skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Measuring sub-surface spatially varying thermal conductivity of silicon implanted with krypton

Journal Article · · Journal of Applied Physics
DOI:https://doi.org/10.1063/5.0094876· OSTI ID:1887406

The thermal properties of semiconductors following exposure to ion irradiation are of great interest for the cooling of electronic devices; however, gradients in composition and structure due to irradiation often make the measurement difficult. Furthermore, the nature of spatial variations in thermal resistances due to spatially varying ion irradiation damage is not well understood. In this work, we develop an advancement in the analysis of time-domain thermoreflectance to account for spatially varying thermal conductivity in a material resulting from a spatial distribution of defects. We then use this method to measure the near-surface (≲1 μm) thermal conductivity of silicon wafers irradiated with Kr+ ions, which has an approximate Gaussian distribution centered 260 nm into the sample. Our numerical analysis presented here allows for the spatial gradient of thermal conductivity to be extracted via what is fundamentally a volumetric measurement technique. We validate our findings via transmission electron microscopy, which is able to confirm the spatial variation of the sub-surface silicon structure, and provide additional insight into the local structure resulting from the effects of ion bombardment. Thermal measurements found the ion stopping region to have a nearly 50x reduction in thermal conductivity as compared to pristine silicon, while TEM showed the region was not fully amorphized. Our results suggest this drastic reduction in silicon thermal conductivity is primarily driven by structural defects in crystalline regions along with boundary scattering between amorphous and crystalline regions, with a negligible contribution being due to implanted krypton ions themselves.

Research Organization:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA); US Department of the Navy, Office of Naval Research (ONR); USDOE Office of Science (SC); Alexander von Humboldt Foundation
Grant/Contract Number:
NA0003525; N00014-18-1-2429
OSTI ID:
1887406
Report Number(s):
SAND2022-11270J; 709401; TRN: US2310044
Journal Information:
Journal of Applied Physics, Vol. 132, Issue 7; ISSN 0021-8979
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English

References (55)

Thermal Conductivity of Amorphous Silicon journal May 1996
Amorphization and graphitization of single-crystal diamond — A transmission electron microscopy study journal November 2009
Misconceptions impairing the validity of the stopping power tables in the SRIM library and suggestions for doing better in the future journal August 2016
A meeting with Enrico Fermi journal January 2004
Observation of reduced thermal conductivity in a metal-organic framework due to the presence of adsorbates journal August 2020
Arrest of He bubble growth in Cu–Nb multilayer nanocomposites journal April 2008
Thermal conductivity of epitaxial layers of dilute SiGe alloys journal June 2005
Thermal conductivity of isotopically pure and Ge-doped Si epitaxial layers from 300 to 550 K journal December 2004
Analysis of heat flow in layered structures for time-domain thermoreflectance journal December 2004
Ultrahigh thermal conductivity in isotope-enriched cubic boron nitride journal January 2020
Ion-beam processing of silicon at keV energies: A molecular-dynamics study journal December 1996
Thermoreflectance of metal transducers for time-domain thermoreflectance journal August 2010
Uncertainty analysis of thermoreflectance measurements journal January 2016
SRIM – The stopping and range of ions in matter (2010)
  • Ziegler, James F.; Ziegler, M. D.; Biersack, J. P.
  • Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, Vol. 268, Issue 11-12 https://doi.org/10.1016/j.nimb.2010.02.091
journal June 2010
Probing thermal conductivity of subsurface, amorphous layers in irradiated diamond journal February 2021
The Stopping and Range of Ions in Matter book January 1985
Note on the artefacts in SRIM simulation of sputtering journal May 2018
Thermal conductivity measurements via time-domain thermoreflectance for the characterization of radiation induced damage journal May 2015
Interfacial Defect Vibrations Enhance Thermal Transport in Amorphous Multilayers with Ultrahigh Thermal Boundary Conductance journal September 2018
Invited Article: Micron resolution spatially resolved measurement of heat capacity using dual-frequency time-domain thermoreflectance journal July 2013
Role of Disorder and Anharmonicity in the Thermal Conductivity of Silicon-Germanium Alloys: A First-Principles Study journal January 2011
Phonon transport at interfaces between different phases of silicon and germanium journal January 2017
Isotope scattering of dispersive phonons in Ge journal January 1983
The Channeling of Energetic Atoms in Crystal Lattices journal January 1963
Thermal conductivity measurement from 30 to 750 K: the 3ω method journal February 1990
Epitaxial regrowth of Ne‐ and Kr‐implanted amorphous silicon journal October 1978
Modified effective medium formulation for the thermal conductivity of nanocomposites journal August 2007
Thermal conductivity measurements of non-metals via combined time- and frequency-domain thermoreflectance without a metal film transducer journal September 2016
Damage profile and ion distribution of slow heavy ions in compounds journal May 2009
Enhanced thermoelectric performance of rough silicon nanowires journal January 2008
Reductions in the thermal conductivity of irradiated silicon governed by displacement damage journal October 2021
A steady-state thermoreflectance method to measure thermal conductivity journal February 2019
Scattering of phonons by vacancies journal November 1987
High energy ion implantation journal January 1985
Modification of SRIM-calculated dose and injected ion profiles due to sputtering, injected ion buildup and void swelling
  • Wang, Jing; Toloczko, Mychailo B.; Bailey, Nathan
  • Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, Vol. 387 https://doi.org/10.1016/j.nimb.2016.09.015
journal November 2016
Reduction in thermal conductivity and tunable heat capacity of inorganic/organic hybrid superlattices journal January 2016
Thermal conductance of strongly bonded metal-oxide interfaces journal March 2015
A frequency-domain thermoreflectance method for the characterization of thermal properties journal September 2009
Effects of point defects on thermal and thermoelectric properties of InN journal January 2011
Experimental Investigation of Size Effects on the Thermal Conductivity of Silicon-Germanium Alloy Thin Films journal November 2012
Probing anisotropic heat transport using time-domain thermoreflectance with offset laser spots journal October 2012
Formation of Amorphous Silicon by Ion Bombardment as a Function of Ion, Temperature, and Dose journal March 1972
Upper limit to the thermal penetration depth during modulated heating of multilayer thin films with pulsed and continuous wave lasers: A numerical study journal May 2017
Ion beams in silicon processing and characterization journal May 1997
Understanding the local thermal conductivity evolution of neutron irradiated U3Si2 dispersion fuel via state-of-the-art thermo-reflectance measurements journal December 2021
Ion-beam-induced amorphization and recrystallization in silicon journal December 2004
Ion-beam amorphization of semiconductors: A physical model based on the amorphous pocket population journal August 2005
Thermal conductivity of amorphous silicon thin films journal June 2002
Heat-Transport Mechanisms in Superlattices journal February 2009
Effect of ion irradiation on the thermal conductivity of UO2 and U3O8 epitaxial layers journal November 2013
On the Steady-State Temperature Rise During Laser Heating of Multilayer Thin Films in Optical Pump–Probe Techniques journal February 2018
Orders of magnitude reduction in the thermal conductivity of polycrystalline diamond through carbon, nitrogen, and oxygen ion implantation journal February 2020
Thermal conductivity of individual silicon nanowires journal October 2003
Charge-Induced Disorder Controls the Thermal Conductivity of Entropy-Stabilized Oxides journal October 2018
Anisotropic failure of Fourier theory in time-domain thermoreflectance experiments journal October 2014