Toward an alternative approach for the preparation of low-temperature titanium dioxide blocking underlayers for perovskite solar cells
| Autor: | Shaik M. Zakeeruddin, Tamara Sloboda, Kazuteru Nonomura, Anders Hagfeldt, Nick Vlachopoulos, Ute B. Cappel, Lichen Zhao, Than Zaw Oo, Sebastian Svanström, Su Htike Aung, Michael Grätzel |
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| Rok vydání: | 2019 |
| Předmět: |
Aqueous solution
Materials science Renewable Energy Sustainability and the Environment Oxide Sintering chemistry.chemical_element 02 engineering and technology General Chemistry 021001 nanoscience & nanotechnology 7. Clean energy Electrochemical cell chemistry.chemical_compound Formamidinium chemistry Chemical engineering Titanium dioxide General Materials Science 0210 nano-technology Titanium Perovskite (structure) |
| Zdroj: | Journal of Materials Chemistry A. 7:10729-10738 |
| ISSN: | 2050-7496 2050-7488 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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