Bulletin of the American Physical Society
2023 APS March Meeting
Volume 68, Number 3
Las Vegas, Nevada (March 5-10)
Virtual (March 20-22); Time Zone: Pacific Time
Session M45: Energy - Catalysis
8:00 AM–10:24 AM,
Wednesday, March 8, 2023
Room: Room 315
Sponsoring
Unit:
GERA
Chair: Liang An, The Hong Kong Polytechnic University
Abstract: M45.00009 : Continuum Modeling of Metal-Insulator-Semiconductor Photoelectrodes*
9:36 AM–9:48 AM
Presenter:
Alex J King
(University of California, Berkeley)
Authors:
Alex J King
(University of California, Berkeley)
Adam Z Weber
(Lawrence Berkeley National Laboratory)
Alexis T Bell
(University of California, Berkeley)
This talk will present recent continuum modeling efforts to simulate an MIS photoelectrode used for PEC hydrogen evolution. Our simulations have identified how the thickness of the insulator impacts the photovoltage. Specifically, the rise in photovoltage with insulator thickness is a consequence of the reduced electric field at the semiconductor/insulator interface, which increases the electron quasi-Fermi level. Beyond the optimal thickness, the photovoltage decreases due to a large potential drop across the insulator. Sensitivity analyses reveal the optimal band offset between the semiconductor and insulator for high reaction rates. These optimal offsets are then used to identify prospective insulators for next-generation MIS photoelectrodes that exhibit high PEC performance.
*This material is based on work performed by the Liquid Sunlight Alliance, which is supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, Fuels from Sunlight Hub under Award Number DE-SC0021266. AJK acknowledges funding from the National Science Foundation Graduate Research Fellowship under Grant No. DGE 2146752.
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