Research in semiconductor crystals, green synthesis of nanoparticles, metal oxide nanoparticles and thin films focuses on developing advanced materials with diverse technological applications. Crystal growth techniques enable the production of high-quality materials essential for semiconductors and optoelectronics devices. The green synthesis of nanoparticles emphasizes eco-friendly methods using biological agents, leading to sustainable solutions in medicine, environmental remediation, and catalysis. Metal oxide nanoparticles, such as MoO 3 and V 2 O 5 , exhibit unique optical, electrical, and antimicrobial properties, making them valuable for photocatalysis, sensors, solar cells, and biomedical applications. Advancements in these fields contribute to innovations in energy, healthcare, and environmental sustainability.