_US
dc.identifier.scopusqualityQ1en_US
dc.identifier.startpage22773en_US
dc.identifier.urihttps://dx.doi.org/10.1021/acsami.7b04600
dc.identifier.urihttps://hdl.handle.net/20.500.12395/35265
dc.identifier.volume9en_US
dc.identifier.wosWOS:000405764700073en_US
dc.identifier.wosqualityQ1en_US
dc.indekslendigikaynakWeb of Scienceen_US
dc.indekslendigikaynakScopusen_US
dc.indekslendigikaynakPubMeden_US
dc.language.isoenen_US
dc.publisherAMER CHEMICAL SOCen_US
dc.relation.ispartofACS APPLIED MATERIALS & INTERFACESen_US
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanıen_US
dc.rightsinfo:eu-repo/semantics/openAccessen_US
dc.selcuk20240510_oaigen_US
dc.subjectpolymer solar cellsen_US
dc.subjectlacunaryen_US
dc.subjectpolyoxometalatesen_US
dc.subjecttitanium oxideen_US
dc.subjectstabilityen_US
dc.subjectlow work functionen_US
dc.titleLow Work Function Lacunary Polyoxometalates as Electron Transport Interlayers for Inverted Polymer Solar Cells of Improved Efficiency and Stabilityen_US
dc.typeArticleen_US

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