Basal-plane thermal conductivity of nanocrystalline and amorphized thin germanane

Gabriella Coloyan; Nicholas D. Cultrara; Ankita Katre; Jesús Carrete; Matt Heine; Eric Ou; Jaehyun Kim; Shishi Jiang; Lucas Lindsay; Natalio Mingo; David Broido; Joseph P. Heremans; Joshua Goldberger; Li Shi

doi:10.1063/1.4963704

Basal-plane thermal conductivity of nanocrystalline and amorphized thin germanane

Gabriella Coloyan, Nicholas D. Cultrara, Ankita Katre, Jesús Carrete, Matt Heine, Eric Ou, Jaehyun Kim, Shishi Jiang, Lucas Lindsay, Natalio Mingo, David Broido, Joseph P. Heremans, Joshua Goldberger, Li Shi

Materials Theory

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

12 Scopus citations

Abstract

Germanane (GeH), a hydrogen-terminated layered germanium structure, has recently been synthesized. Here, we employed a four-probe thermal transport measurement method to obtain the basal-plane thermal conductivity of thin exfoliated GeH flakes and correlated the measurement results with the crystal structure. The obtained thermal conductivity increases with increasing temperature, suggesting that extrinsic grain boundary and defect scattering dominate over intrinsic phonon-phonon scattering. Annealing a polycrystalline GeH sample at 195 °C caused it to become amorphous, reducing the room-temperature thermal conductivity from 0.53 ± 0.09 W m^-1 K^-1, which is close to the value calculated for 16 nm grain size, to 0.29 ± 0.05 W m^-1 K^-1, which approaches the calculated amorphous limit in the basal plane thermal conductivity.

Original language	English
Article number	131907
Journal	Applied Physics Letters
Volume	109
Issue number	13
DOIs	https://doi.org/10.1063/1.4963704
State	Published - Sep 26 2016

Funding

A. Weathers contributed to the early stage of the experimental works. B. Smith, E. Fleming, and Y. Zhou contributed to the derivation of an analytical solution to the four-probe measurement method of a sample with a finite contact width. The TEM measurements were carried out with the help of M. Palard. The authors thank D. Cahill for critical discussions. This work was primarily supported by National Science Foundation Award No. #1433467. E. Ou was supported by U.S. Department of Energy, Office of Science Award No. # DE-FG02-07ER46377. J. Kim was supported by Office of Naval Research Award No. #N00014-16-1-2293. L. Lindsay acknowledges the support from the U. S. Department of Energy, Office of Science, Office of Basic Energy Sciences, Materials Sciences and Engineering Division. A.K., J.C., and N.M. acknowledge support from the Air Force Office of Scientific Research, USAF under award No. FA9550615-1-0187 DEF, and the European Union's Horizon 2020 Research and Innovation Programme [grant number 645776 (ALMA)].

Funders	Funder number
National Science Foundation
Office of Naval Research	00014-16-1-2293
U.S. Department of Energy
Air Force Office of Scientific Research
Office of Science	DE-FG02-07ER46377
Basic Energy Sciences
U.S. Air Force	FA9550615-1-0187 DEF
Horizon 2020 Framework Programme	1433467
Division of Materials Sciences and Engineering
Horizon 2020	645776

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title = "Basal-plane thermal conductivity of nanocrystalline and amorphized thin germanane",

abstract = "Germanane (GeH), a hydrogen-terminated layered germanium structure, has recently been synthesized. Here, we employed a four-probe thermal transport measurement method to obtain the basal-plane thermal conductivity of thin exfoliated GeH flakes and correlated the measurement results with the crystal structure. The obtained thermal conductivity increases with increasing temperature, suggesting that extrinsic grain boundary and defect scattering dominate over intrinsic phonon-phonon scattering. Annealing a polycrystalline GeH sample at 195 °C caused it to become amorphous, reducing the room-temperature thermal conductivity from 0.53 ± 0.09 W m-1 K-1, which is close to the value calculated for 16 nm grain size, to 0.29 ± 0.05 W m-1 K-1, which approaches the calculated amorphous limit in the basal plane thermal conductivity.",

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AU - Coloyan, Gabriella

AU - Cultrara, Nicholas D.

AU - Katre, Ankita

AU - Carrete, Jesús

AU - Heine, Matt

AU - Ou, Eric

AU - Kim, Jaehyun

AU - Jiang, Shishi

AU - Lindsay, Lucas

AU - Mingo, Natalio

AU - Broido, David

AU - Heremans, Joseph P.

AU - Goldberger, Joshua

AU - Shi, Li

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AB - Germanane (GeH), a hydrogen-terminated layered germanium structure, has recently been synthesized. Here, we employed a four-probe thermal transport measurement method to obtain the basal-plane thermal conductivity of thin exfoliated GeH flakes and correlated the measurement results with the crystal structure. The obtained thermal conductivity increases with increasing temperature, suggesting that extrinsic grain boundary and defect scattering dominate over intrinsic phonon-phonon scattering. Annealing a polycrystalline GeH sample at 195 °C caused it to become amorphous, reducing the room-temperature thermal conductivity from 0.53 ± 0.09 W m-1 K-1, which is close to the value calculated for 16 nm grain size, to 0.29 ± 0.05 W m-1 K-1, which approaches the calculated amorphous limit in the basal plane thermal conductivity.

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Basal-plane thermal conductivity of nanocrystalline and amorphized thin germanane

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