Journal
SEMICONDUCTOR SCIENCE AND TECHNOLOGY
Volume 35, Issue 2, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1361-6641/ab615a
Keywords
photoelectrochemical (PEC) water splitting; InGaN; GaN nanorods; surface plasmon resonance (SPR)
Categories
Funding
- National Key R&D Program of China [2017YFB0403100, 2017YFB0403101, 2017YFB0404101]
- National Nature Science Foundation of China [61674076, 61974062, 61921005, 21875105]
- Nature Science Foundation of Jiangsu Province [BY2013077, BK20141320, BE2015111]
- Collaborative Innovation Center of Solid State Lighting and Energy-saving Electronics
- Fundamental Research Funds for the Central Universities [021014380115, 021014380096]
- Six Talent Peaks Project of Jiangsu Province [XYDXX-081]
- Open Fund of the State Key Laboratory on Integrated Optoelectronics [IOSKL2017KF03]
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It has been extensively focused on the development of photoelectrochemical (PEC) solar water splitting cells due to the urgent need for clean energy. In this study, InGaN/GaN multiple quantum wells (MQWs) nanorods (NRs) PEs are purposely designed with coupled plasmonic metal (Ag-Au core-shell nanowires) for high efficiency PEC water splitting, aiming for enhancing visible light absorption and carrier kinetic energy. By means of self-organized Nickel island patterning and ICP dry etching with proper depths, the photocurrent density of InGaN/GaN nano-photoanodes in NaCl solution can be significantly enhanced from 0.74 mA cm(-2) to 1.4 mA cm(-2) at 1.5 V versus RHE (reversible hydrogen electrode). Furthermore, by decorating plasmonic metal into the InGaN/GaN NR arrays, the PEC water splitting performance can reach a maximum photocurrent of 1.77 mA cm(-2) at 1.5 versus RHE. Such improvement is mainly attributed to the synergistic effects of the visible light absorption of MQWs and the generation of surface plasmon resonance (SPR). The approach of plasmon-enhanced nanostructure with the III-nitride based nano-PEs will accelerate the developments of visible light photocatalysts for PEC solar cells.
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