Details

Autor(en) / Beteiligte

• Mazzolini, Piero
• Fogarassy, Zsolt
• Parisini, Antonella
• Mezzadri, Francesco
• Diercks, David
• Bosi, Matteo
• Seravalli, Luca
• Sacchi, Anna
• Spaggiari, Giulia
• Bersani, Danilo
• Bierwagen, Oliver
• Janzen, Benjamin Moritz
• Marggraf, Marcella Naomi
• Wagner, Markus R.
• Cora, Ildiko
• Pécz, Béla
• Tahraoui, Abbes
• Bosio, Alessio
• Borelli, Carmine
• Leone, Stefano
• Fornari, Roberto

Titel

Silane‐Mediated Expansion of Domains in Si‐Doped κ‐Ga2O3 Epitaxy and its Impact on the In‐Plane Electronic Conduction

Ist Teil von

• Advanced functional materials, 2023-01, Vol.33 (2), p.n/a

Ort / Verlag

Hoboken: Wiley Subscription Services, Inc

Erscheinungsjahr

2023

Link zum Volltext

Quelle

Wiley Online Library

Beschreibungen/Notizen

• Unintentionally doped (001)‐oriented orthorhombic κ‐Ga2O3 epitaxial films on c‐plane sapphire substrates are characterized by the presence of ≈ 10 nm wide columnar rotational domains that can severely inhibit in‐plane electronic conduction. Comparing the in‐ and out‐of‐plane resistance on well‐defined sample geometries, it is experimentally proved that the in‐plane resistivity is at least ten times higher than the out‐of‐plane one. The introduction of silane during metal‐organic vapor phase epitaxial growth not only allows for n‐type Si extrinsic doping, but also results in the increase of more than one order of magnitude in the domain size (up to ≈ 300 nm) and mobility (highest µ ≈ 10 cm2V−1s−1, with corresponding lowest ρ ≈ 0.2 Ωcm). To qualitatively compare the mean domain dimension in κ‐Ga2O3 epitaxial films, non‐destructive experimental procedures are provided based on X‐ray diffraction and Raman spectroscopy. The results of this study pave the way to significantly improved in‐plane conduction in κ‐Ga2O3 and its possible breakthrough in new generation electronics. The set of cross‐linked experimental techniques and corresponding interpretation here proposed can apply to a wide range of material systems that suffer/benefit from domain‐related functional properties. κ‐Ga2O3 has great potential in new generation electronics, but its in‐plane electrical properties are affected by nanometer‐sized rotational domains. Experimental procedures are provided to structurally and electrically characterize such defective system and a practical mean (i.e., silane flow control) is suggested to significantly limit domain influence in κ‐Ga2O3. This experimental approach is of potential interest for several material systems with domain‐mediated functional properties.