Investigation of Optical and Electrical Properties of Laser Deposited CdS Thin Films to be used in Photoelectric Applications

Master's Thesis from the year 2004 in the subject Physics - Applied physics, Cairo University (National Institute of Laser Enhanced Sciences (NILES)), course: Laser Systems Department, language: English, abstract: Unlocking the potential of next-generation solar cells and optoelectronic devices requires a deep dive into the synthesis and characterization of advanced materials. This book embarks on a comprehensive exploration of Cadmium Sulfide (CdS) thin films, meticulously crafted using the sophisticated technique of laser deposition. Journey through a detailed investigation of the intricate relationships between a film's atomic structure and its resulting optical and electrical behaviors. Readers will gain invaluable insights into the fundamental physics governing laser-target interaction, plume dynamics, and the subsequent film growth, forming a robust understanding of the entire deposition process. Discover how cutting-edge experimental techniques, including X-ray diffraction (XRD) and scanning electron microscopy (SEM), are employed to unravel the secrets of the CdS microstructure, revealing critical parameters like crystallite size and microstrain. Explore a wealth of data on the optical properties of these films, including their transmittance, reflectance, and absorption characteristics across a broad spectrum, allowing for precise determination of crucial optical constants. Furthermore, the book delves into the electrical properties of CdS thin films, analyzing AC conductivity and dielectric behavior to assess their suitability for diverse photoelectric applications. Grasp the nuances of photoconductivity mechanisms and spectral response, crucial for optimizing device performance. Through rigorous analysis and insightful discussion, this book illuminates the path toward tailoring CdS thin films for enhanced performance in solar cells, photodetectors, and other advanced technological applications. It serves as an indispensable resource for researchers, engineers, and students seeking to master the art and science of thin film deposition and characterization, providing a roadmap for innovation in the ever-evolving field of optoelectronics, offering pathways for creating novel materials with enhanced light absorption and charge transport capabilities that are paramount for efficient energy conversion and advanced optoelectronic functionalities. It also unveils an in-depth exploration of plasma plume characteristics, a critical factor influencing the quality and properties of the deposited films, and explains complex concepts such as the energy band structure of semiconductors.