Journal
SCIENCE ADVANCES
Volume 5, Issue 10, Pages -Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/sciadv.aax5733
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Funding
- Japan Society for the Promotion of Science (JSPS) [25000003, 15H02022, 18K14121]
- JST CREST [JPMJCR18T2]
- Mayekawa Houonkai Foundation
- Tanaka Foundation
- Grants-in-Aid for Scientific Research [18K14121, 15H02022] Funding Source: KAKEN
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High-temperature operation of semiconductor devices is widely demanded for switching/sensing purposes in automobiles, plants, and aerospace applications. As alternatives to conventional Si-based Schottky diodes usable only at 200 degrees C or less, Schottky interfaces based on wide-bandgap semiconductors have been extensively studied to realize a large Schottky barrier height that makes high-temperature operation possible. Here, we report a unique crystalline Schottky interface composed of a wide-gap semiconductor beta-Ga2O3 and a layered metal PdCoO2. At the thermally stable all-oxide interface, the polar layered structure of PdCoO2 generates electric dipoles, realizing a large Schottky barrier height of similar to 1.8 eV, well beyond the 0.7 eV expected from the basal Schottky-Mott relation. Because of the naturally formed homogeneous electric dipoles, this junction achieved current rectification with a large on/off ratio approaching 10(8) even at a high temperature of 350 degrees C. The exceptional performance of the PdCoO2/beta-Ga2O3 Schottky diodes makes power/sensing devices possible for extreme environments.
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