This review explores the application of III–V semiconductor materials in solar-driven photocatalytic systems for green energy production, focusing on hydrogen generation and CO₂ reduction. The review highlights the importance of optimizing solar energy utilization and charge separation efficiency in photocatalytic processes. III–V semiconductors are effective in enhancing solar light absorption, long-term stability, and large-scale production, making them promising candidates for clean energy systems. The review discusses various aspects of III–V semiconductor materials, including their advancements, photocatalytic mechanisms, and applications in hydrogen conversion, CO₂ reduction, environmental remediation, and photocatalytic oxidation and reduction reactions. It emphasizes the significance of establishing eco-friendly systems for CO₂ reduction and hydrogen production. The review aims to promote the development of greener and more sustainable energy sources by encouraging practical applications and advancements in solar-powered photocatalysis. The review also covers different solar water splitting technologies, including photoelectrochemical (PEC), photovoltaic-electrochemical (PV-EC), and photoelectrochemical-photovoltaic (PEC-PV) systems, and their underlying principles. The review discusses the thermodynamic requirements for CO₂ reduction and H₂ conversion, the role of PEC in these processes, and the challenges in achieving high efficiency and stability in solar-driven systems. The review also highlights recent advances in solar hydrogen production, including photocatalytic water splitting, PV-EC water splitting, and PEC/PEC tandem cell water splitting, and their potential for commercial applications. The review concludes that III–V semiconductors offer significant advantages in solar-driven energy systems due to their stability, tunable bandgap, and efficient charge separation. The review emphasizes the need for further research and development to overcome challenges in scaling up these technologies for practical applications.This review explores the application of III–V semiconductor materials in solar-driven photocatalytic systems for green energy production, focusing on hydrogen generation and CO₂ reduction. The review highlights the importance of optimizing solar energy utilization and charge separation efficiency in photocatalytic processes. III–V semiconductors are effective in enhancing solar light absorption, long-term stability, and large-scale production, making them promising candidates for clean energy systems. The review discusses various aspects of III–V semiconductor materials, including their advancements, photocatalytic mechanisms, and applications in hydrogen conversion, CO₂ reduction, environmental remediation, and photocatalytic oxidation and reduction reactions. It emphasizes the significance of establishing eco-friendly systems for CO₂ reduction and hydrogen production. The review aims to promote the development of greener and more sustainable energy sources by encouraging practical applications and advancements in solar-powered photocatalysis. The review also covers different solar water splitting technologies, including photoelectrochemical (PEC), photovoltaic-electrochemical (PV-EC), and photoelectrochemical-photovoltaic (PEC-PV) systems, and their underlying principles. The review discusses the thermodynamic requirements for CO₂ reduction and H₂ conversion, the role of PEC in these processes, and the challenges in achieving high efficiency and stability in solar-driven systems. The review also highlights recent advances in solar hydrogen production, including photocatalytic water splitting, PV-EC water splitting, and PEC/PEC tandem cell water splitting, and their potential for commercial applications. The review concludes that III–V semiconductors offer significant advantages in solar-driven energy systems due to their stability, tunable bandgap, and efficient charge separation. The review emphasizes the need for further research and development to overcome challenges in scaling up these technologies for practical applications.