Facile NaF Treatment Achieves 20% Efficient ETL-Free Perovskite Solar Cells

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dc.contributor.authorSadegh, Faranak
dc.contributor.authorAkman, Erdi
dc.contributor.authorProchowicz, Daniel
dc.contributor.authorTavakoli, Mohammad Mahdi
dc.contributor.authorYadav, Pankaj
dc.contributor.authorAkin, Seckin
dc.date.accessioned2024-02-23T14:16:36Z
dc.date.available2024-02-23T14:16:36Z
dc.date.issued2022
dc.departmentNEÜen_US
dc.description.abstractElectron transporting layer (ETL)-free perovskite solar cells (PSCs) exhibit promising progress in photovoltaic devices due to the elimination of the complex and energy-/timeconsuming preparation route of ETLs. However, the performance of ETL-free devices still lags behind conventional devices because of mismatched energy levels and undesired interfacial charge recombination. In this study, we introduce sodium fluoride (NaF) as an interface layer in ETL-free PSCs to align the energy level between the perovskite and the FTO electrode. KPFM measurements clearly show that the NaF layer covers the surface of rough underlying FTO very well. This interface modification reduces the work function of FTO by forming an interfacial dipole layer, leading to band bending at the FTO/perovskite interface, which facilitates an effective electron carrier collection. Besides, the part of Na+ ions is found to be able to migrate into the absorber layer, facilitating enlarged grains and spontaneous passivation of the perovskite layer. As a result, the efficiency of the NaF-treated cell reaches 20%, comparable to those of state-of-the-art ETL-based cells. Moreover, this strategy effectively enhances the operational stability of devices by preserving 94% of the initial efficiency after storage for 500 h under continuous light soaking at 55 degrees C. Overall, these improvements in photovoltaic properties are clear indicators of enhanced interface passivation by NaF-based interface engineering.en_US
dc.description.sponsorshipScientific and Technological Research Council of Turkey (TUBITAK) [119F185]; Turkish Science Academy's Young Scientist Awards Programme (BAGEP)en_US
dc.description.sponsorshipThis research is partially supported by the Scientific and Technological Research Council of Turkey (TUBITAK, Project number: 119F185) . The authors would like to thank Dr. Teoman Ozturk (Selcuk University, Tu ? rkiye) for his contribution in KPFM analyses. S.A. would like to thank the Turkish Science Academy's Young Scientist Awards Programme (BAGEP) .en_US
dc.identifier.doi10.1021/acsami.2c06110
dc.identifier.endpage38641en_US
dc.identifier.issn1944-8244
dc.identifier.issn1944-8252
dc.identifier.issue34en_US
dc.identifier.pmid35979724en_US
dc.identifier.scopus2-s2.0-85136661371en_US
dc.identifier.scopusqualityQ1en_US
dc.identifier.startpage38631en_US
dc.identifier.urihttps://doi.org/10.1021/acsami.2c06110
dc.identifier.urihttps://hdl.handle.net/20.500.12452/12731
dc.identifier.volume14en_US
dc.identifier.wosWOS:000849685500001en_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/closedAccessen_US
dc.subjectEtl Free Perovskite Solar Cellen_US
dc.subjectMetal Alkali Fluorideen_US
dc.subjectBand Bendingen_US
dc.subjectWork Functionen_US
dc.titleFacile NaF Treatment Achieves 20% Efficient ETL-Free Perovskite Solar Cellsen_US
dc.typeArticleen_US

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