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Title: High Efficiency Si Photocathode Protected by Multifunctional GaN Nanostructures

Journal Article · · Nano Letters

Photoelectrochemical water splitting is a clean and environmentally friendly method for solar hydrogen generation. Its practical application, however, has been limited by the poor stability of semiconductor photoelectrodes. In this work, we demonstrate the use of GaN nanostructures as a multifunctional protection layer for an otherwise unstable, low-performance photocathode. The direct integration of GaN nanostructures on n+-p Si wafer not only protects Si surface from corrosion but also significantly reduces the charge carrier transfer resistance at the semiconductor/liquid junction, leading to long-term stability (>100 h) at a large current density (>35 mA/cm2) under 1 sun illumination. The measured applied bias photon-to-current efficiency of 10.5% is among the highest values ever reported for a Si photocathode. Here given that both Si and GaN are already widely produced in industry, our studies offer a viable path for achieving high-efficiency and highly stable semiconductor photoelectrodes for solar water splitting with proven manufacturability and scalability.

Research Organization:
National Renewable Energy Lab. (NREL), Golden, CO (United States)
Sponsoring Organization:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Sustainable Transportation Office. Hydrogen Fuel Cell Technologies Office
Grant/Contract Number:
AC36-08GO28308
OSTI ID:
1476252
Report Number(s):
NREL/JA-5K00-72535
Journal Information:
Nano Letters, Vol. 18, Issue 10; ISSN 1530-6984
Publisher:
American Chemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 60 works
Citation information provided by
Web of Science

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A GaN:Sn nanoarchitecture integrated on a silicon platform for converting CO 2 to HCOOH by photoelectrocatalysis journal January 2019
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Stable p‐type Cu:CdS 1− x Se x /Pt Thin‐Film Photocathodes with Fully Tunable Bandgap for Scavenger‐Free Photoelectrochemical Water Splitting journal January 2020
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Photodeposition of a conformal metal oxide nanocoating journal January 2019
Synthesis and Properties of InGaN/GaN Multiple Quantum Well Nanowires on Si (111) by Molecular Beam Epitaxy journal April 2020
Nanostructured core–shell metal borides–oxides as highly efficient electrocatalysts for photoelectrochemical water oxidation text January 2020