2021 Fiscal Year Annual Research Report
Frequency Domain Characterization of Optically Controlled Processes in Perovskite Materials
| Project/Area Number |
20K15028
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| Research Institution | Kyushu University |
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Principal Investigator |
Klotz Dino 九州大学, カーボンニュートラル・エネルギー国際研究所, 助教 (00814849)
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| Project Period (FY) |
2020-04-01 – 2022-03-31
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| Keywords | opto-ionics / ionic conductivity / light effect / grain boundaries / impedance |
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| Outline of Annual Research Achievements |
In this project, we focused on light interaction of perovskite materials. One part of the results was establishing a detailed perspective that deconvoluted the impedance response of perovskite solar cells. The other part of the project was the discovery of an opto-ionic effect happening at grain boundaries of ionic conductors, such as perovskite materials. The experiments for this part were performed on 3%Gd-dopedCeO2 (GDC, one of the most prominent ionic conductors and model material for ionic conduction). The new opto-ionic effect immensely increases the ionic conductivity of the grain boundaries of polycrystalline materials, one of the major drawbacks for ionic conduction in technical materials. It could be shown that the space-charge region and the potential barrier caused by those can be mitigated by light above the bandgap. Photo-generated electron-hole pairs compensate the space-charges but do not lead to electronic conductivity.
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| Remarks |
The first paper in the paper list created a lot of attention. It was featured on the Nature Materials cover (1), and it was reported in more
than 20 news outlets.
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