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Defects-free single-crystalline zinc oxide nanostructures for efficient photoelectrochemical solar hydrogen generation

Title
Defects-free single-crystalline zinc oxide nanostructures for efficient photoelectrochemical solar hydrogen generation
Authors
Nandanapalli, Koteeswara ReddyMudusu, DevikaLee, Sungwon
DGIST Authors
Nandanapalli, Koteeswara Reddy; Mudusu, Devika; Lee, Sungwon
Issue Date
2020-10
Citation
International Journal of Hydrogen Energy, 45(51), 27279-27290
Type
Article
Article Type
Article
Author Keywords
Surface passivationMetal-oxide nanostructuresDefects-free ZnO nanorodsLow-temperature growthPhotoelectrochemical catalysisWater-oxidation
Keywords
ATOMIC LAYER DEPOSITIONZNO THIN-FILMSSURFACE PASSIVATIONPLASMA TREATMENTOPTICAL-PROPERTIESWATERNANORODSHETEROSTRUCTURESPERFORMANCEARRAYS
ISSN
0360-3199
Abstract
The article reports a novel and highly efficient methodology for the development of surface defects-free zinc oxide (ZnO) nanostructures, which are highly useful for various optoelectronic and electronic devices. Using this approach, we have developed high-quality ZnO nanostructures with comparable physical and chemical properties to high-temperature grown ones. Initially, ZnO nanostructures were developed by low-temperature chemical bath deposition, and the surface defects passivated structures were obtained by atomic layer deposition of homo-molecular clusters, i.e., Zn and O atomic layers. The surface passivated ZnO nanostructures exhibited excellent chemical stoichiometry between their constituents with enhanced crystalline quality. These nanostructures also showed improved light transmittance in the wavelengths range of 450–1000 nm, and light emission in the ultraviolet region. Further, the surface passivated nanostructures exhibited remarkable device performance as photoanodes with a greatly improved photocurrent density, more than 3 times, and reduced cathodic current of 6.17 × 10−7 A@-0.4 V. Significantly, the light-to-dark current ratio of the PEC devices fabricated with passivated ZnO nanostructures is found to be 1761. © 2020 Hydrogen Energy Publications LLC
URI
http://hdl.handle.net/20.500.11750/12648
DOI
10.1016/j.ijhydene.2020.07.138
Publisher
Elsevier Ltd.
Related Researcher
  • Author Lee, Sungwon Bio-Harmonized Device Lab
  • Research Interests Ultrathin Device Fabrication; Bio sensors Development; Functional Material Development
Files:
There are no files associated with this item.
Collection:
Department of Emerging Materials ScienceBio-Harmonized Device Lab1. Journal Articles


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