2019 Graduate Fellows

Joo Yeon (Diana) Roh

Inorganic metal-halide perovskite thin-films doped with rare earth ions, such as ytterbium, have demonstrated great potential as solar absorbers. Increased solar cell sunlight-to-electricity power conversion efficiency (PCE) is the result of their ability to undergo efficient quantum-cutting downconversion, where high-energy photons are converted into lower-energy photons with quantum yields exceeding 100%. My research will involve varying the metal-halide perovskite composition particularly on lead-free alternatives such as tin (non-toxic). Specifically, I will focus on large-area thin-film deposition optimization, time-resolved spectroscopic characterization, and application of these materials on top of commercially available silicon solar cells for enhanced PCE. Much of this work will involve instrumentation at the UW Clean Energy Testbeds. Ultimately, this project will help to advance next-generation photovoltaics aiming to achieve low-cost, high-efficiency solar photoconversion strategies.

Advisor: Daniel Gamelin- 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