Exploring Light-Activated Dynamics in Solar Cell and Photo-Catalytic Materials

Date: 
Monday, January 5, 2015 - 2:00pm to Tuesday, January 6, 2015 - 10:00am
Speaker: 
Dr. Matthias Waegele
Speaker's Institution: 
University of California, Berkeley

Research Interests

Molecular level understanding of heterogeneous catalysis and solar fuels synthesis using transient IR spectroscopy.

Seminars

Monday, January 5, 2pm, 331 Klamath Hall: Research Seminar - "Exploring Light-Activated Dynamics in Solar Cell and Photo-Catalytic Materials"

Tuesday, January 6, 9am, 217 LISB: Future Research Workshop

Title and Abstract

"Exploring Light-Activated Dynamics in Solar Cell and Photo-Catalytic Materials"

 Photoelectrochemical and photovoltaic devices are considered two of the most promising sources of alternative energy. The integration of transition metal oxides into such devices has become increasingly popular as these materials are often chemically stable, earth-abundant, and can be produced at low cost. To design economically viable devices it is essential to gain a better understanding of how the properties of transition metal oxides affect device performance. To this end, we will discuss dynamic processes occurring in and at the surface of transition metal oxide semiconductors. Specifically, we will discuss the first study of the initial photohole transfer at the metal oxide/electrolyte interface under photocatalytic water oxidation conditions. We will further explore the dynamics of photoexcited charges in cobalt oxide, a photovoltaic material. Our discussion will not only highlight the newly discovered physics, but also its technological implications. 

Select Publications

M.M. Waegele, X. Chen, D. Herlihy, T. Cuk, “How surface potential determines the kinetics of the first hole transfer of photocatalytic water oxidation,” J. Amer. Chem. Soc. 136, 10632 (2014).

M.M. Waegele, H.Q. Doan, T. Cuk, “Long-lived photoexcited carrier dynamics in d-d- excitations in Spinel ordered Co3O4,” J. Phys. Chem. C 118, 3426 (2014).

M.M. Waegele, F. Gai, “Infrared study of the folding mechanisms of a helical hairpin: porcine PYY,” Biochemistry 49, 7659 (2010).