Origin of Pyroelectricity in Ferroelectric HfO 2
| Autor: | L. H. Liu, Sokrates T. Pantelides, Jian Liu, S. Liu, B. Hanrahan |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Structural phase
Materials science Condensed matter physics Doping General Physics and Astronomy 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences Ferroelectricity Piezoelectricity Pyroelectricity Phase (matter) 0103 physical sciences Orthorhombic crystal system 010306 general physics 0210 nano-technology |
| Zdroj: | Physical Review Applied. 12 |
| ISSN: | 2331-7019 |
| DOI: | 10.1103/physrevapplied.12.034032 |
| Popis: | The emergent pyroelectricity in the ferroelectric (orthorhombic $P\phantom{\rule{0}{0ex}}c\phantom{\rule{0}{0ex}}a{2}_{1}$) phase of CMOS-compatible hafnia offers great potential for future infrared-sensing and energy-harvesting applications, but an understanding of the phenomenon in this particular compound is still lacking. The authors use first-principles calculations to show that pyroelectricity arises unexpectedly from the $s\phantom{\rule{0}{0ex}}e\phantom{\rule{0}{0ex}}c\phantom{\rule{0}{0ex}}o\phantom{\rule{0}{0ex}}n\phantom{\rule{0}{0ex}}d\phantom{\rule{0}{0ex}}a\phantom{\rule{0}{0ex}}r\phantom{\rule{0}{0ex}}y$ effect in ferroelectric HfO${}_{2}$, due to the peculiarity of its piezoelectricity. They also find an orthorhombic-to-tetragonal structural phase transition associated with a giant pyroelectric response, which can be further enhanced by doping with Si. |
| Databáze: | OpenAIRE |
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