Surface Photovoltage Spectroscopy for the Investigation of Perovskite Oxide Interfaces

2005 ◽  
Vol 902 ◽  
Author(s):  
Elke Beyreuther ◽  
Stefan Grafström ◽  
Christian Thiele ◽  
Kathrin Dörr ◽  
Lukas M. Eng
Keyword(s):  
Photoelectron Spectroscopy ◽  
Perovskite Oxide ◽  
Surface Photovoltage ◽  
Epitaxial Thin Films ◽  
Trap States ◽  
Oxide Interfaces ◽  
X Ray ◽  
Surface Photovoltage Spectroscopy ◽  
Prepared State ◽  
Capacitive Method

AbstractIn the present study, we comparatively investigate the distribution of electronic interface states of three different perovskite oxide interfaces, formed by epitaxial thin films of La0.7Sr0.3MnO3 (LSMO), La0.7Ca0.3MnO3 (LCMO), and La0.7Ce0.3MnO3 (LCeMO) on SrTiO3(100) substrates, in the as-prepared state as well as after an annealing procedure. We find that annealing significantly reduces the number and density of interface trap states. Two different experimental realizations of the surface photovoltage spectroscopy (SPS) technique were employed: an approach based on X-ray photoelectron spectroscopy (XPS), as well as a capacitive method. The advantages and limitations of both methods are critically discussed.

Photocatalytic Reduction of CO2 over CdxZn1-xS Photocatalysts

2012 ◽  
Vol 610-613 ◽  
pp. 319-322
Author(s):  
Xue Feng Bai ◽  
Xian Da Li
Keyword(s):  
Hexagonal Phase ◽  
Band Gap Energy ◽  
Photocatalytic Reduction ◽  
Surface Photovoltage ◽  
Mercury Lamp ◽  
X Ray Diffraction ◽  
X Ray ◽  
Gap Energy ◽  
Surface Photovoltage Spectroscopy ◽  
Composite Photocatalysts

A series of CdxZn1-xS (x=0.1~0.9) composite photocatalysts were prepared by coprecipitation method. The above-prepared photocatalysts were characterized by X-ray diffraction (XRD), UV-Vis diffusive reflectance spectroscopy (DRS),surface photovoltage spectroscopy (SPS). It was shown from XRD that CdxZn1-xS solid solution semiconductors were of hexagonal phase in agreement with pure CdS. The DRS and SPS results showed that the band gap energy gradually reduced with the increasing of x value in CdxZn1-xS, and when x = 0.7, the Cd0.7Zn0.3S photocatalyst had the strongest surface photovoltage. It was found from photocatalytic reduction of CO2 that the highest HCOOH production rate of 342.64 μmol/(g•h) over Cd0.7Zn0.3S photocatalyst among a series of CdxZn1-xS photocatalysts were obtained under 250 W high pressure mercury lamp.

Hard X-ray photoelectron spectroscopy of LixNi1−xO epitaxial thin films with a high lithium content

2014 ◽  
Vol 141 (4) ◽  
pp. 044718 ◽  
Author(s):  
L. S. R. Kumara ◽  
Osami Sakata ◽  
Anli Yang ◽  
Ryosuke Yamauchi ◽  
Munetaka Taguchi ◽  
...  
Keyword(s):  
Thin Films ◽  
Photoelectron Spectroscopy ◽  
Lithium Content ◽  
Epitaxial Thin Films ◽  
X Ray

Characterization of Highly Luminescent LaPO4:Eu3+/LaPO4 One-Dimensional Core/Shell Heterostructures

2008 ◽  
Vol 8 (3) ◽  
pp. 1266-1271 ◽  
Author(s):  
Wenbo Bu ◽  
Jianlin Shi
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Photoelectron Spectroscopy ◽  
Core Shell ◽  
Trap States ◽  
Hydrothermal Conditions ◽  
One Dimensional ◽  
X Ray ◽  
Luminescence Efficiency ◽  
Transmission Electron

Highly luminescent LaPO4:Eu3+/LaPO4 one-dimensional (1D) core/shell heterostructures were successfully synthesized by a mild and simple self-aggregation process under refluxing or hydrothermal conditions. The resulting 1D core/shell heterostructures were characterized using a variety of techniques including X-ray diffraction (XRD), transmission electron microscopy (TEM), high-resolution transmission electron microscopy (HRTEM), selected area electron diffraction (SAED), and X-ray photoelectron spectroscopy (XPS) to demonstrate successful coating by the crystalline LaPO4. In addition, a possible formation mechanism for this core/shell heterostructure was proposed. Finally, the photoluminescence property of the LaPO4:Eu3+/LaPO4 1D core/shell heterostructures was investigated in detail, which illustrates that the core/shell heterostructures remarkably increase the luminescence efficiency because the LaPO4 shells effectively eliminate surface trap-states and suppress the energy quenching in the energy-transfer processes.

Synthesis and characteristics of ZnS/CdS composite nanocrystals in block copolymer micelle

1999 ◽  
Vol 14 (6) ◽  
pp. 2381-2384 ◽  
Author(s):  
Dayang Wang ◽  
Yaan Cao ◽  
Xintong Zhang ◽  
Xinming Qian ◽  
Xin Ai ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Block Copolymer ◽  
Elemental Analysis ◽  
Surface Photovoltage ◽  
X Ray Diffraction ◽  
X Ray ◽  
Surface Photovoltage Spectroscopy ◽  
Transmission Electron ◽  
Copolymer Micelle

In hydroxylated poly(styrene-b-butadiene-b-styrene) (HO–SBS) micelle, ZnS/CdS composite nanocrystals were prepared by adding Cd2+ ions and Zn2+ ions to the system sequentially. The resulting composites were identified with elemental analysis, transmission electron microscopy, x-ray diffraction, surface photovoltage spectroscopy, and electric field induced surface photovoltage spectroscopy.

Zirconium distribution in solution-derived BaZrO3 - YBa2Cu3O7-δ epitaxial thin films studied by X-ray photoelectron spectroscopy

2019 ◽  
Vol 669 ◽  
pp. 531-536 ◽  
Author(s):  
A. Santoni ◽  
F. Rondino ◽  
L. Piperno ◽  
A. Armenio Angrisani ◽  
V. Pinto ◽  
...  
Keyword(s):  
Thin Films ◽  
Photoelectron Spectroscopy ◽  
Epitaxial Thin Films ◽  
X Ray

Fabrication and Photocatalytic Activity of Ag/Bi2O3

2012 ◽  
Vol 178-181 ◽  
pp. 645-648
Author(s):  
Yan Lu ◽  
Jun Bo Zhong ◽  
Jian Zhang Li ◽  
Wei Hu
Keyword(s):  
Photocatalytic Activity ◽  
Diffuse Reflectance ◽  
Diffuse Reflectance Spectroscopy ◽  
Methyl Orange Solution ◽  
Reflectance Spectroscopy ◽  
Surface Photovoltage ◽  
X Ray Diffraction ◽  
X Ray ◽  
Surface Photovoltage Spectroscopy ◽  
Orange Solution

It has been found that the photocatalytic activity of Bi2O3toward the decolorization of Methyl Orange solution can be greatly improved by loading Ag on the surface of Bi2O3using a photodeposition method. The photocatalysts were characterized by X-ray diffraction (XRD), UV-Vis diffuse reflectance spectroscopy and surface photovoltage spectroscopy (SPS), respectively. 0.5%Ag/Bi2O3possesses the best photocatalytic activity.

Synthesis and Surface Photoelectric Properties of a Trinuclear Chromium(III) Complex

2013 ◽  
Vol 275-277 ◽  
pp. 2010-2013 ◽  
Author(s):  
Zhong Feng Shi ◽  
Jia Ming Li ◽  
Yan Zhen Yin ◽  
Li Zhang ◽  
Ni Huang ◽  
...  
Keyword(s):  
Absorption Spectra ◽  
Surface Photovoltage ◽  
Monoclinic Space Group ◽  
X Ray Diffraction ◽  
Surface Electron ◽  
Photoelectric Conversion ◽  
Chlorobenzoic Acid ◽  
X Ray ◽  
Surface Photovoltage Spectroscopy ◽  
Photoelectric Properties

A trinuclear Chromium(III) complex [Cr3(μ3-O)(μ2-PCBA)6(CH3OH)3]NO3∙H2O∙CH3OH (HPCBA = 4-Chlorobenzoic acid) has been synthesized and characterized by single-crystal X-ray diffraction, IR spectra, UV-Vis absorption spectra and elemental analysis, which belongs to monoclinic, space group P21/c with a = 12.443 (3), b = 24.543 (5), c =22.094 (7)Å, α = 90°, β =115.76 (2) °, γ =90°, V = 6077 (3)Å3, Z = 4.The surface electron behavior of the chromium complex has been studied emphatically by surface photovoltage spectroscopy (SPS). Structural analyse indicate that the complex is molecular complex. The result of SPS show that there is positive photovoltage response bands within 300–800 nm, which indicate that it possess obvious photoelectric conversion properties. There was a good correlation between the SPS and UV-Vis absorption spectra.

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