Journal
APPLIED PHYSICS LETTERS
Volume 106, Issue 1, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.4905511
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Funding
- National Natural Science Foundation of China [91233109, 11474215]
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
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When a Si photocathode is used in a photoelectrochemical cell for H-2 production, an open nanostructure capable of enhanced light absorption, low surface recombination, and being fully protected by thin protective layer is highly desirable. Here, we explored a highly stable and efficient multi-crystalline (mc) n(+)p silicon photocathode. A pyramid-like surface nanostructure on mc-Si wafer was fulfilled through a two-step metal-catalyzed chemical etching process, and then a n(+)p junction photocathode protected by a thin Al2O3 layer was constructed. The photocathode exhibits a high stability of continuous photoelectrochemical H-2 production for above 100 h after a thin layer of Al2O3 is coated on its surface, and its energy conversion efficiency can be up to 6.8% after Pt loading, due to the lowered surface light reflection, increased surface area and minority carrier life time on the electrode surface. (C) 2015 AIP Publishing LLC.
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