Cited 5 time in webofscience Cited 7 time in scopus

Optical resonance and charge transfer behavior of patterned WO3 microdisc arrays

Title
Optical resonance and charge transfer behavior of patterned WO3 microdisc arrays
Authors
Jeong, HW[Jeong, Hye Won]Chae, WS[Chae, Weon-Sik]Song, B[Song, Bokyung]Cho, CH[Cho, Chang-Hee]Baek, SH[Baek, Seong-Ho]Park, Y[Park, Yiseul]Park, H[Park, Hyunwoong]
DGIST Authors
Song, B[Song, Bokyung]; Cho, CH[Cho, Chang-Hee]; Baek, SH[Baek, Seong-Ho]; Park, Y[Park, Yiseul]
Issue Date
2016
Citation
Energy and Environmental Science, 9(10), 3143-3150
Type
Article
Article Type
Article
Keywords
Charge TransferElectrochemistryElectrodeposition ProcessElectromagnetic Wave AbsorptionEnhanced Light AbsorptionsFinite-Difference Time-Domain SimulationsFinite Difference Time Domain MethodGold DepositsIndium Tin Oxide SubstratesLight AbsorptionLight EmissionPhotoelectrochemical CellsPhotoelectrochemical PropertiesPhysicochemical PropertyQuantum OpticsResonanceResonatorsSubstratesThree-Dimensional AlignmentsTime-Resolved PhotoluminescenceTime Domain AnalysisTin Oxides
ISSN
1754-5692
Abstract
One- to three-dimensional alignments of semiconductors on the micro- or nanoscale have been achieved to tailor their opto-physicochemical properties and improve their photoelectrochemical (PEC) performance. Here, to the best of our knowledge, we report for the first time the fabrication of vertically aligned, well-ordered WO3 microdisc arrays via an electrodeposition process on lithographically patterned indium tin oxide (ITO) substrates as well as their geometry-specific photoelectrochemical properties. The as-fabricated WO3 microdisc arrays exhibit enhanced light absorption as well as facilitated charge separation, leading to significantly higher PEC performance than WO3 films. A finite-difference time-domain simulation of a single WO3 microdisc indicates that strong optical resonances occur particularly in the central part of the microdisc, leading to enhanced optical absorption. A time-resolved photoluminescence study further reveals that the average lifetime of charge carriers (τ) in a microdisc array is shorter than that in a film by ∼60%. The reductively deposited Au particles are localized on the side of the microdisc and ITO substrate, which suggests that the photogenerated electrons are transferred to the same location. In addition, the oxidative deposition of FeOOH particles on the top surface and side of a microdisc indicates hole transfer pathways at the same location. This downward transfer of electrons and upward transfer of holes lead to efficient charge separation, and the radial direction appears to be the most preferred shortcut for the carriers inside the bulk of a microdisc. © 2016 The Royal Society of Chemistry.
URI
http://hdl.handle.net/20.500.11750/2788
DOI
10.1039/c6ee01003b
Publisher
Royal Society of Chemistry
Files:
There are no files associated with this item.
Collection:
Division of Nano∙Energy Convergence Research1. Journal Articles


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