Wide-Bandgap Semiconductors: A Critical Analysis of GaN, SiC, AlGaN, Diamond, and Ga2O3 Synthesis Methods, Challenges, and Prospective Technological Innovations

Abstract

The increasing demand for high-performance Wide-Bandgap (WBG) semiconductors, including GaN, SiC, and emerging Ultrawide-Bandgap (UWBG) materials such as Ga₂O₃ and diamond, has driven significant advancements in epitaxial growth techniques. However, achieving scalability, defect-free growth, and sustainability remains a major challenge. This review systematically evaluates Molecular Beam Epitaxy (MBE), Metal-Organic Chemical Vapor Deposition (MOCVD), Hydride Vapor Phase Epitaxy (HVPE), and other novel growth and hybrid growth techniques, emphasizing energy efficiency, defect control, and environmental impact. Industry 4.0-driven AI-based process optimization and closed-loop recycling have emerged as transformative strategies, reducing waste and improving manufacturing efficiency. Key findings reveal that HVPE enables rapid defect-free GaN fabrication, Hot-Filament CVD enhances SiC growth with superior thermal properties, and Atomic Layer Epitaxy (ALE) achieves sub-nanometer precision crucial for next-generation quantum and RF applications. Despite these advancements, p-type doping in UWBG materials, substrate compatibility, and thermal management remain unresolved challenges. Future research must focus on scalable eco-friendly epitaxy, novel doping mechanisms, and policy-driven sustainability efforts. This review provides a comprehensive roadmap for sustainable WBG semiconductor manufacturing, bridging materials innovation, energy efficiency, and industrial adoption to support the next generation of power electronics and optoelectronics.

Keywords

Wide-bandgap semiconductors / Epitaxial growth / Ultrawide-bandgap semiconductors / Molecular beam epitaxy / Sustainability / Manufacturing

Acknowledgments

The authors express their sincere gratitude to the Agricultural Engineering and Materials Science & Engineering Departments of the School of Engineering Sciences, University of Ghana for their invaluable administrative and technical support during this research. We also extend our appreciation to our colleagues and reviewers from the School of Engineering Sciences, University of Ghana, and the Department of Materials Engineering, Kwame Nkrumah University of Science and Technology for their insightful feedback, which greatly enhanced the quality of this work.

Author Contributions

Conceptualization, L.A.Y., P.S.A. and A.A.M.; Methodology, L.A.Y.; Software, P.S.A.; Validation, A.A.M., P.A.O. and J.A.M.; Formal Analysis, S.T.T. and W.M.Z.; Investigation, R.A.A.A. and B.W.H.; Resources, S.O.-A.; Data Curation, P.S.A.; Writing—Original Draft Preparation, L.A.Y. and P.S.A.; Writing—Review & Editing, L.A.Y., W.M.Z., A.A.M., S.T.T. and J.A.M.; Visualization, R.A.A.A. and B.W.H.; Supervision, L.A.Y.; Project Administration, P.S.A. and S.O.-A.

Ethics Statement

Not applicable.

Informed Consent Statement

Not applicable.

Data Availability Statement

No data was used for the research described in the article.

Funding

Not applicable.

Declaration of Competing Interest

The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.

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