<trans-title>Optimization of Thermoelectric Transport Properties of Nb-doped Mo1-xWxSeTe Solid Solutions</trans-title>

Xingyuan ZHOU; Wei LIU; Cheng ZHANG; Fuqiang HUA; Min ZHANG; Xianli SU; Xinfeng TANG

doi:10.15541/jim20200135

Journal of Inorganic Materials, Volume. 35, Issue 12, 1373(2020)

Optimization of Thermoelectric Transport Properties of Nb-doped Mo_1-_xW_xSeTe Solid Solutions

Xingyuan ZHOU... Wei LIU*, Cheng ZHANG, Fuqiang HUA, Min ZHANG, Xianli SU and Xinfeng TANG* |Show fewer author(s)

State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, China

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Figures & Tables(15)

1. XRD patterns of the prepared Mo_1-_xW_xSeTe (0≤x≤0.5) solid solutions

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2. Temperature dependent lattice thermal conductivities of Mo_1-_xW_xSeTe (0≤x≤0.5)

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3. Powder XRD patterns of the prepared Nb₂_yMo_0.5-_yW_0.5-_ySeTe (0≤y≤0.035) solid solutions

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4. Temperature dependence of (a) electrical conductivity s, (b) Seebeck coefficient S and (c) power factor PF of Nb₂_yMo_0.5-_yW_0.5-_ySeTe (0≤y≤0.035) solid solutions with inset in (a) showing the impurity states introduced by the Nb doping.

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5. Pisarenko plots for Nb₂_yMo_0.5-_yW_0.5-_ySeTe (0≤y≤0.035) samples compared with the reported data

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6. Temperature dependent (a) thermal conductivity κ, (b) lattice thermal conductivity κ_L and (c) figure of merit ZT for Nb₂_yMo_0.5-_yW_0.5-_ySeTe (0≤y≤0.035) solid solutions

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S1. Powder XRD patterns of the prepared Mo_1-_xW_xSeTe (x=0.75 and 1)

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$SEM fractured surface morphologies of Mo1-xWxSeTe$

S2. SEM fractured surface morphologies of Mo_1-_xW_xSeTe

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S3. Temperature dependence of (a, d) electrical conductivity σ, (b, e) Seebeck coefficient S, and (c, f) thermal conductivity κ of Mo_1-_xW_xSeTe solid solutions (0≤x≤0.5) measured along the ⊥P and //P directions

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S4. Temperature dependence of (a) electrical conductivity σ, (b) Seebeck coefficient S, (c) power factor PF, (d) thermal conductivity κ, (e) lattice thermal conductivity κ_L and (f) the ZT values of Nb₂_yMo_0.5-_yW_0.5-_ySeTe (0≤y≤0.035) solid solutions measured along the //P direction

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S5. Comparison of thermoelectric properties along ⊥p and //P directions among Nb₂_yMo_0.5-_yW_0.5-_ySeTe solid solutions with y=0.015 and 0.025 as well as Nb_0.05Mo_0.95SeTe and Ta_0.05Mo_0.95Se₂ in the previous reports

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Table 1. 1 Compositions, cell parameters and optical band gaps of Mo_1-_xW_xSeTe (0≤x≤0.5) solid solutions
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Table 1. 1 Compositions, cell parameters and optical band gaps of Mo_1-_xW_xSeTe (0≤x≤0.5) solid solutions
Sample Actual composition Lattice parameters/nm E_g/eV
x=0 MoSe_1.02Te_1.04 a=0.35, c=1.367 1.030
x=0.25 Mo_0.74W_0.25Se_0.9Te_0.96 a=0.3512, c=1.375 1.005
x=0.5 Mo_0.54W_0.46Se_0.93Te_0.94 a=0.3.5, c=1.371 0.998

Table 1. Compositions and transport parameters of Nb₂_yMo_0.5-_yW_0.5-_ySeTe (0≤y≤0.035) solid solutions at room temperature

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Table 1. Compositions and transport parameters of Nb₂_yMo_0.5-_yW_0.5-_ySeTe (0≤y≤0.035) solid solutions at room temperature

Sample	Actual composition	p/(×10²⁰, cm^-3)	μ/(cm²·V^-1·s^-1)		σ/(×10⁴, S·m^-1)		S/(μV·K^-1)
Sample	Actual composition	p/(×10²⁰, cm^-3)	⊥P	//P	⊥P	//P	⊥P	//P
y=0	Mo_0.54W_0.46Se_0.93Te_0.94	0.16	0.79	0.26	0.02	0.01	22.4	42.0
y=0.005	Mo_0.53W_0.47Se_0.99Te_1.09	1.53	1.37	1.32	0.33	0.32	17.2	15.1
y=0.015	Nb_0.03Mo_0.51W_0.46Se_0.93Te_0.96	5.96	2.95	2.52	2.82	2.40	102	93.1
y=0.025	Nb_0.04Mo_0.44W_0.52Se_0.97Te_0.95	6.61	5.45	4.80	5.76	5.07	65.9	70.9
y=0.035	Nb_0.05Mo_0.51W_0.43Se_0.90Te_0.86	7.63	5.72	4.29	6.98	5.24	53.2	52.0

Table 2. 2 LF factors of Mo_1-_xW_xSeTe (0≤x≤0.5) solid solutions
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Table 2. 2 LF factors of Mo_1-_xW_xSeTe (0≤x≤0.5) solid solutions
Sample P₀ P_⊥ LF
x=0 0.31 0.71 0.58
x=0.25 0.30 0.54 0.34
x=0.5 0.29 0.45 0.23

Table 3. 3 Compositions and cell parameters of Nb₂_yMo_0.5-_yW_0.5-_ySeTe (0≤y≤0.035) solid solutions

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Table 3. 3 Compositions and cell parameters of Nb₂_yMo_0.5-_yW_0.5-_ySeTe (0≤y≤0.035) solid solutions

Sample	Actual composition	Lattice parameters/nm
Mo_0.5W_0.5SeTe	Mo_0.54W_0.46Se_0.93Te_0.94	a=0.350, c=1.371
Nb_0.01Mo_0.495W_0.495SeTe	Mo_0.53W_0.47Se_0.99Te_1.09	a=0.351, c=1.371
Nb_0.03Mo_0.485W_0.485SeTe	Nb_0.03Mo_0.51W_0.46Se_0.93Te_0.96	a=0.351, c=1.370
Nb_0.05Mo_0.475W_0.475SeTe	Nb_0.04Mo_0.44W_0.52Se_0.97Te_0.95	a=0.352, c=1.371
Nb_0.07Mo_0.465W_0.465SeTe	Nb_0.05Mo_0.51W_0.43Se_0.90Te_0.86	a=0.352, c=1.371

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Xingyuan ZHOU, Wei LIU, Cheng ZHANG, Fuqiang HUA, Min ZHANG, Xianli SU, Xinfeng TANG. Optimization of Thermoelectric Transport Properties of Nb-doped Mo_1-_xW_xSeTe Solid Solutions[J]. Journal of Inorganic Materials, 2020, 35(12): 1373

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Paper Information

Category: RESEARCH PAPER

Received: Mar. 16, 2020

Accepted: --

Published Online: Mar. 10, 2021

The Author Email: LIU Wei (w.liu@whut.edu.cn), TANG Xinfeng (tangxf@whut.edu.cn)

DOI:10.15541/jim20200135

Topics

laser devices and laser physics

Lasers and Laser Optics

Laser physics

laser manufacturing

Instrumentation, Measurement and Metrology

Table 1. 1 Compositions, cell parameters and optical band gaps of Mo1-xWxSeTe (0≤x≤0.5) solid solutions

Table 1. 1 Compositions, cell parameters and optical band gaps of Mo1-xWxSeTe (0≤x≤0.5) solid solutions

Table 1. Compositions and transport parameters of Nb2yMo0.5-yW0.5-ySeTe (0≤y≤0.035) solid solutions at room temperature

Table 1. Compositions and transport parameters of Nb2yMo0.5-yW0.5-ySeTe (0≤y≤0.035) solid solutions at room temperature

Table 2. 2 LF factors of Mo1-xWxSeTe (0≤x≤0.5) solid solutions

Table 2. 2 LF factors of Mo1-xWxSeTe (0≤x≤0.5) solid solutions

Table 3. 3 Compositions and cell parameters of Nb2yMo0.5-yW0.5-ySeTe (0≤y≤0.035) solid solutions

Table 3. 3 Compositions and cell parameters of Nb2yMo0.5-yW0.5-ySeTe (0≤y≤0.035) solid solutions

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Table 1. 1 Compositions, cell parameters and optical band gaps of Mo_1-_xW_xSeTe (0≤x≤0.5) solid solutions

Table 1. 1 Compositions, cell parameters and optical band gaps of Mo_1-_xW_xSeTe (0≤x≤0.5) solid solutions

Table 1. Compositions and transport parameters of Nb₂_yMo_0.5-_yW_0.5-_ySeTe (0≤y≤0.035) solid solutions at room temperature

Table 1. Compositions and transport parameters of Nb₂_yMo_0.5-_yW_0.5-_ySeTe (0≤y≤0.035) solid solutions at room temperature

Table 2. 2 LF factors of Mo_1-_xW_xSeTe (0≤x≤0.5) solid solutions

Table 2. 2 LF factors of Mo_1-_xW_xSeTe (0≤x≤0.5) solid solutions

Table 3. 3 Compositions and cell parameters of Nb₂_yMo_0.5-_yW_0.5-_ySeTe (0≤y≤0.035) solid solutions

Table 3. 3 Compositions and cell parameters of Nb₂_yMo_0.5-_yW_0.5-_ySeTe (0≤y≤0.035) solid solutions