Physics Department, Zettl Lab
University of California, Berkeley
Novel photovoltaic architectures using two-dimensional atomic layered materials
Location: EB1 Room 1011
Friday, February 6th 2015 - 11:00 am
The novel optoelectronic properties of novel 2D atomic materials are bringing a new range of opportunities to enhance the efficiency of photovoltaic devices. Strong light absorption, high mobility and Fermi level modulation allow for new schemes in photovoltaics. In this talk, Dr. Vazquez-Mena will first present a field-effect solar cell based on a graphene/semiconductor junction with an electrostatically induced and controlled Schottky barrier to optimize photovoltaic conversion. In addition, he will present his current research on hybrid quantum dot/2D optoelectronic devices, complementing the strong light absorption of quantum dots with the high-mobility and Fermi level tuning of graphene. These devices allow for a control response of graphene conductivity exploiting the large carrier photogeneration in the quantum dots. The two approaches presented set fundamental basis for higher photovoltaic devices based on 2D and nanoscale materials.
Dr. Oscar Vazquez-Mena is currently a Postdoctoral Researcher at the University of California, Berkeley in the Physics Department since 2011, and in the recently created Kavli Energy NanoScience Institute. Previously he received his doctoral degree in Microengineering from the Swiss Federal Institute of Technology of Lausanne in 2010. He obtained his M.Sc. degree from Chalmers University of Technology in Sweden in Nanoscale Science and Engineering in 2003, realizing his M.Sc. thesis at Delft University of Technology in the Netherlands. His B.S. degree in Physics Engineering was awarded by the Monterrey Institute of Technology in 2000 in Mexico. Dr. Vazquez-Mena's current research focuses on novel photovoltaic devices based on nanomaterials. His research experience includes scanning probe analysis of proteins, efficient nanopatterning methods, plasmonic biosensors and photovoltaics.