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Pàgina inicial > Articles > Articles publicats > Puzzling robust 2D metallic conductivity in undoped β-Ga2O3 thin films |
Data: | 2019 |
Resum: | Here, we report the analogy of an extremely stable topological-like ultra-wide bandgap insulator, a solid that is a pure insulator in its bulk but has a metallic conductive surface, presenting a two-dimensional conductive channel at its surface that challenges our current thinking about semiconductor conductivity engineering. Nominally undoped epitaxial β-Ga O thin films without any detectable defect (after a range of state-of-the-art techniques) showed the unexpectedly low resistivity of 3 × 10 Ωcm which was found to be also resistant to high dose proton irradiation (2 MeV, 5 × 10 cm dose) and was largely invariant (metallic) over the phenomenal temperature range of 2 K up to 850 K. The unique resilience and stability of the electrical properties under thermal and highly ionizing radiation stressing, combined with the extended transparency range (thanks to the ultra-wide bandgap) and the already known toughness under high electrical field could open up new perspectives for use as expanded spectral range transparent electrodes (e. g. , for UV harvesting solar cells or UV LEDs/lasers) and robust Ohmic contacts for use in extreme environments/applications and for novel optoelectronic and power device concepts. |
Ajuts: | Ministerio de Economía y Competitividad ENE2015-74275-JIN Ministerio de Economía y Competitividad SEV-2013-0295 |
Drets: | Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, i la comunicació pública de l'obra, sempre que no sigui amb finalitats comercials, i sempre que es reconegui l'autoria de l'obra original. No es permet la creació d'obres derivades. |
Llengua: | Anglès |
Document: | Article ; recerca ; Versió sotmesa a revisió |
Matèria: | Electron accumulation ; Ga2O3 ; Transport properties ; Wide bandgap insulator |
Publicat a: | Materials today physics, Vol. 8 (March 2019) , p. 10-17, ISSN 2542-5293 |
Preprint 22 p, 880.5 KB |