Studying Ion Movement in Perovskite Nanowires with X-ray Spectroscopy
Author Information
Author(s): Liu Yen-Po, Lamers Nils, Zhang Zhaojun, Zaiats Nelia, Mikkelsen Anders, Wallentin Jesper, Dittmann Regina, Timm Rainer
Primary Institution: Lund University
Hypothesis
How do halide ions migrate in perovskite nanowires during electrical operation?
Conclusion
The study reveals that halide ion migration and a redox reaction of lead occur in perovskite nanowires during electrical operation.
Supporting Evidence
- Br– and Cl– ion migration was monitored during device operation.
- A reversible redox reaction of Pb was observed under electrical operation.
- Ion migration occurred at applied biases as low as 0.5 V.
- Surface defects were healed during electrical operation.
- Local variations in potential were mapped along the nanowire.
Takeaway
Scientists looked at tiny wires made of a special material and found that when they used electricity, some parts moved around and changed, which could help make better devices.
Methodology
Operando nanofocused X-ray photoelectron spectroscopy (nano-XPS) was used to study the ion migration in perovskite nanowires during electrical operation.
Limitations
The study may not account for all environmental factors affecting ion migration in practical applications.
Digital Object Identifier (DOI)
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