IN-PLANE ENHANCED SEEBECK COEFFICIENT OF ZINC FILMS OBLIQUELY DEPOSITED

2017 ◽  
Vol 24 (07) ◽  
pp. 1750100
Author(s):  
MUSLIM F. JAWAD ◽  
JAAFAR M. MOOSA
Keyword(s):  
Thin Film ◽  
Electrical Conductivity ◽  
Seebeck Coefficient ◽  
Metallic Films ◽  
Oblique Angle ◽  
Polycrystalline Thin Film ◽  
Thermoelectric Figure ◽  
Angle Dependence ◽  
Notable Increase ◽  
Thermoelectric Parameters

In this work, the oblique angle dependence of Seebeck coefficient ([Formula: see text]) on the Zn polycrystalline thin film was demonstrated. The electrical conductivity and Seebeck coefficient are investigated in the temperature range between 25[Formula: see text]C and 100[Formula: see text]C. We observed a notable increase of [Formula: see text] and a decrease in electrical conductivity, and the power factor ([Formula: see text]) increased more than two times at [Formula: see text]. Obliquely deposited metallic films have shown great potential to achieve much higher thermoelectric figure of merits than their normal counterparts. Here, the thermoelectric properties of Zn Polycrystalline crystalline thin film have been investigated. The thickness and deposition angle dependence of its related thermoelectric parameters have been studied.

scholarly journals Enhanced Thermoelectric Properties of WS2/Single-Walled Carbon Nanohorn Nanocomposites

Crystals ◽  
2020 ◽  
Vol 10 (2) ◽  
pp. 140 ◽  
Author(s):  
Ji Hoon Kim ◽  
Seunggun Yu ◽  
Sang Won Lee ◽  
Seung-Yong Lee ◽  
Keun Soo Kim ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Seebeck Coefficient ◽  
Thermoelectric Properties ◽  
High Frequency ◽  
Figure Of Merit ◽  
Thermoelectric Efficiency ◽  
Thermoelectric Figure ◽  
Carbon Nanohorns ◽  
Single Walled Carbon ◽  
High Frequency Induction

Recently, two-dimensional tungsten disulfide (WS2) has attracted attention as a next generation thermoelectric material due to a favorable Seebeck coefficient. However, its thermoelectric efficiency still needs to be improved due to the intrinsically low electrical conductivity of WS2. In the present study, thermoelectric properties of WS2 hybridized with highly conductive single-walled carbon nanohorns (SWCNHs) were investigated. The WS2/SWCNH nanocomposites were fabricated by annealing the mixture of WS2 and SWCNHs using a high-frequency induction heated sintering (HFIHS) system. By adding SWCNHs to WS2, the nanocomposites exhibited increased electrical conductivity and a slightly decreased Seebeck coefficient with the content of SWCNHs. Hence, the maximum power factor of 128.41 μW/mK2 was achieved for WS2/SWCNHs with 0.1 wt.% SWCNHs at 780 K, resulting in a significantly improved thermoelectric figure of merit (zT) value of 0.027 compared to that of pristine WS2 with zT 0.017.

High Temperature Thermoelectric Property of Sr-Filled Skutterudite SryCo4Sb12

2007 ◽  
Vol 336-338 ◽  
pp. 842-845
Author(s):  
Xue Ying Zhao ◽  
Xun Shi ◽  
Li Dong Chen ◽  
Sheng Qiang Bai ◽  
Wen Bing Zhang ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Electrical Conductivity ◽  
Chemical Composition ◽  
Seebeck Coefficient ◽  
Figure Of Merit ◽  
Thermoelectric Figure ◽  
Filled Skutterudite ◽  
Absolute Value ◽  
Homogeneous Chemical ◽  
Type Conduction

Sr-filled skutterudite compounds SryCo4Sb12 (y=0-0.20) were synthesized by melting method. XRD and EPMA results revealed that the obtained samples are single skutterudite phase with homogeneous chemical composition. The lattice parameters increase linearly with increasing Sr content in the range of y=0-0.20. The thermal conductivity, electrical conductivity and Seebeck coefficient were measured in the temperature range of 300-850K. The measurement of Hall effect was performed by Van de Pauw method at room temperature. The obtained Sr-filled skutterudite exhibits n-type conduction. The absolute value of the Seebeck coefficient of SryCo4Sb12 decreases with the increase of Sr content. The electrical conductivity increases with the increase of Sr content. The lattice thermal conductivity of SryCo4Sb12 is significantly depressed as compared with unfilled CoSb3. The maximum dimensionless thermoelectric figure of merit is 0.7 for Sr0.20Co4Sb12 at 850K. Further optimization of chemical composition would improve the thermoelectric performance.

scholarly journals Thermoelectric Lead Telluride with ZnO Nanoparticles

2015 ◽  
Vol 16 (1) ◽  
pp. 62-67
Author(s):  
O. M. Matkivsky
Keyword(s):  
Thermal Conductivity ◽  
Electrical Conductivity ◽  
Seebeck Coefficient ◽  
Figure Of Merit ◽  
Lead Telluride ◽  
Thermoelectric Figure Of Merit ◽  
X Ray Diffraction ◽  
Thermoelectric Figure ◽  
X Ray ◽  
Zno Powder

An X-ray diffraction structural study and measurement of Seebeck coefficient (S), the electrical conductivity (σ) and thermal conductivity (χ) for Lead Telluride with nanoinclusions of ZnO. The calculated value of the specific thermoelectric power (S2σ) and thermoelectric figure of merit (ZT). It was established that the addition of ZnO powder Nanodispersed diameter grains (40-60) nm PbTe reduces the thermal conductivity of the material, and at 0.5 wt.% ZnO to an increase of lead telluride thermoelectric figure of merit to ZT≈1,3.

Ti doping effects on the Seebeck coefficient and electrical conductivity of mesoporous ZnO thin film

2019 ◽  
Vol 235 ◽  
pp. 121757 ◽  
Author(s):  
Min-Hee Hong ◽  
Haryeong Choi ◽  
Younghun Kim ◽  
Taehee Kim ◽  
Hyung Hee Cho ◽  
...  
Keyword(s):  
Thin Film ◽  
Electrical Conductivity ◽  
Seebeck Coefficient ◽  
Zno Thin Film ◽  
Doping Effects ◽  
Mesoporous Zno ◽  
Ti Doping

Carrier Pocket Engineering for the Design of Low Dimensional Thermoelectrics with High Z3DT

2000 ◽  
Vol 626 ◽  
Author(s):  
Takaaki Koga ◽  
Stephen B. Cronin ◽  
Mildred S. Dresselhaus
Keyword(s):  
Thermal Conductivity ◽  
Electrical Conductivity ◽  
Seebeck Coefficient ◽  
Figure Of Merit ◽  
Thermoelectric Figure Of Merit ◽  
Engineering Model ◽  
Thermoelectric Figure ◽  
Model Calculations ◽  
Low Dimensional ◽  
Good Agreement

ABSTRACTThe concept of carrier pocket engineering applied to Si/Ge superlattices is tested experimentally. A set of strain-symmetrized Si(20Å)/Ge(20Å) superlattice samples were grown by MBE and the Seebeck coefficient S, electrical conductivity σ, and Hall coefficient were measured in the temperature range between 4K and 400K for these samples. The experimental results are in good agreement with the carrier pocket engineering model for temperatures below 300K. The thermoelectric figure of merit for the entire superlattice, Z3DT, is estimated from the measured S and σ, and using an estimated value for the thermal conductivity of the superlattice. Based on the measurements of these homogeneously doped samples and on model calculations, including the detailed scattering mechanisms of the samples, projections are made for δ-doped and modulation-doped samples [(001) oriented Si(20Å)/Ge(20Å) superlattices] to yield Z3DT ≈ 0.49 at 300K.

scholarly journals Electrical Conductivity and Thermoelectrical Parameters of Argyrodite-Type Cu7 – xPS6 – xIx Mixed Crystals

2021 ◽  
Vol 66 (2) ◽  
pp. 159
Author(s):  
A.I. Pogodin ◽  
M.M. Luchynets ◽  
M.Y. Filep ◽  
A.A. Kohutych ◽  
T.O. Malakhovska ◽  
...  
Keyword(s):  
Activation Energy ◽  
Electrical Conductivity ◽  
Seebeck Coefficient ◽  
Temperature Interval ◽  
Mixed Crystals ◽  
Frequency Range ◽  
Conductivity Activation Energy ◽  
Direct Crystallization ◽  
Thermoelectric Parameters ◽  
Frequency Temperature

Cu7−xPS6−xIx mixed crystals were grown by the direct crystallization from a melt. The electrical conductivity is measured in the frequency range from 10 Hz to 300 kHz and in the temperature interval 293–383 K. The frequency, temperature, and compositional dependences of the electrical conductivity for Cu7−xPS6−xIx mixed crystals are studied. The measurements of thermoelectric parameters of Cu7−xPS6−xIx mixed crystals are carried out in the temperature interval 293–383 K. The compositional behaviors of the electrical conductivity, activation energy, Seebeck coefficient, and power factor are investigated. The interrelation between the structural, electrical, and thermoelectrical properties is analyzed.

scholarly journals Quantum-Dimensional Effects in Thermoelectric Characteristics of Lead Chalcogenides Nanostructures

2014 ◽  
Vol 1 (1) ◽  
pp. 65-72
Author(s):  
D.M. Freik ◽  
I.K. Yurchyshyn ◽  
V.Yu. Potyak
Keyword(s):  
Experimental Data ◽  
Electrical Conductivity ◽  
Theoretical Model ◽  
Seebeck Coefficient ◽  
Power Factor ◽  
Fermi Energy ◽  
Lead Chalcogenides ◽  
Thermoelectric Power Factor ◽  
Thermoelectric Parameters ◽  
Good Agreement

On the basis of theoretical model of quantum well (QW) with infinitely high walls it was investigated thermoelectric parameters depending on the thickness of the layer of nanostructures IV-VI (PbS, PbSe, PbTe) in the approximation of changing Fermi energy. There have been shown that the dependences of the Seebeck coefficient, electrical conductivity and thermoelectric power factor on well width for lead chalcogenides nanofilms are in good agreement with the experimental data. So, that proves the correctness of used model.

Highly electrical and thermoelectric properties of a PEDOT:PSS thin-film via direct dilution–filtration

RSC Advances ◽  
2015 ◽  
Vol 5 (75) ◽  
pp. 60708-60712 ◽  
Author(s):  
Jinhua Xiong ◽  
Fengxing Jiang ◽  
Weiqiang Zhou ◽  
Congcong Liu ◽  
Jingkun Xu
Keyword(s):  
Thin Film ◽  
Electrical Conductivity ◽  
Organic Solvents ◽  
Thermoelectric Properties ◽  
Figure Of Merit ◽  
Thermoelectric Figure Of Merit ◽  
High Electrical Conductivity ◽  
Thermoelectric Figure

A flexible PEDOT:PSS thin-film achieves a high electrical conductivity (1500 S cm−1) and a high thermoelectric figure of merit (ZT ∼ 0.1) by a rapid direct dilution–filtration with common organic solvents.

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