期刊
ACS ENERGY LETTERS
卷 5, 期 12, 页码 3741-3751出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsenergylett.0c01583
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资金
- HydroGEN Advanced Water Splitting Materials Consortium, Energy Materials Network under the U.S. Department of Energy, Office of Energy Efficiency and Renewable Energy, Fuel Cell Technologies Office [DE-EE0008086]
- Canada Foundation for Innovation under the Major Science Initiatives
- Natural Sciences and Engineering Research Council
- McMaster University
Simultaneously achieving efficient and stable operation is a major challenge for developing sustainable and economical solar water-splitting systems. In this work, we demonstrate, for the first time, a monolithically integrated InGaN/Si double-junction photocathode, which can enable relatively efficient and stable unassisted solar water splitting. The device consists of a p-type InGaN top junction, which is monolithically integrated on a bottom Si p-n junction through a dislocation-free n(++)/p(++) InGaN nanowire tunnel junction. With the incorporation of Pt catalysts and a thin Al2O3 surface passivation layer, a solar-to-hydrogen efficiency of similar to 10.3% and stable operation of 100 h was measured in 0.5 M H2SO4 in a two-electrode configuration for unbiased photoelectrochemical water splitting. Significantly, such an efficient and stable water-splitting device is achieved using the two most produced semiconductors, i.e., Si and Ga(In)N, promising large-scale implementation of efficient, stable, and low-cost solar hydrogen production systems.
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