Defects and Doping in Semiconductor Materials: A Theoretical and Experimental Review

Abstract

Defects and doping play a crucial role in defining the electrical, optical, and thermal properties of semiconductor materials, making them indispensable in modern electronics and optoelectronic devices. This review provides a comprehensive theoretical and experimental analysis of how defects influence carrier transport and how controlled doping techniques optimize semiconductor performance. Various defect types, including intrinsic and extrinsic defects, are examined, along with their impact on band structure and electronic properties. Theoretical models such as density functional theory (DFT) and experimental techniques like photoluminescence spectroscopy, X-ray diffraction, and Hall effect measurements are discussed in detail. Furthermore, an experimental study is conducted to analyze the impact of doping on silicon and gallium nitride semiconductors, utilizing ion implantation and diffusion methods. Results indicate that controlled doping significantly enhances carrier mobility while excessive defects degrade material performance. The study also explores advanced defect engineering techniques for applications in high-performance electronics, optoelectronics, and quantum computing. Despite remarkable advancements, challenges remain in doping uniformity, defect control, and long-term stability. Future research should focus on novel defect-engineered materials and hybrid semiconductor systems to achieve superior performance in next-generation electronic devices.