journal article·2020-12-11

InGaN/Si Double-Junction Photocathode for Unassisted Solar Water Splitting

Srinivas Vanka, Baowen Zhou, Rasha A. Awni, Zhaoning Song, Faqrul A. Chowdhury, Xuedong Liu, Hamed Hajibabaei, Wen Shi, Yixin Xiao, Ishtiaque A. Navid, Ayush Pandey, Rong Chen, Gianluigi A. Botton, Thomas W. Hamann, Dunwei Wang, Yanfa Yan, Zetian Mi

ACS Energy Letters· Volume 5· Issue 12
Publisher page

Abstract

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 ∼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.
Source: openalex_inverted_index · Quality: baseline

Research context

OpenAlex topics: GaN-based semiconductor devices and materials · Ga2O3 and related materials · Semiconductor materials and devices

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Department of Electrical Engineering and Computer Science, University of Michigan, Ann Arbor, 1301 Beal Avenue, Ann Arbor, Michigan 48109, United States

Department of Physics and Astronomy, and Wright Center for Photovoltaics Innovation and Commercialization (PVIC), University of Toledo, Toledo, Ohio 43606, United States

Department of Physics, McGill University, 3600 University Street, Montreal, Québec H3A 2T8, Canada

Department of Engineering Physics, Polytechnique Montreal, 2500 Chemin de Polytechnique Montreal, Montreal, Quebec H3T 1J4, Canada

Facility for Electron Microscopy Research, McGill University, 3640 University Street, Montreal, Quebec H3A 0C7, Canada

Department of Chemistry, Michigan State University, 578 South Shaw Lane, RM 310, East Lansing, Michigan 48824-1322, United States

Department of Materials Science and Engineering, McMaster University, 1280 Main Street West, Hamilton, Ontario L8S 4M1, Canada

Department of Chemistry, Boston College, 2609 Beacon St., Chestnut Hill, Massachusetts 02467, United States

Funding

Office of Energy Efficiency and Renewable Energy

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