Silicon

Potential Thermoelectric Material ?

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientific

Abstract

The figure of merit of thermoelectric material is determined by electrical and thermal conductivities and the Seebeck coefficient. Silicon can have relatively high electrical conductivity and Seebeck coefficient but the use of silicon in thermoelectric applications has been plagued be the high thermal conductivity of the lattice, leading to figure of merit values about 0.01 at room temperature. However, silicon, being the major semiconductor material and having extremely well developed processing technology, would be very attractive material also for thermoelectrics. Recently it has been shown that by reducing the dimensions the thermal conductivity can be largely reduced. Thermal conductivity of ~1 W/mK has been reported for silicon nanowires, leading to figure of merit of 0.6 at room temperature.1 Reduction of thermal conductivity by a factor of 20 compared to bulk value has been measured in free-standing silicon membranes with thickness below 10 nm.2,3 These values together with the still high electrical conductivity and Seebeck coefficient suggest that nanoscale silicon structures can provide relatively high figure of merit and prove to be useful for thermoelectrics applications. In this talk we will discuss the performance and potential of silicon membranes in thermoelectric generators and coolers and show that there is indeed promise and room for silicon devices.
Original languageEnglish
Title of host publicationWorkshop report
PublisherCECAM
Publication statusPublished - 2015
MoE publication typeB3 Non-refereed article in conference proceedings
EventCECAM Workshop on Hot nanostructures: thermal transport and radiation at the nanoscale - Mainz, Germany
Duration: 30 Sep 20152 Oct 2015

Conference

ConferenceCECAM Workshop on Hot nanostructures: thermal transport and radiation at the nanoscale
CountryGermany
CityMainz
Period30/09/152/10/15

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thermoelectric materials
silicon
thermal conductivity
figure of merit
Seebeck effect
electrical resistivity
rooms
membranes
thermoelectric generators
coefficients
coolers
nanowires
room temperature

Cite this

@inproceedings{cc4d0bbd32f54179be133d0af0e929e8,
title = "Silicon: Potential Thermoelectric Material ?",
abstract = "The figure of merit of thermoelectric material is determined by electrical and thermal conductivities and the Seebeck coefficient. Silicon can have relatively high electrical conductivity and Seebeck coefficient but the use of silicon in thermoelectric applications has been plagued be the high thermal conductivity of the lattice, leading to figure of merit values about 0.01 at room temperature. However, silicon, being the major semiconductor material and having extremely well developed processing technology, would be very attractive material also for thermoelectrics. Recently it has been shown that by reducing the dimensions the thermal conductivity can be largely reduced. Thermal conductivity of ~1 W/mK has been reported for silicon nanowires, leading to figure of merit of 0.6 at room temperature.1 Reduction of thermal conductivity by a factor of 20 compared to bulk value has been measured in free-standing silicon membranes with thickness below 10 nm.2,3 These values together with the still high electrical conductivity and Seebeck coefficient suggest that nanoscale silicon structures can provide relatively high figure of merit and prove to be useful for thermoelectrics applications. In this talk we will discuss the performance and potential of silicon membranes in thermoelectric generators and coolers and show that there is indeed promise and room for silicon devices.",
author = "Jouni Ahopelto",
year = "2015",
language = "English",
booktitle = "Workshop report",
publisher = "CECAM",
address = "Switzerland",

}

Ahopelto, J 2015, Silicon: Potential Thermoelectric Material ? in Workshop report. CECAM, CECAM Workshop on Hot nanostructures: thermal transport and radiation at the nanoscale, Mainz, Germany, 30/09/15.

Silicon : Potential Thermoelectric Material ? / Ahopelto, Jouni.

Workshop report. CECAM, 2015.

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientific

TY - GEN

T1 - Silicon

T2 - Potential Thermoelectric Material ?

AU - Ahopelto, Jouni

PY - 2015

Y1 - 2015

N2 - The figure of merit of thermoelectric material is determined by electrical and thermal conductivities and the Seebeck coefficient. Silicon can have relatively high electrical conductivity and Seebeck coefficient but the use of silicon in thermoelectric applications has been plagued be the high thermal conductivity of the lattice, leading to figure of merit values about 0.01 at room temperature. However, silicon, being the major semiconductor material and having extremely well developed processing technology, would be very attractive material also for thermoelectrics. Recently it has been shown that by reducing the dimensions the thermal conductivity can be largely reduced. Thermal conductivity of ~1 W/mK has been reported for silicon nanowires, leading to figure of merit of 0.6 at room temperature.1 Reduction of thermal conductivity by a factor of 20 compared to bulk value has been measured in free-standing silicon membranes with thickness below 10 nm.2,3 These values together with the still high electrical conductivity and Seebeck coefficient suggest that nanoscale silicon structures can provide relatively high figure of merit and prove to be useful for thermoelectrics applications. In this talk we will discuss the performance and potential of silicon membranes in thermoelectric generators and coolers and show that there is indeed promise and room for silicon devices.

AB - The figure of merit of thermoelectric material is determined by electrical and thermal conductivities and the Seebeck coefficient. Silicon can have relatively high electrical conductivity and Seebeck coefficient but the use of silicon in thermoelectric applications has been plagued be the high thermal conductivity of the lattice, leading to figure of merit values about 0.01 at room temperature. However, silicon, being the major semiconductor material and having extremely well developed processing technology, would be very attractive material also for thermoelectrics. Recently it has been shown that by reducing the dimensions the thermal conductivity can be largely reduced. Thermal conductivity of ~1 W/mK has been reported for silicon nanowires, leading to figure of merit of 0.6 at room temperature.1 Reduction of thermal conductivity by a factor of 20 compared to bulk value has been measured in free-standing silicon membranes with thickness below 10 nm.2,3 These values together with the still high electrical conductivity and Seebeck coefficient suggest that nanoscale silicon structures can provide relatively high figure of merit and prove to be useful for thermoelectrics applications. In this talk we will discuss the performance and potential of silicon membranes in thermoelectric generators and coolers and show that there is indeed promise and room for silicon devices.

M3 - Conference article in proceedings

BT - Workshop report

PB - CECAM

ER -