Fundamentals of photovoltaic materials

Photovoltaic (PV) materials are at the core of solar energy conversion and permit the transformation of sunlight into electrical power. This chapter provides a thorough summary of the fundamentals of PV materials, such as their composition, functionality, and key characteristics influencing their performance. This chapter starts by providing a summary of the fundamentals of PV physics, like the PV effect, how charge carriers are made, as well as electron–hole separation. It then looks into multiple types of PV materials, like crystalline silicon, thin-film semiconductors, organic photovoltaics (OPVs), and new perovskite solar cells, noting both their strengths and weaknesses. To explain how material properties considerably affect the efficiency of solar cells, a thorough discussion on bandgap, absorption coefficient, carrier mobility, and stability is given. In addition, this research examines how methods of doping, passivation, and nanostructuring assist in improving PV performance. This chapter additionally goes over how PV materials are made, including the primary ways they are fabricated, such as chemical vapor deposition (CVD), sputtering, and solution-based methods. It finally discusses current research trends in PV material development as well as challenges. These challenges include material degradation, efficiency improvements, along sustainability concerns. Prior to the finishing of this chapter, readers will comprehensively acquire a solid foundational comprehension of PV materials, decisively setting the stage for more in-depth explorations into synthesis techniques, device architectures, and increasingly advanced PV technologies in later chapters.