Department of Physics and Applied Physics
University of Massachusetts Lowell, Lowell, MA, 01854
Due to the rapid growth of global economics and population, the energy shortage has becoming a more and more serious problem. Thus, to meet the energy challenges, there are three strategic goals: making energy from sunlight, generating electricity without carbon dioxideemissions and revolutionizing energy efficiency and use. Technology breakthrough is urgently needed to meet these goals, such as energy efficient photonics, and energy efficiency lighting technologies. Nanotechnology has played an important role in various research areas that are
related to energy, devices made with nanostructured materials have shown promising performance, such as nanowire solar cells and nanowire and quantum dot LEDs.
In this context, we have demonstrated the epitaxial growth, characterization and device applications of the self-assembled InGaN nanowires on silicon substrates and InGaAs quantum dots (QDs) by MBE systems. The structural characteristics of the nanostructured materials were studied using atomics force microscope (AFM), scanning electron microscope (SEM) and transmission electron microscope (TEM). Photoluminescence measurements were employed to investigate the optical properties of the materials. Two major applications of the nanomaterials will be presented, white and green InGaN nanowire LEDs for high efficiency solid state lighting and 1.3 μm InAs QD lasers monolithically integrated with passive components.