First-Principles Calculations of the Phonon-Assisted Optical Absorption and Non-Radiative Loss in Optoelectronic Materials<br><b>Speaker: Manos Kiopakis (UM MSE)</br></b>
Tuesday, September 20, 2011
335 West Hall
Speaker: Manos Kiopakis (UM MSE)Optoelectronic devices, such as solar cells, LEDs, and lasers, have found numerous applications in photovoltaic energy production, lighting, and optical storage. It is thus important to have a good quantitative understanding of the microscopic quantum processes that occur in these devices. First-principles calculations based on density functional theory are a powerful set of computational techniques that can elucidate and predict the properties of carriers in optoelectronic materials. In this talk, I will present the result of first-principles studies of phonon-assisted microscopic mechanisms that define the performance of optoelectronic materials. I will discuss the loss by non-radiative recombination in LED light bulbs, the internal reabsorption of light and loss in green lasers for projectors, and the phonon-assisted optical absorption that enables the operation of silicon solar cells. I will also present research opportunities in my group in the areas of novel photovoltaic and thermoelectric materials for energy applications.