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Toward an alternative approach for the preparation of low-temperature titanium dioxide blocking underlayers for perovskite solar cells
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2019 (English)In: Journal of Materials Chemistry A, ISSN 2050-7488, Vol. 7, no 17, p. 10729-10738Article in journal (Refereed) Published
Abstract [en]

The anodic electrodeposition method is investigated as an alternative technique for the preparation of a titanium oxide (TiO 2 ) blocking underlayer (UL) for perovskite solar cells (PSCs). Extremely thin Ti IV -based films are grown from aqueous acidic titanium(iii) chloride in an electrochemical cell at room temperature. This precursor layer is converted to the UL (ED-UL), in a suitable state for PSC applications, by undertaking a sintering step at 450 °C for half an hour. PSCs with the composition of the light-absorbing material FA 0.85 MA 0.10 Cs 0.05 Pb(I 0.87 Br 0.13 ) 3 (FA and MA denote the formamidinium and methylammonium cations, respectively) based on the ED-UL are compared with PSCs with the UL of a standard type prepared by the spray-pyrolysis method at 450 °C from titanium diisopropoxide bis(acetylacetonate) (SP-UL). We obtain power conversion efficiencies (PCEs) of over 20% for mesoscopic perovskite devices employing both ED-ULs and SP-ULs. Slightly higher fill factor values are observed for ED-UL-based devices. In addition, ED-ULs prepared by the same method have also been applied in planar PSCs, resulting in a PCE exceeding 17%, which is comparable to that for similar PSCs with an SP-UL. The preparation of ED-ULs with a lower sintering temperature, 150 °C, has also been examined. The efficiency of a planar PSC incorporating this underlayer was 14%. These results point out to the possibility of applying ED-ULs in flexible planar PSCs in the future.

Place, publisher, year, edition, pages
Royal Society of Chemistry , 2019. Vol. 7, no 17, p. 10729-10738
Keywords [en]
Anodic oxidation, Chlorine compounds, Efficiency, Lead compounds, Perovskite, Sintering, Solar cells, Spray pyrolysis, Temperature, Titanium dioxide, Titanium oxides, Absorbing materials, Acetylacetonates, Anodic electrodeposition, Low temperatures, Lower sintering temperatures, Methylammonium cations, Power conversion efficiencies, Spray pyrolysis method, Perovskite solar cells
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Materials Chemistry
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URN: urn:nbn:se:kth:diva-252234DOI: 10.1039/c8ta04246bISI: 000472183200061Scopus ID: 2-s2.0-85064966914OAI: oai:DiVA.org:kth-252234DiVA, id: diva2:1323514
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QC 20190612

Available from: 2019-06-12 Created: 2019-06-12 Last updated: 2019-07-29Bibliographically approved

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Sloboda, TamaraCappel, Ute B.

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