AL2O3+Ga2O3-β Thin Film on Sapphire Substrate

Overview

The AL2O3+Ga2O3-β Thin Film on Sapphire Substrate is a high-purity, epitaxially textured heterostructure engineered for advanced optoelectronic and power device research. This product integrates a ~400 nm thick β-phase gallium oxide (Ga2O3) layer—grown via spin coating followed by controlled thermal annealing—onto a single-side polished c-plane (0001) sapphire (Al2O3) substrate measuring 10 × 10 × 0.5 mm. The β-Ga2O3 film exhibits preferential crystallographic texture along the (201) plane, a characteristic critical for enabling anisotropic charge transport and polarization-matched heterointerfaces in wide-bandgap semiconductor devices. Sapphire serves as a chemically inert, thermally stable, and lattice-mismatch-tolerant platform for β-Ga2O3 growth, offering excellent transparency from deep UV to near-IR and high dielectric breakdown strength (>8 MV/cm). Unlike bulk-grown substrates, this spin-coated/annealed configuration provides a cost-effective, scalable route to prototype-grade β-Ga2O3 layers while maintaining sufficient structural coherence for fundamental studies in field-effect transistors (FETs), Schottky diodes, solar-blind UV photodetectors, and heterojunction-based high-electron-mobility transistors (HEMTs).

Key Features

• Epitaxially textured β-Ga2O3 layer with (201)-oriented grain alignment, verified by XRD θ–2θ and pole-figure analysis
• Precise thickness control at ~400 nm, optimized for carrier confinement and optical absorption depth in UV-selective applications
• High-quality c-plane sapphire substrate (Al2O3), single-side polished to Ra < 0.3 nm surface roughness
• Thermally stable interface with minimal interdiffusion up to 800 °C in inert ambient
• Low particulate contamination: fabricated and packaged under ISO Class 4 (100-level) cleanroom conditions
• Vacuum-sealed in static-dissipative, moisture-barrier cleanroom bags compliant with SEMI E10 and ISO 14644-1 standards

Sample Compatibility & Compliance

This thin-film structure is compatible with standard microfabrication workflows including photolithography, e-beam evaporation, sputtering, and reactive ion etching (RIE). The sapphire substrate supports high-temperature processing without warping or degradation, making it suitable for post-deposition anneals and metallization steps. All handling and packaging adhere to semiconductor-grade cleanliness protocols: substrates are qualified per SEMI F78 (Particle Counting on Wafers) and meet ASTM F1299 requirements for optical substrate surface quality. While not certified for production-line use under IATF 16949 or ISO 9001, the material is routinely employed in academic and industrial R&D labs conducting GLP-aligned device physics studies. Traceability documentation—including lot-specific XRD reports and AFM surface topography summaries—is available upon request.

Software & Data Management

No embedded firmware or proprietary software is associated with this passive thin-film component. However, characterization data generated from this substrate (e.g., XRD scans, Hall effect measurements, TEM cross-sections) can be integrated into standard lab data management systems such as LabArchives, Benchling, or custom LIMS platforms. Metadata fields—including lot number, annealing profile (ramp rate, dwell time, ambient gas), and pre-characterization surface inspection logs—are maintained in accordance with FAIR (Findable, Accessible, Interoperable, Reusable) principles. For regulated environments requiring audit trails, users may configure electronic lab notebooks (ELNs) to enforce 21 CFR Part 11-compliant electronic signatures during data entry and report generation.

Applications

• Proof-of-concept development of β-Ga2O3-based vertical power diodes and lateral enhancement-mode FETs
• Investigation of polarization-induced two-dimensional electron gas (2DEG) formation at the Ga2O3/sapphire interface
• UV photodetector responsivity calibration in the 200–280 nm solar-blind region
• Thermal stability benchmarking of Ga2O3 dielectric stacks under accelerated aging conditions
• Reference material for cross-laboratory validation of XRD texture analysis algorithms
• Substrate for subsequent MBE or MOCVD overgrowth of AlGaN or InGaO heterolayers

FAQ

Is this a single-crystal β-Ga2O3 epilayer?
No—it is a polycrystalline but strongly (201)-textured β-Ga2O3 film produced by solution-based processing. It does not exhibit full single-crystal continuity but delivers sufficient orientation coherence for exploratory device integration.
Can the sapphire substrate be reused after film removal?
Yes—sapphire is highly resistant to common wet etchants (e.g., HCl, HF, KOH) and plasma ashing. Standard cleaning protocols (RCA-1/RCA-2) restore surface integrity for repolishing or reprocessing.
What is the typical RMS surface roughness of the as-received Ga2O3 layer?
Measured by AFM over 5 × 5 µm² areas, RMS roughness ranges between 1.2–2.4 nm depending on annealing uniformity; values are reported per lot.
Do you provide XRD or Raman spectra for each batch?
Yes—certified XRD θ–2θ scans and (201) pole figures are included in the Certificate of Analysis (CoA) for every shipment.
Is the substrate suitable for direct metal contact deposition without adhesion layers?
Ti/Au and Ni/Au contacts adhere robustly to the Ga2O3 surface after O₂ plasma activation; however, a 5-nm Ti or Cr adhesion layer is recommended for long-term thermal cycling reliability above 150 °C.