Silicon-based thermoelectrics made from a boron-doped silicon dioxide nanocomposite

Matthew L. Snedaker; Yichi Zhang; Christina S. Birkel; Heng Wang; Tristan Day; Yifeng Shi; Xiulei Ji; Stephan Kraemer; Carolyn E. Mills; Armin Moosazadeh; Martin Moskovits; G. Jeffrey Snyder; Galen D. Stucky

doi:10.1021/cm401990c

Silicon-based thermoelectrics made from a boron-doped silicon dioxide nanocomposite

Matthew L. Snedaker, Yichi Zhang, Christina S. Birkel, Heng Wang, Tristan Day, Yifeng Shi, Xiulei Ji, Stephan Kraemer, Carolyn E. Mills, Armin Moosazadeh, Martin Moskovits, G. Jeffrey Snyder, Galen D. Stucky

Research output: Contribution to journal › Article › peer-review

21 Scopus citations

Abstract

We report a method for preparing p-type silicon germanium bulk alloys directly from a boron-doped silica germania nanocomposite. This is the first successful attempt to produce and characterize the thermoelectric properties of SiGe-based thermoelectric materials prepared at temperatures below the alloy's melting point through a magnesiothermic reduction of the silica-germania nanocomposite. We observe a thermoelectric power factor that is competitive with the literature record obtained for high energy ball milled nanocomposites. The large grain size in our hot pressed samples limits the thermoelectric figure of merit to 0.5 at 800 C for an optimally doped Si₈₀Ge₂₀ alloy.

Original language	English (US)
Pages (from-to)	4867-4873
Number of pages	7
Journal	Chemistry of Materials
Volume	25
Issue number	24
DOIs	https://doi.org/10.1021/cm401990c
State	Published - Dec 23 2013
Externally published	Yes

Keywords

germania
magnesiothermic reduction
silica
silicon germanium
thermoelectrics

ASJC Scopus subject areas

General Chemistry
General Chemical Engineering
Materials Chemistry

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10.1021/cm401990c

Cite this

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title = "Silicon-based thermoelectrics made from a boron-doped silicon dioxide nanocomposite",

abstract = "We report a method for preparing p-type silicon germanium bulk alloys directly from a boron-doped silica germania nanocomposite. This is the first successful attempt to produce and characterize the thermoelectric properties of SiGe-based thermoelectric materials prepared at temperatures below the alloy's melting point through a magnesiothermic reduction of the silica-germania nanocomposite. We observe a thermoelectric power factor that is competitive with the literature record obtained for high energy ball milled nanocomposites. The large grain size in our hot pressed samples limits the thermoelectric figure of merit to 0.5 at 800 C for an optimally doped Si80Ge20 alloy.",

keywords = "germania, magnesiothermic reduction, silica, silicon germanium, thermoelectrics",

author = "Snedaker, {Matthew L.} and Yichi Zhang and Birkel, {Christina S.} and Heng Wang and Tristan Day and Yifeng Shi and Xiulei Ji and Stephan Kraemer and Mills, {Carolyn E.} and Armin Moosazadeh and Martin Moskovits and Snyder, {G. Jeffrey} and Stucky, {Galen D.}",

year = "2013",

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doi = "10.1021/cm401990c",

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T1 - Silicon-based thermoelectrics made from a boron-doped silicon dioxide nanocomposite

AU - Snedaker, Matthew L.

AU - Zhang, Yichi

AU - Birkel, Christina S.

AU - Wang, Heng

AU - Day, Tristan

AU - Shi, Yifeng

AU - Ji, Xiulei

AU - Kraemer, Stephan

AU - Mills, Carolyn E.

AU - Moosazadeh, Armin

AU - Moskovits, Martin

AU - Snyder, G. Jeffrey

AU - Stucky, Galen D.

PY - 2013/12/23

Y1 - 2013/12/23

N2 - We report a method for preparing p-type silicon germanium bulk alloys directly from a boron-doped silica germania nanocomposite. This is the first successful attempt to produce and characterize the thermoelectric properties of SiGe-based thermoelectric materials prepared at temperatures below the alloy's melting point through a magnesiothermic reduction of the silica-germania nanocomposite. We observe a thermoelectric power factor that is competitive with the literature record obtained for high energy ball milled nanocomposites. The large grain size in our hot pressed samples limits the thermoelectric figure of merit to 0.5 at 800 C for an optimally doped Si80Ge20 alloy.

AB - We report a method for preparing p-type silicon germanium bulk alloys directly from a boron-doped silica germania nanocomposite. This is the first successful attempt to produce and characterize the thermoelectric properties of SiGe-based thermoelectric materials prepared at temperatures below the alloy's melting point through a magnesiothermic reduction of the silica-germania nanocomposite. We observe a thermoelectric power factor that is competitive with the literature record obtained for high energy ball milled nanocomposites. The large grain size in our hot pressed samples limits the thermoelectric figure of merit to 0.5 at 800 C for an optimally doped Si80Ge20 alloy.

KW - germania

KW - magnesiothermic reduction

KW - silica

KW - silicon germanium

KW - thermoelectrics

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JO - Chemistry of Materials

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IS - 24

ER -

Silicon-based thermoelectrics made from a boron-doped silicon dioxide nanocomposite

Abstract

Keywords

ASJC Scopus subject areas

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