Enhanced energy filtering and thermopower from synergetic scatterings of electrons at interface potential barriers (or wells) in semiconductor-based nanocomposites dispersed with metallic particles

2011 ◽  
Vol 110 (12) ◽  
pp. 124308 ◽  
Author(s):  
X. H. Yang ◽  
X. Y. Qin
Keyword(s):  
Metallic Particles ◽  
Potential Barriers ◽  
Energy Filtering ◽  
Interface Potential

Effect of crystal size distribution on thermoelectric performance for Lanthanum-doped strontium titanate bulk material

2015 ◽  
Vol 08 (06) ◽  
pp. 1550070
Author(s):  
Boyu Zhang ◽  
Jun Wang ◽  
Xinba Yaer ◽  
Zhenzhen Huo ◽  
Yin Wu ◽  
...  
Keyword(s):  
Size Distribution ◽  
Strontium Titanate ◽  
Crystal Size ◽  
Bulk Material ◽  
Crystal Size Distribution ◽  
Thermoelectric Performance ◽  
Potential Barriers ◽  
Seebeck Coefficients ◽  
Energy Filtering ◽  
Filtering Effect

Effect of crystal size distribution on thermoelectric performance of Lanthanum-doped strontium titanate ( La - SrTiO 3) ceramics are investigated in this study. Thermoelectric performance measurement, coupled with microstructure studies, shows that the electrical conductivity strongly depends on the crystal size, potential barrier on the grain boundary and porosity. Meantime, because the average potential barriers height are increased along with the reduction of crystal size, the Seebeck coefficients are increased by energy filtering effect at the large number of grain boundaries. As a result, by controlling of crystal size distribution, ZT value of La - SrTiO 3 is improved.

Core–shell nanostructures introduce multiple potential barriers to enhance energy filtering for the improvement of the thermoelectric properties of SnTe

Nanoscale ◽  
2020 ◽  
Vol 12 (3) ◽  
pp. 1904-1911 ◽  
Author(s):  
Zheng Ma ◽  
Chao Wang ◽  
Jingdan Lei ◽  
De Zhang ◽  
Yanqun Chen ◽  
...  
Keyword(s):  
Thermoelectric Properties ◽  
Core Shell ◽  
Potential Barriers ◽  
Energy Filtering ◽  
Shell Nanostructures ◽  
Filtering Effect

BiCuSeO@SnO2 core-shell nanostructures can introduce multiple potential barriers in SnTe to enhance energy filtering effect.

Observation and Characterization of Electric Fields at Grain Boundaries

1994 ◽  
Vol 357 ◽  
Author(s):  
B. D. Huey ◽  
D. A. Bonnell ◽  
D. L. Carroll
Keyword(s):  
Grain Boundaries ◽  
Electric Fields ◽  
Detection Scheme ◽  
Force Microscopy ◽  
Potential Barriers ◽  
Atomic Force ◽  
Interface Potential ◽  
Boundary Chemistry ◽  
Probe Response

AbstractVariations in local electric fields near individual grain boundaries have been observed in TiO2 with an ac, non-contact, atomic force microscopy detection scheme. A lateral, in-plane bias was applied to the sample inducing an electric field gradient. A modified AFM then allowed accurate force and force gradient images of both topography and the electric fields to be measured. The sample-tip separation and bias dependence of the AFM probe response to electrostatic fields are used to derive the relationships that allow quantification of lateral fields. With this technique, observation and quantification of potential barriers and enhancement and depletion widths may be observed, especially as a function of boundary chemistry and orientation. Results are discussed in terms of interface potential barrier models.

Achieving high thermoelectric performance through constructing coherent interfaces and building interface potential barriers in n-type Bi2Te3/Bi2Te2.7Se0.3 nanocomposites

2019 ◽  
Vol 7 (32) ◽  
pp. 19120-19129 ◽  
Author(s):  
Bushra Jabar ◽  
Xiaoying Qin ◽  
Di Li ◽  
Jian Zhang ◽  
Adil Mansoor ◽  
...  
Keyword(s):  
Energy Conversion ◽  
Conversion Efficiency ◽  
Energy Conversion Efficiency ◽  
Thermoelectric Performance ◽  
Potential Barriers ◽  
Interface Potential ◽  
Coherent Interfaces

Through incorporation of isostructural Bi2Te3 nanoinclusions in n-type Bi2Te2.7Se0.3 we achieve unprecedented energy-conversion efficiency η = 10.5% with record high ZTmax = 1.35.

Microdiffraction Patterns of Small Metallic Particles II; Theoretical Analysis

1982 ◽  
Vol 40 ◽  
pp. 668-669
Author(s):  
A. Gómez ◽  
P. Schabes-Retchkiman ◽  
M. José-Yacamán ◽  
T. Ocaña
Keyword(s):  
Experimental Data ◽  
Electron Diffraction ◽  
Theoretical Analysis ◽  
Size Range ◽  
Dynamical Theory ◽  
Metallic Particles ◽  
Splitting Effect

The splitting effect that is observed in microdiffraction pat-terns of small metallic particles in the size range 50-500 Å can be understood using the dynamical theory of electron diffraction for the case of a crystal containing a finite wedge. For the experimental data we refer to part I of this work in these proceedings.

Convergent-beam electron diffraction at high spatial resolution

1992 ◽  
Vol 50 (2) ◽  
pp. 1152-1153 ◽  
Author(s):  
J W Steeds
Keyword(s):  
Electron Diffraction ◽  
High Temperature Superconductors ◽  
Bloch Wave ◽  
Convergent Beam Electron Diffraction ◽  
Beam Electron ◽  
Energy Filtering ◽  
Small Probe ◽  
Transmission Electron ◽  
Electron Microscopes ◽  
Convergent Beam

That the techniques of convergent beam electron diffraction (CBED) are now widely practised is evident, both from the way in which they feature in the sale of new transmission electron microscopes (TEMs) and from the frequency with which the results appear in the literature: new phases of high temperature superconductors is a case in point. The arrival of a new generation of TEMs operating with coherent sources at 200-300kV opens up a number of new possibilities.First, there is the possibility of quantitative work of very high accuracy. The small probe will essentially eliminate thickness or orientation averaging and this, together with efficient energy filtering by a doubly-dispersive electron energy loss spectrometer, will yield results of unsurpassed quality. The Bloch wave formulation of electron diffraction has proved itself an effective and efficient method of interpreting the data. The treatment of absorption in these calculations has recently been improved with the result that <100> HOLZ polarity determinations can now be performed on III-V and II-VI semiconductors.

Trial production of γ-type energy filtering TEM

1995 ◽  
Vol 53 ◽  
pp. 604-605
Author(s):  
Y. Taniguchi ◽  
E. Nakazawa ◽  
S. Taya
Keyword(s):  
Magnetic Energy ◽  
Electron Optics ◽  
Electron Microscopic ◽  
Mass Spectrometers ◽  
Ion Optics ◽  
Energy Filtering ◽  
New Information ◽  
New Type ◽  
Fringing Fields

Imaging energy filters can add new information to electron microscopic images with respect to energy-axis, so-called electron spectroscopic imaging (ESI). Recently, many good results have been reported using this imaging technique. ESI also allows high-contrast observation of unstained biological samples, becoming a trend of the field of morphology. We manufactured a new type of energy filter as a trial production. This energy filter consists of two magnets, and we call γ-filter since the trajectory of electrons shows ‘γ’-shape inside the filter. We evaluated the new energyγ-filter TEM with the γ-filter.Figure 1 shows schematic view of the electron optics of the γ-type energy filter. For the determination of the electron-optics of the γ-type energy filter, we used the TRIO (Third Order Ion Optics) program which has been developed for the design of high resolution mass spectrometers. The TRIO takes the extended fringing fields (EFF) into consideration. EFF makes it difficult to design magnetic energy filters with magnetic sector fields.

SREM observation of the interaction between the in-situ deposited Pd small particles and MgO cleavage surface

1986 ◽  
Vol 44 ◽  
pp. 382-383
Author(s):  
H.-J. Ou
Keyword(s):  
Electron Microscopy ◽  
Small Particle ◽  
Small Particles ◽  
Cleavage Surface ◽  
Metallic Particles ◽  
Microscopy Technique ◽  
Ceramic Surfaces ◽  
Reflection Electron Microscopy ◽  
New Perspective

The understanding of the interactions between the small metallic particles and ceramic surfaces has been studied by many catalyst scientists. We had developed Scanning Reflection Electron Microscopy technique to study surface structure of MgO hulk cleaved surface and the interaction with the small particle of metals. Resolutions of 10Å has shown the periodic array of surface atomic steps on MgO. The SREM observation of the interaction between the metallic particles and the surface may provide a new perspective on such processes.

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