2019 Graduate Fellows

Christine Chang

Atomically-thin two-dimensional (2D) materials are ideal candidates for high-performance solar cell and battery applications due to their favorable physical and optoelectronic properties. Recently, phosphorene—or, 2D black phosphorus—has attracted considerable interest due to its high carrier mobility, direct and tunable bandgap, and structural anisotropy resulting in unique mechanical, optoelectronic, and transport behavior. However, phosphorene is currently limited by both its susceptibility to ambient degradation, leading to amorphous PxOy species, and the lack of known phosphorene doping methods. Through reactions with selective oxidants (including azides, oxygen-atom, and other single-atom transfer reagents), I will develop synthetic protocols to control the passivation and doping of phosphorene nanosheets while preserving their underlying structure and tuning their optoelectronic properties. Our approach, in chemically modifying nanomaterials, further opens an avenue for the precise control of nanostructures and resultant properties, towards ultimately accessing highly stable and performance-optimized photovoltaics and energy storage devices.

Advisor: Alexandra Velian – Chemistry

“Providing clean energy to the inhabitants of our planet is a major challenge to future generations. The University of Washington is to be congratulated for establishing an Institute where faculty and students can work together to tackle the difficult global challenge of energy sustainability.”
– Mildred Dresselhaus, Professor of Physics and Electrical Engineering, Emerita and Institute Professor, Massachusetts Institute of Technology
“Energy competition is opening up in a variety of ways, the push for carbon control will continue, and the rate of technology advancement is exponential. All the things I’ve seen at the CEI are just perfect for the way we see things going in energy. You guys are at the cutting edge. We’re counting on you.”
– Ronald Litzinger, President, Edison Energy