2016
DOI: 10.1063/1.4961884
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Correlation of the plasmon-enhanced photoconductance and photovoltaic properties of core-shell Au@TiO2 network

Abstract: This study reveals the contribution of hot electrons from the excited plasmonic nanoparticles in dye sensitized solar cells (DSSCs) by correlating the photoconductance of a core-shell Au@TiO2 network on a micro-gap electrode and the photovolatic properties of this material as photoanodes in DSSCs. The distinct wavelength dependence of these two devices reveals that the plasmon-excited hot electrons can easily overcome the Schottky barrier at Au/TiO2 interface in the whole visible wavelength range and transfer … Show more

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Cited by 12 publications
(6 citation statements)
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“…Titanium dioxide (TiO 2 ) is one of the most important semiconductor materials that has been applied in various fields including photocatalysis, photovoltaics, sensors, and rechargeable ion batteries. However, the photoactivity of TiO 2 materials is limited by wide-bandgap energy (3.2 eV for anatase and 3.0 eV for rutile) and low quantum yield ( ca . 10%). To enhance the photoactivity efficiency, various strategies have been developed and applied in TiO 2 -based photoactivity materials. In particular, introducing noble-metal nanoparticles, especially gold (Au) nanoparticles, into TiO 2 materials has been demonstrated as an effective method to overcome the limitations. , On the one hand, the presence of noble-metal nanoparticles on semiconductor (TiO 2 ) can capture photogenerated electrons, promoting the electron–hole separation and improving the quantum yield. , On the other hand, the localized surface plasmon resonance (LSPR) effect of metal nanoparticles can enhance the interaction of localized electric fields with a neighboring semiconductor, leading to the facile formation of electron–hole pairs in the near-surface region of the semiconductor. , Recently, Au/TiO 2 nanohybrid materials have attracted significant attention due to the enhanced optical, photocatalytic, and photovoltaic performance. …”
Section: Introductionmentioning
confidence: 99%
“…Titanium dioxide (TiO 2 ) is one of the most important semiconductor materials that has been applied in various fields including photocatalysis, photovoltaics, sensors, and rechargeable ion batteries. However, the photoactivity of TiO 2 materials is limited by wide-bandgap energy (3.2 eV for anatase and 3.0 eV for rutile) and low quantum yield ( ca . 10%). To enhance the photoactivity efficiency, various strategies have been developed and applied in TiO 2 -based photoactivity materials. In particular, introducing noble-metal nanoparticles, especially gold (Au) nanoparticles, into TiO 2 materials has been demonstrated as an effective method to overcome the limitations. , On the one hand, the presence of noble-metal nanoparticles on semiconductor (TiO 2 ) can capture photogenerated electrons, promoting the electron–hole separation and improving the quantum yield. , On the other hand, the localized surface plasmon resonance (LSPR) effect of metal nanoparticles can enhance the interaction of localized electric fields with a neighboring semiconductor, leading to the facile formation of electron–hole pairs in the near-surface region of the semiconductor. , Recently, Au/TiO 2 nanohybrid materials have attracted significant attention due to the enhanced optical, photocatalytic, and photovoltaic performance. …”
Section: Introductionmentioning
confidence: 99%
“…While the mechanisms of the individual systems have been much discussed, [ 59 ] effects arising from the combination of the two systems are entirely unknown that needs to be thoroughly investigated. Another way to mitigate the problem of the insulating ligands on the Au nanoparticles is to coat the Au nanoparticles with a thin TiO 2 shell [ 61 ] before assembling them onto the TiO 2 layer through directive self‐assembly. In such cases, the TiO 2 shells can even be modified with specific photosensitizers to enhance the plasmonic effects.…”
Section: Resultsmentioning
confidence: 99%
“…Note that the 1D lines continue for a few micrometers on both electrodes to ensure that the current is already injected into the strongly coupled system before reaching the active channel. [ 60 ] The active channel is the distance between the source and drain, which in the present case is 350 µm. It is known that plasmons predominantly exhibit radiatively damped oscillations (re‐emission of a photon).…”
Section: Resultsmentioning
confidence: 99%