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Issue 17, 2019
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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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Abstract

The anodic electrodeposition method is investigated as an alternative technique for the preparation of a titanium oxide (TiO2) blocking underlayer (UL) for perovskite solar cells (PSCs). Extremely thin TiIV-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 FA0.85MA0.10Cs0.05Pb(I0.87Br0.13)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.

Graphical abstract: Toward an alternative approach for the preparation of low-temperature titanium dioxide blocking underlayers for perovskite solar cells

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Publication details

The article was received on 07 May 2018, accepted on 26 Mar 2019 and first published on 26 Mar 2019


Article type: Paper
DOI: 10.1039/C8TA04246B
J. Mater. Chem. A, 2019,7, 10729-10738

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    Toward an alternative approach for the preparation of low-temperature titanium dioxide blocking underlayers for perovskite solar cells

    S. H. Aung, L. Zhao, K. Nonomura, T. Z. Oo, S. M. Zakeeruddin, N. Vlachopoulos, T. Sloboda, S. Svanström, U. B. Cappel, A. Hagfeldt and M. Grätzel, J. Mater. Chem. A, 2019, 7, 10729
    DOI: 10.1039/C8TA04246B

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