The book presents current R&D and new trends in the field of solar cell technologies. Topics covered include fabrication methods, various types of cell design, versatile applications of solar cells, PEDOT:PSS thermoelectric materials, transparent conducting electrodes, simulation models for solar photovoltaic materials, and hybrid materials for solar cells. Keywords: Optoelectronic Devices, PEDOT:PSS Materials, Nanomaterials, Transparent Electrodes, Hybrid Solar Cell Materials, Simulation Models, Solar Cell Design, Solar Cell Applications.