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.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Sep 26, 2016
- Source ID
- 10.1063/1.4963704
Entities
People
- Ankita Katre
- David Broido
- Eric Ou
- Gabriella Coloyan
- Jaehyun Kim
- Jesús Carrete
- Joseph P. Heremans
- Joshua E Goldberger
- Li Shi
- Lucas R. Lindsay
- Matt Heine
- Natalio Mingo
- Nicholas D. Cultrara
- Shishi Jiang
Organizations
- Boston College
- National Science Foundation
- Oak Ridge National Laboratory
- Office of Naval Research
- Ohio State University
- United States Department of Energy
- University of Texas at Austin