Electron injection dynamics in dye-sensitized semiconductor nanocrystalline films

Furube, Akihiro; Katoh, Ryuzi; Hara, Kohjiro

doi:10.1016/j.surfrep.2014.09.003

Cited by 39 publications

(53 citation statements)

References 218 publications

(431 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…4 Indeed, ample ultrafast-spectroscopy studies have been performed, showing that electron transfer from photoexcited dye to the TiO 2 conduction band occurs within time scales of 100 fs in dye-sensitized solar cells, 5 which is much faster than the excited-state lifetime of dyes. [6][7][8] Interestingly, as a mechanism of electron transfer from plasmonic metals to semiconductors alternative to hot-electron transfer, chemical interface dumping, in which plasmons decay through a direct electron-separation channel at the interface, has been postulated. [9][10][11] A decade ago, we realized the potential of Au NPs to act as electron donors to TiO 2 NPs when in close contact.…”

Section: Introductionmentioning

confidence: 99%

Insight into plasmonic hot-electron transfer and plasmon molecular drive: new dimensions in energy conversion and nanofabrication

2017

Self Cite

View full text Add to dashboard Cite

Localized surface plasmon resonance (LSPR) of plasmonic nanoparticles and nanostructures has attracted wide attention because the nanoparticles exhibit a strong near-field enhancement through interaction with visible light, enabling subwavelength optics and sensing at the single-molecule level. The extremely fast LSPR decays have raised doubts that such nanoparticles have use in photochemistry and energy storage. Recent studies have demonstrated the capability of such plasmonic systems in producing LSPR-induced hot electrons that are useful in energy conversion and storage when combined with electron-accepting semiconductors. Due to the femtosecond timescale, hot-electron transfer is under intense investigation to promote ongoing applications in photovoltaics and photocatalysis. Concurrently, hot-electron decay results in photothermal responses or plasmonic heating. Importantly, this heating has received renewed interest in photothermal manipulation, despite the developments in optical manipulation using optical forces to move and position nanoparticles and molecules guided by plasmonic nanostructures. To realize plasmonic heating-based manipulation, photothermally generated flows, such as thermophoresis, the Marangoni effect and thermal convection, are exploited. Plasmon-enhanced optical tweezers together with plasmon-induced heating show potential as an ultimate bottom-up method for fabricating nanomaterials. We review recent progress in two fascinating areas: solar energy conversion through interfacial electron transfer in gold-semiconductor composite materials and plasmon-induced nanofabrication.

show abstract

Section: Introductionmentioning

confidence: 99%

Insight into plasmonic hot-electron transfer and plasmon molecular drive: new dimensions in energy conversion and nanofabrication

2017

Self Cite

View full text Add to dashboard Cite

show abstract

“…including higher IP and lower EA; 33 in applications, they are also widely used to approximate redox potentials and driving forces to electron transfer. 34,35 In addition, electronic coupling is often estimated based on orbital energy splitting 36 and energies of core electronic orbitals are helpful in the analysis of XPS spectra. 37 We therefore focus on orbital energies in order to optimize collocation points.…”

Section: Introductionmentioning

confidence: 99%

Machine Learning Optimization of the Collocation Point Set for Solving the Kohn–Sham Equation

Kamath

Carrington

et al. 2019

J. Phys. Chem. A

View full text Add to dashboard Cite

The rectangular collocation approach makes it possible to solve the Schrödinger equation with basis functions that do not have amplitude in all regions in which wavefunctions have significant amplitude. Collocation points can be restricted to a small region of space. As no integrals are computed, there are no problems due to discontinuities in the potential, and there is no need to use integrable basis functions. In this paper, we show, for the Kohn-Sham equation, that machine learning can be used to drastically reduce the size of the collocation point set. This is demonstrated by solving the Kohn-Sham equations for CO and H2O. We solve the Kohn-Sham equation on a given effective potential which is a critical part of all DFT calculations, and monitor orbital energies and orbital shapes. We use a combination of Gaussian process regression and a genetic algorithm to reduce the collocation point set size by more than an order of magnitude (from about 51,000 points to 2,000 points) while retaining mHartree accuracy.

show abstract

“…The electrolyte viscosity is not the only parameter that influences the cell performance of a complete DSC device; all parts, interfaces, and interactions together determine the performance . One vital parameter is the energy level alignment of the LUMO state of the excited dye and the conduction band of the semiconductor . The conduction band edge determines the open‐circuit voltage ( V OC ) of the cell, which should be as high as possible.…”

Section: Introductionmentioning

confidence: 99%

Ionic Liquid Induced Band Shift of Titanium Dioxide

Weber

Kirchner

2016

ChemSusChem

View full text Add to dashboard Cite

Ionic liquids (ILs) have become an established option for the use as electrolytes in dye-sensitized solar cells. In the present study, the adsorption of a multitude of different ILs on a TiO2 surface is studied systematically, focusing on the energetic modifications of the semiconductor. The cation was found to generally cause an energetic downward shift of the TiO2 band levels by accepting electron density from the surface, and the anions were observed to function in the opposite direction, raising the energy levels by donating electron density. Both effects counterbalance each other, leaving the desired outcome dependent on the choice of the specific IL, i.e., the choice of the cation/anion combination. The correlation of the band levels with the properties of the IL was successfully achieved. The dipole moment of the adsorbed ionic liquid species showed little to no correlation with the semiconductor energetics, but the charge transfer calculated by radical Voronoi tessellation revealed a high correlation. The current findings contribute to a deeper understanding of the role of the electrolyte in dye-sensitized solar cells, and ILs in general, and help with choosing and tuning of the electrolyte solutions in existing applications.

show abstract

Electron injection dynamics in dye-sensitized semiconductor nanocrystalline films

Cited by 39 publications

References 218 publications

Insight into plasmonic hot-electron transfer and plasmon molecular drive: new dimensions in energy conversion and nanofabrication

Insight into plasmonic hot-electron transfer and plasmon molecular drive: new dimensions in energy conversion and nanofabrication

Machine Learning Optimization of the Collocation Point Set for Solving the Kohn–Sham Equation

Ionic Liquid Induced Band Shift of Titanium Dioxide

Contact Info

Product

Resources

About