Capturing transiently charged states at the C 60 /TiO 2 (110) interface by time-resolved soft X-ray photoelectron spectroscopy

Ozawa, K.; Yamamoto, Susumu; Yukawa, Ryu; Akikubo, Kazuma; Emori, Masato; Sakama, Hiroshi; Matsuda, Iwao

doi:10.1016/j.orgel.2016.01.020

Cited by 14 publications

(21 citation statements)

References 36 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…46,47 The band gap was successfully determined to be 3.2 eV in the recent study of time-resolved photoelectron spectroscopy (TRPES). 48,49 According to the results of TRPES, TiO 2 bands were shown to bend downwardly from the bulk to the surface. The magnitude of downward band bending ranged from 0 to 0.8 eV, depending on the surface conditions such as surface-specic structures and the density and/or the type of surface defects.…”

Section: Extended Structures Of Vb Edgementioning

confidence: 99%

Influence of electronic structure on visible light photocatalytic activity of nitrogen-doped TiO₂

2017

Self Cite

View full text Add to dashboard Cite

show abstract

Section: Extended Structures Of Vb Edgementioning

confidence: 99%

Influence of electronic structure on visible light photocatalytic activity of nitrogen-doped TiO₂

2017

Self Cite

View full text Add to dashboard Cite

show abstract

“…In this context, it is important to note that the excited electrons have to reside inside the ZnO semiconductor to alter the space-charge balance and the resulting internal potential V bb (z). 17,29,30,33,40,43,44 The combination of the instantaneous dye oxidation described above and the delayed response of ΔE B (Zn 3d) therefore provides clear evidence for a transient retention of the excited charge carriers in ICT states, before their release into the CB, on an overall time scale of ≲1 ns. These findings align with previous observations of delayed charge separation due to the intermediate population of ICT configurations.…”

Section: (A) Delay δT = 2 Ns) Consists Of Two C O N T R I B U T I O N...mentioning

confidence: 84%

“…Closer inspection of the early time dynamics reveals a delayed rise of the ZnO-related trXPS signals compared to Δ E N3 ; see the inset in Figure (a). In this context, it is important to note that the excited electrons have to reside inside the ZnO semiconductor to alter the space-charge balance and the resulting internal potential V bb ( z ). ,,,,,, The combination of the instantaneous dye oxidation described above and the delayed response of Δ E B (Zn 3d) therefore provides clear evidence for a transient retention of the excited charge carriers in ICT states, before their release into the CB, on an overall time scale of ≲1 ns. These findings align with previous observations of delayed charge separation due to the intermediate population of ICT configurations. ,,, Within this framework, Δ E B (Zn 3d) and (Δ E B (C 1s) – Δ E N3 ) are solely governed by the time-dependent electron population in the CB of ZnO, P CB ( t ), whereas Δ E N3 is defined by the net hole population in the N3 monolayer.…”

mentioning

confidence: 99%

Nanoscale Confinement of Photo-Injected Electrons at Hybrid Interfaces

Neppl

Mahl

Roth

et al. 2021

J. Phys. Chem. Lett.

View full text Add to dashboard Cite

A prerequisite for advancing hybrid solar light harvesting systems is a comprehensive understanding of the spatio-temporal dynamics of photo-induced interfacial charge separation.Here, we demonstrate access to this transient charge redistribution for a model hybrid system of nanoporous zinc oxide (ZnO) and ruthenium bipyridyl chromophores. The site-selective probing of the molecular electron donor and semiconductor acceptor by time-resolved X-ray photoemission provides direct insight into the depth distribution of the photo-injected electrons and their interaction with the local band structure on a nanometer length-scale. Our results show that these electrons remain localized within less than 6 nm from the interface, due to enhanced downward band-bending by the photo-injected charge carriers. This spatial confinement suggests that light-induced charge generation and transport in nanoscale ZnO photocatalytic devices proceeds predominantly within the defect-rich surface region, which may lead to enhanced surface recombination and explain their lower performance compared to titanium dioxide (TiO2)based systems.TOC GRAPHICS KEYWORDS Interfacial charge transfer; Time-resolved X-ray Photoelectron Spectroscopy; Hybrid light harvesting systems; Band bending;

show abstract

“…Recently, time-resolved XPS core-level photoemission measurements performed on donor/acceptor blends of TMC organic molecules and fullerenes [53,54] have shown that the core levels experience binding energy shifts after the systems are excited by a femtosecond optical pump.…”

Section: Thick Films (Intermolecular Interactions Perturb the Dynamics)mentioning

confidence: 99%

Introduction to Electronic Properties and Dynamics of Organic Complexes as Self‐Assembled Monolayers

Pedio¹,

Ressel²

2017

Molecular Self-Assembly in Nanoscience and Nanotechnology

View full text Add to dashboard Cite

Self-assembled monolayers (SAMs) of organic-conjugated transition metal complexes on surfaces is a focus of both device engineering and basic science, since it is a key factor in nearly all important aspects of device performances, including operation voltages, degradation, and efficiency. The huge amount of literature results related to the first monolayer, and reorganization and self-assembling processes are due to the general accepted result that structural and chemical properties of the first monolayer are the key parameters for controlled thin film growth. Optical and magneto-electronic properties are intimately connected, and the accurate determination of electronic levels, excitation, and relaxation dynamics is mandatory for the optimization of electronic, photovoltaic, and opto-electronic devices. Quite a number of electronic states is generated by the interaction of light with complex organic molecules. Time-resolved spectroscopies are a new investigation tool that gives the possibility of correctly addressing their origin and life time. Examples of prototypical systems are presented and discussed. We review on complementary techniques, trying to single out how different approaches are fundamental to fully characterize these complex systems.

show abstract

Capturing transiently charged states at the C 60 /TiO 2 (110) interface by time-resolved soft X-ray photoelectron spectroscopy

Cited by 14 publications

References 36 publications

Influence of electronic structure on visible light photocatalytic activity of nitrogen-doped TiO₂

Influence of electronic structure on visible light photocatalytic activity of nitrogen-doped TiO₂

Nanoscale Confinement of Photo-Injected Electrons at Hybrid Interfaces

Introduction to Electronic Properties and Dynamics of Organic Complexes as Self‐Assembled Monolayers

Contact Info

Product

Resources

About

Capturing transiently charged states at the C 60 /TiO 2 (110) interface by time-resolved soft X-ray photoelectron spectroscopy

Cited by 14 publications

References 36 publications

Influence of electronic structure on visible light photocatalytic activity of nitrogen-doped TiO2

Influence of electronic structure on visible light photocatalytic activity of nitrogen-doped TiO2

Nanoscale Confinement of Photo-Injected Electrons at Hybrid Interfaces

Introduction to Electronic Properties and Dynamics of Organic Complexes as Self‐Assembled Monolayers

Contact Info

Product

Resources

About

Influence of electronic structure on visible light photocatalytic activity of nitrogen-doped TiO₂

Influence of electronic structure on visible light photocatalytic activity of nitrogen-doped TiO₂