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Optical resonance and charge transfer behavior of patterned WO3 microdisc arrays

Optical resonance and charge transfer behavior of patterned WO3 microdisc arrays
Jeong, Hye WonChae, Weon-SikSong, BokyungCho, Chang-HeeBaek, Seong-HoPark, YiseulPark, Hyunwoong
DGIST Authors
Cho, Chang-HeeBaek, Seong-Ho; Park, Yiseul
Issue Date
Energy and Environmental Science, 9(10), 3143-3150
Article Type
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
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.
Royal Society of Chemistry
Related Researcher
  • Author Cho, Chang-Hee Nanoscale Optoelectronic Materials Laboratory
  • Research Interests Nanophotonics
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Department of Emerging Materials ScienceNanoscale Optoelectronic Materials Laboratory1. Journal Articles
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