Microstructural and thermoelectric properties of PbTe single crystals as grown by Czochralski method

Tosawat Seetawan; Athron Vora-Ud; Fawad Ullah; Phan Bach Thang; Manish Kumar; Hong Joo Kim

doi:10.1016/j.matlet.2022.132798

Microstructural and thermoelectric properties of PbTe single crystals as grown by Czochralski method

Tosawat Seetawan, Athron Vora-Ud, Fawad Ullah, Phan Bach Thang, Manish Kumar, Hong Joo Kim

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Abstract

A single crystal of Lead Telluride (PbTe) has been grown by Czochralski technique. The microstructure of PbTe alloy as grown showed the cubic rock salt (NaCl) structure as confirmed by the XRD and TEM results. The composition of Pb:Te ratio of around 1:1.1 was indicated the Te-rich. The effect of temperature has induced the transport of charges after intrinsic excitation of PbTe to be changed the Seebeck coefficient (S) values of positive (p-type) at low-temperature range (<550 K) to the negative (n-type) at high-temperature range (>550 K). The maximum thermoelectric power factor (PF) of p-type is 1.91 mW m⁻¹ K⁻² at room temperature (RT) and n-type is 0.063 mW m⁻¹ K⁻² at 673 K to be concluded the value of p-type more than n-type around two orders of magnitude. The maximum dimensionless figure of merit (ZT) value is around 0.41 at 300 K.

Original language	English
Article number	132798
Journal	Materials Letters
Volume	324
DOIs	https://doi.org/10.1016/j.matlet.2022.132798
State	Published - 1 Oct 2022

Keywords

Crystal thermoelectric materials
Czochralski technique
Semiconductor materials
Thermoelectric properties

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10.1016/j.matlet.2022.132798

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title = "Microstructural and thermoelectric properties of PbTe single crystals as grown by Czochralski method",

abstract = "A single crystal of Lead Telluride (PbTe) has been grown by Czochralski technique. The microstructure of PbTe alloy as grown showed the cubic rock salt (NaCl) structure as confirmed by the XRD and TEM results. The composition of Pb:Te ratio of around 1:1.1 was indicated the Te-rich. The effect of temperature has induced the transport of charges after intrinsic excitation of PbTe to be changed the Seebeck coefficient (S) values of positive (p-type) at low-temperature range (<550 K) to the negative (n-type) at high-temperature range (>550 K). The maximum thermoelectric power factor (PF) of p-type is 1.91 mW m−1 K−2 at room temperature (RT) and n-type is 0.063 mW m−1 K−2 at 673 K to be concluded the value of p-type more than n-type around two orders of magnitude. The maximum dimensionless figure of merit (ZT) value is around 0.41 at 300 K.",

keywords = "Crystal thermoelectric materials, Czochralski technique, Semiconductor materials, Thermoelectric properties",

author = "Tosawat Seetawan and Athron Vora-Ud and Fawad Ullah and Thang, {Phan Bach} and Manish Kumar and Kim, {Hong Joo}",

note = "Publisher Copyright: {\textcopyright} 2022 Elsevier B.V.",

year = "2022",

month = oct,

day = "1",

doi = "10.1016/j.matlet.2022.132798",

language = "English",

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T1 - Microstructural and thermoelectric properties of PbTe single crystals as grown by Czochralski method

AU - Seetawan, Tosawat

AU - Vora-Ud, Athron

AU - Ullah, Fawad

AU - Thang, Phan Bach

AU - Kumar, Manish

AU - Kim, Hong Joo

PY - 2022/10/1

Y1 - 2022/10/1

N2 - A single crystal of Lead Telluride (PbTe) has been grown by Czochralski technique. The microstructure of PbTe alloy as grown showed the cubic rock salt (NaCl) structure as confirmed by the XRD and TEM results. The composition of Pb:Te ratio of around 1:1.1 was indicated the Te-rich. The effect of temperature has induced the transport of charges after intrinsic excitation of PbTe to be changed the Seebeck coefficient (S) values of positive (p-type) at low-temperature range (<550 K) to the negative (n-type) at high-temperature range (>550 K). The maximum thermoelectric power factor (PF) of p-type is 1.91 mW m−1 K−2 at room temperature (RT) and n-type is 0.063 mW m−1 K−2 at 673 K to be concluded the value of p-type more than n-type around two orders of magnitude. The maximum dimensionless figure of merit (ZT) value is around 0.41 at 300 K.

AB - A single crystal of Lead Telluride (PbTe) has been grown by Czochralski technique. The microstructure of PbTe alloy as grown showed the cubic rock salt (NaCl) structure as confirmed by the XRD and TEM results. The composition of Pb:Te ratio of around 1:1.1 was indicated the Te-rich. The effect of temperature has induced the transport of charges after intrinsic excitation of PbTe to be changed the Seebeck coefficient (S) values of positive (p-type) at low-temperature range (<550 K) to the negative (n-type) at high-temperature range (>550 K). The maximum thermoelectric power factor (PF) of p-type is 1.91 mW m−1 K−2 at room temperature (RT) and n-type is 0.063 mW m−1 K−2 at 673 K to be concluded the value of p-type more than n-type around two orders of magnitude. The maximum dimensionless figure of merit (ZT) value is around 0.41 at 300 K.

KW - Crystal thermoelectric materials

KW - Czochralski technique

KW - Semiconductor materials

KW - Thermoelectric properties

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U2 - 10.1016/j.matlet.2022.132798

DO - 10.1016/j.matlet.2022.132798

M3 - Article

AN - SCOPUS:85133932609

SN - 0167-577X

VL - 324

JO - Materials Letters

JF - Materials Letters

M1 - 132798

ER -

Microstructural and thermoelectric properties of PbTe single crystals as grown by Czochralski method

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Keywords

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