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

Title: Cross-plane Thermoelectric and Thermionic Transport across Au/h-BN/Graphene Heterostructures

Journal Article · · Scientific Reports
 [1];  [2];  [3];  [1];  [1];  [1];  [2]; ORCiD logo [3];  [1]
  1. Univ. of Southern California, Los Angeles, CA (United States)
  2. Singapore Univ. of Technology and Design (SUTD) (Singapore)
  3. Univ. of Texas, Austin, TX (United States)

Here, the thermoelectric voltage generated at an atomically abrupt interface has not been studied exclusively because of the lack of established measurement tools and techniques. Atomically thin 2D materials provide an excellent platform for studying the thermoelectric transport at these interfaces. Here, we report a novel technique and device structure to probe the thermoelectric transport across Au/h-BN/graphene heterostructures. An indium tin oxide (ITO) transparent electrical heater is patterned on top of this heterostructure, enabling Raman spectroscopy and thermometry to be obtained from the graphene top electrode in situ under device operating conditions. Here, an AC voltage V(ω) is applied to the ITO heater and the thermoelectric voltage across the Au/h-BN/graphene heterostructure is measured at 2ω using a lock-in amplifier. We report the Seebeck coefficient for our thermoelectric structure to be –215 μV/K. The Au/graphene/h-BN heterostructures enable us to explore thermoelectric and thermal transport on nanometer length scales in a regime of extremely short length scales. The thermoelectric voltage generated at the graphene/h-BN interface is due to thermionic emission rather than bulk diffusive transport. As such, this should be thought of as an interfacial Seebeck coefficient rather than a Seebeck coefficient of the constituent materials.

Research Organization:
Univ. of Southern California, Los Angeles, CA (United States); Univ. of Texas, Austin, TX (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
FG02-07ER46376; FG02-07ER46377
OSTI ID:
1500109
Journal Information:
Scientific Reports, Vol. 7, Issue 1; ISSN 2045-2322
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 13 works
Citation information provided by
Web of Science

References (31)

Light-emitting diodes by band-structure engineering in van der Waals heterostructures journal February 2015
Dual-Gated MoS 2 /WSe 2 van der Waals Tunnel Diodes and Transistors journal January 2015
Thermal conductance and phonon transmissivity of metal–graphite interfaces journal May 2010
Silicon layer intercalation of centimeter-scale, epitaxially grown monolayer graphene on Ru(0001) journal February 2012
Heterostructure integrated thermionic coolers journal September 1997
Multilayer Thermionic Refrigeration journal May 1998
Gate tunable graphene-silicon Ohmic/Schottky contacts journal November 2012
Thermoelectric transport across graphene/hexagonal boron nitride/graphene heterostructures journal September 2014
All Two-Dimensional, Flexible, Transparent, and Thinnest Thin Film Transistor journal April 2014
Electron Thermionic Emission from Graphene and a Thermionic Energy Converter journal January 2015
Flexible n-type thermoelectric materials by organic intercalation of layered transition metal dichalcogenide TiS2 journal April 2015
Thermal Transport in Suspended and Supported Monolayer Graphene Grown by Chemical Vapor Deposition journal May 2010
Current-Temperature Scaling for a Schottky Interface with Nonparabolic Energy Dispersion journal September 2016
Two-dimensional layered semiconductor/graphene heterostructures for solar photovoltaic applications journal January 2014
Thermal transport in graphene journal August 2012
Field-Effect Transistors Built from All Two-Dimensional Material Components journal May 2014
Reliability of Raman measurements of thermal conductivity of single-layer graphene due to selective electron-phonon coupling: A first-principles study journal March 2016
Field-Effect Tunneling Transistor Based on Vertical Graphene Heterostructures journal February 2012
Multilayer thermionic refrigerator and generator journal May 1998
Optical Generation and Detection of Local Nonequilibrium Phonons in Suspended Graphene journal February 2017
Micro/Nanoscale Spatial Resolution Temperature Probing for the Interfacial Thermal Characterization of Epitaxial Graphene on 4H-SiC journal October 2011
Deterministic transfer of two-dimensional materials by all-dry viscoelastic stamping journal April 2014
Graphene-Silicon Schottky Diodes journal May 2011
Heat Conduction across Monolayer and Few-Layer Graphenes text January 2010
Thermal contact resistance between graphene and silicon dioxide journal October 2009
Heat Conduction across Monolayer and Few-Layer Graphenes journal November 2010
Photovoltaic Effect in an Electrically Tunable van der Waals Heterojunction journal July 2014
Measurement of the thermal conductance of the graphene/SiO2 interface journal November 2010
Calculation of ground-state and optical properties of boron nitrides in the hexagonal, cubic, and wurtzite structures journal October 1991
Thermionic Energy Conversion Based on Graphene van der Waals Heterostructures journal April 2017
Graphene-Silicon Schottky Diodes journal September 2011

Cited By (3)

Measuring nanoscale thermal gradients in suspended MoS 2 with STEM-EELS journal October 2019
Thermionic transport across gold-graphene-WSe 2 van der Waals heterostructures journal November 2019
Theory of thermionic emission from a two-dimensional conductor and its application to a graphene-semiconductor Schottky junction journal April 2018

Figures / Tables (6)