Thermoelectric Transport Characteristics of n-type (PbTe)1-x-y(PbS)x(Sb2Se3)y Systems via Stepwise Addition of Dual Components

doi:10.15541/jim20200635

Abstract

Abstract:

PbTe recently attracted extensive attentions as potential candidates for applications at intermediate temperatures. However, it is difficult to significantly improve the thermoelectric performance of n-type PbTe due to its relatively low carrier concentration and complicated band structures. In this study, the stepwise addition of dual components was utilized to verify the possibility for modulating the thermal and electrical transport characteristics of n-type PbTe-based materials. The results indicated that PbS and Sb₂Se₃ can improve the power factor and reduce thermal conductivity of PbTe, respectively. Optimization of band structures and enhancement of phonon scattering were realized by means of expanding band gap, producing point defects and secondary dispersoids. As a result, the merit of figure ZT was remarkably improved. In particular, (PbTe)_0.94(PbS)_0.05(Sb₂Se₃)_0.01 exhibited the highest value of ZT=1.7 at 700 K simultaneously with almost doubled average ZT compared to the pristine PbTe. Accordingly, it seems that the stepwise addition of adequate dual components provides possible technological approach for improving thermoelectric performance of other materials.

Key words: thermoelectric material, n-type PbTe, dual-component, stepwise modulation

CLC Number:

O472

ZHANG Cencen, WANG Xue, PENG Liangming. Thermoelectric Transport Characteristics of n-type (PbTe)_1-_x_-_y(PbS)_x(Sb₂Se₃)_y Systems via Stepwise Addition of Dual Components[J]. Journal of Inorganic Materials, 2021, 36(9): 936-942.

Figures/Tables 8

Table 1 Sample ID, Hall coefficients, carrier concentrations and mobilities at room temperature for (PbTe)1-x-y(PbS)x(Sb2Se3)y

Nominal composition		Sample ID	R_H/(cm³∙C^-1)	n_H/(´10¹⁹, cm^-3)	μ_H/(cm²∙V^-1∙s^-1)
Matrix	PbTe	A	-0.203	3.075	82.691
Dual component	(PbTe)_0.97(PbS)_0.03	AB₃	-0.099	6.319	104.962
	(PbTe)_0.95(PbS)_0.05	AB₅	-0.115	5.918	98.805
	(PbTe)_0.93(PbS)_0.07	AB₇	-0.087	7.223	40.345
Triple component	(PbTe)_0.945(PbS)_0.05(Sb₂Se₃)_0.005	AB₅C_0.5	-0.071	8.752	89.784
	(PbTe)_0.94(PbS)_0.05(Sb₂Se₃)_0.01	AB₅C₁	-0.116	5.406	51.586
	(PbTe)_0.935(PbS)_0.05(Sb₂Se₃)_0.015	AB₅C_1.5	-0.106	5.924	30.806

Fig. 1 XRD patterns of (PbTe)1-x-y(PbS)x(Sb2Se3)y powders

Fig. 2 Lattice parameters a and migration angle Δ2θ of PbTe varied as functions of contents of different components (a) Matrix, dual-component; (b) Triple-component systems

Fig. 3 Thermogravimetric analysis results of (a) AB7 and (b) AB5C1.5 in N2 atmosphere

Fig. 4 Temperature dependences of thermoelectric properties for dual-component samples ABm (a) Electrical conductivity; (b) Seebeck coefficient; (c) Power factor; (d) Total thermal conductivity; (e) Lattice thermal conductivity; (f) ZT

Fig. 5 Temperature dependences of thermoelectric properties for triple-component samples AB5Cn (a) Electrical conductivity; (b) Seebeck coefficient; (c) Power factor; (d) Total thermal conductivity; (e) Lattice thermal conductivity; (f) ZT

Fig. 6 (a) Fractured surfure SEM and (b) back-scattered electron (BSE) images for sample AB5, (c) fractured surfure SEM image, (d) back-scattered electron (BSE) image and (e) EDS mappings for sample AB5C1

Fig. 7 EBSD images of AB5C1 sample (a) Phase; (b) IPF Z; (c) Diffraction band; (d) Pole figure (111)

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Thermoelectric Transport Characteristics of n-type (PbTe)_1-_x_-_y(PbS)_x(Sb₂Se₃)_y Systems via Stepwise Addition of Dual Components

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