Nano particles have created a high interest in recent years by virtue of their unusual mechanical, electrical, optical and magnetic properties and find wide applications in all fields of engineering. This edited volume aims to present the latest trends and updates in nanogenerators, thin film solar cells and green synthesis of metallic nanoparticles with a focus on nanostructured semiconductor devices. Exclusive chapter on electrical transport of nanostructure explains device physics for material properties for reduced dimensions. Additionally, the text describes the functionality of metallic nanoparticles and their application in molecular imaging and optical metamaterials. Piezoelectric nanogenerators has been touched upon from the energy perspective as well.Key Features:* Organized contents on Nanogenerators, VOC sensing, nanoelectronics, and NEMS.* Discusses eco-friendly green synthesis methods for metallic nanoparticles.* Touches upon low power nano devices (e.g. nanogenerators) for energy harvesting with quantum mechanical study.* Thin film/heterojunction based high efficiency solar cell addressed aimed at reducing global energy consumption.