SKM 2023 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 7: Poster I

HL 7.30: Poster

Monday, March 27, 2023, 13:00–15:00, P2/EG

Wide bandgap aeromaterials and prospects for their applications — •Vladimir Ciobanu, Tudor Braniste, Eduard Monaico, and Ion Tiginyanu — National Center for Materials Study and Testing, Technical University of Moldova, Chisinau, Moldova

We report on the fabrication of aeromaterials based on GaN, Ga2O3, TiO2 and Zn2TiO4 using hydride vapor phase epitaxy (HVPE) or Atomic Layer Deposition (ALD) approaches. The fabrication process is based on growth of the preferred material on sacrificial templates consisting of interconnected ZnO microtetrapods. During the epitaxial growth of GaN at high temperatures and corrosive environment, the ZnO is etched away and, consequently, hollow microtetrapods with the wall thickness of the tubes in the range of 20 - 100 nm are obtained. Further, GaN can be transformed into Ga2O3 through an annealing process at temperature as high as 800 ^∘C. Alternatively, ALD approach is used to fabricate aero-TiO2 or aero-Zn2TiO4 materials using sacrificial ZnO templates.

The fabricated materials demonstrated new interesting properties: aero-GaN exhibits good electromagnetic shielding in X-band and THz region, on the other hand aero-Ga2O3 is completely transparent at GHz and THz frequencies, up to 3 THz. We also established that aero-GaN is characterized by dual hydrophilic-hydrophobic behavior. This phenomenon enabled one to demonstrate novel liquid marbles. Due to high active surface area of developed aero-Ga2O3 decorated with noble metal nanodots, aero-TiO2 and aero-Zn2TiO4, these materials are shown to be promising for photocatalytic applications.