Superionic phase transition in individual silver selenide nanowires
Silver selenide (Ag 2 Se) is a promising material for applications as a solid-state electrolyte, with a superionic phase transition at 133 °C. Here, we studied the temperature dependent transport properties of single Ag 2 Se nanowires in a transistor geometry, which allowed us to determine charge ca...
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Veröffentlicht in: | Nanoscale 2021-05, Vol.13 (17), p.817-823 |
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Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | Silver selenide (Ag
2
Se) is a promising material for applications as a solid-state electrolyte, with a superionic phase transition at 133 °C. Here, we studied the temperature dependent transport properties of single Ag
2
Se nanowires in a transistor geometry, which allowed us to determine charge carrier type, concentration, and mobility below and above the superionic phase transition temperature. We found the majority charge carriers to be n-type in the temperature range of 30-150 °C. Across the superionic phase-transition, we observed a sudden increase in conductivity by about 30%, which was accompanied by an increase in charge carrier density by about 200% and a decrease in mobility by about 45%. Interestingly, the size dependent shift of the transition temperatures to below 100 °C in our wires is much more pronounced than for nanocrystals of comparable size. This surprising and potentially useful effect could be caused by changes in crystal structure arising from the synthesis process.
The superionic phase transition temperature in Ag
2
Se nanowires is diameter dependent and suppressed to below 100 °C. An increase in charge carrier density accompanied by a decrease in mobility was observed across the superionic phase transition. |
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ISSN: | 2040-3364 2040-3372 |
DOI: | 10.1039/d1nr00491c |