This book encompasses the current state-of-art of the green piezoelectric energy harvesting (PEH) technology. It highlights different aspects of PEH starting right from the materials, their synthesis and characterization techniques to applications. Various types of materials including ceramics, polymers, composites, and bio-inspired compounds in nano, micro and meso scale and their recent advancements are captured in detail with special focus on lead-free systems. Different challenges and issues faced while designing a PEH are also included. Features: Guides on how to make piezoelectric energy harvesting in a sustainable manner. Describes related figures of merit for piezoelectric energy harvesting. Covers synthesis of piezoelectric materials in form of bulk, single crystal, nano and thin/thick film. Includes pertinent advanced characterization techniques. Reviews piezo-energy harvesting devices and structures. This book is aimed at researchers, professionals and graduate students in electrical engineering, materials, and energy.