Skip to main content
U.S. Department of Energy
Office of Scientific and Technical Information

Unraveling the dislocation core structure at a van der Waals gap in bismuth telluride

Journal Article · · Nature Communications
 [1];  [1];  [1];  [2];  [3]
  1. Sandia National Lab. (SNL-CA), Livermore, CA (United States)
  2. National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States)
  3. George Mason Univ., Fairfax, VA (United States)
Tetradymite-structured chalcogenides such as bismuth telluride (Bi2Te3) are of significant interest for thermoelectric energy conversion and as topological insulators. Dislocations play a critical role during synthesis and processing of such materials and can strongly affect their functional properties. The dislocations among quintuple layers present special interest since their core structure is controlled by the van der Waals interactions between the layers. In this work, using atomic-resolution electron microscopy, we resolve the basal dislocation core structure in Bi2Te3, quantifying the disregistry of the atomic planes across the core. We show that, despite the existence of a stable stacking fault in the basal plane gamma surface, the dislocation core spreading is mainly due to the weak bonding between the layers, which leads to a small energy penalty for layer sliding parallel to the van der Waals gap. Measurements within a semidiscrete variational Peierls-Nabarro model informed by first-principles calculations support our experimental findings.
Research Organization:
Sandia National Laboratories (SNL-CA), Livermore, CA (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
AC04-94AL85000
OSTI ID:
1515203
Report Number(s):
SAND--2019-4139J; 674657
Journal Information:
Nature Communications, Journal Name: Nature Communications Journal Issue: 1 Vol. 10; ISSN 2041-1723
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English

References (69)

Synergistic Compositional-Mechanical-Thermal Effects Leading to a Record High zT in n-Type V 2 VI 3 Alloys Through Progressive Hot Deformation journal July 2018
High-Efficiency Thin-Film Superlattice Thermoelectric Cooler Modules Enabled by Low Resistivity Contacts journal January 2018
Semiempirical GGA-type density functional constructed with a long-range dispersion correction journal January 2006
Ein Vergleich zwischen Bi2Te3 und Bi2Te2S journal February 1939
Dissociated $$ \frac{1}{3}\langle 0\bar{1}11\rangle $$ 1 3 〈 0 1 ¯ 11 〉 dislocations in Bi2Te3 and their relationship to seven-layer Bi3Te4 defects journal January 2014
The crystal structure of Bi2Te3−xSex journal March 1963
Impurity-free, mechanical doping for the reproducible fabrication of the reliable n-type Bi2Te3-based thermoelectric alloys journal May 2018
Anisotropic plastic deformation of single crystals of the MAX phase compound Ti3SiC2 investigated by micropillar compression journal December 2018
van der Waals epitaxy: 2D materials and topological insulators journal December 2017
High thermoelectric performance of Bi-Te alloy: Defect engineering strategy journal September 2016
Interfaces in bulk thermoelectric materials journal August 2009
Rietveld refinement of the semiconducting system Bi2−xFexTe3 from X-ray powder diffraction journal December 2007
The MN+1AXN phases: A new class of solids: Thermodynamically stable nanolaminates journal January 2000
Tuning of Topological Dirac States via Modification of van der Waals Gap in Strained Ultrathin Bi 2 Se 3 Films journal June 2018
Observation of Dislocations in Non-metallic Layer Structures journal February 1960
Tetradymites as thermoelectrics and topological insulators journal September 2017
Superlattice-based thin-film thermoelectric modules with high cooling fluxes journal January 2016
Stacking fault energies and slip in nanocrystalline metals journal May 2004
Dislocation locking versus easy glide in titanium and zirconium journal July 2015
Tuning Dirac states by strain in the topological insulator Bi2Se3 journal March 2014
Effects of Heavy Deformation and Annealing on the Electrical Properties of Bi 2 Te 3 journal August 1962
Structure of the (0001) basal twin boundary in Bi2Te3 journal August 2010
The Peierls-Nabarro model revisited journal October 2000
Intrinsic stacking faults in body-centred cubic crystals journal October 1968
Density functional theory investigations of titanium γ -surfaces and stacking faults journal December 2012
Dependence of equilibrium stacking fault width in fcc metals on the γ -surface journal February 2013
Prediction of Dislocation Cores in Aluminum from Density Functional Theory journal January 2008
High-Thermoelectric Performance of Nanostructured Bismuth Antimony Telluride Bulk Alloys journal May 2008
Thermoelectric and transport properties of nanostructured Bi 2 Te 3 by spark plasma sintering journal February 2011
MINERALS OF THE SYSTEM Bi Te Se S RELATED TO THE TETRADYMITE ARCHETYPE: REVIEW OF CLASSIFICATION AND COMPOSITIONAL VARIATION journal August 2007
Electronic Properties of Dislocations journal October 2015
Discovery (theoretical prediction and experimental observation) of a large-gap topological-insulator class with spin-polarized single-Dirac-cone on the surface text January 2009
Evaluation of van der Waals density functionals for layered materials text January 2017
Van der Waals Density Functional for General Geometries text January 2004
Chemical Composition and Crystal Lattice Defects of Bi2Te3 Peltier Device Structures journal October 2001
Gliding dislocations in Bi 2 Te 3 materials journal January 2009
Thermoelectrics book January 2001
Thermoelectric properties of Bi2Te3-Sb2Te3-Sb2Se3 pseudo-ternary alloys in the temperature range 77 to 300� K journal February 1966
Ein Vergleich zwischen Bi2Te3 und Bi2Te2S journal February 1939
Electronic properties of dislocations journal March 2016
A pattern recognition technique for the analysis of grain boundary structure by HREM journal January 1996
Efficiency of ab-initio total energy calculations for metals and semiconductors using a plane-wave basis set journal July 1996
Mechanisms of spiral growth in Bi2Te3 thin films grown by the hot-wall-epitaxy technique journal September 2000
The MN+1AXN phases: A new class of solids: Thermodynamically stable nanolaminates journal January 2000
Texture and thermoelectric properties of hot-extruded Bi2Te3 compound journal January 2000
Improving deformability of Sb 2 Te 3 layered material by dislocation climb at anti-phase boundary journal July 2017
Thin-film thermoelectric devices with high room-temperature figures of merit journal October 2001
On-chip cooling by superlattice-based thin-film thermoelectrics journal January 2009
Observation of a large-gap topological-insulator class with a single Dirac cone on the surface journal May 2009
Stacking faults and the -surface on first-order pyramidal planes in -titanium journal February 2017
Dislocation nets in bismuth and antimony tellurides journal July 1960
Chemical accuracy for the van der Waals density functional journal December 2009
Temperature-dependent stability of stacking faults in Al, Cu and Ni: first-principles analysis journal September 2014
Stacking fault energy of face-centered cubic metals: thermodynamic and ab initio approaches journal August 2016
Self-Consistent Equations Including Exchange and Correlation Effects journal November 1965
From ultrasoft pseudopotentials to the projector augmented-wave method journal January 1999
Generalized-stacking-fault energy surface and dislocation properties of aluminum journal August 2000
Tight-binding calculations of stacking energies and twinnability in fcc metals journal March 2004
Van der Waals density functionals applied to solids journal May 2011
First-principles study of atomic and electronic structures of 60 ∘ perfect and 30 ∘ / 90 ∘ partial glide dislocations in CdTe journal May 2016
Prediction of Dislocation Cores in Aluminum from Density Functional Theory journal January 2008
Efficient Implementation of a van der Waals Density Functional: Application to Double-Wall Carbon Nanotubes journal August 2009
van der Waals Bonding in Layered Compounds from Advanced Density-Functional First-Principles Calculations journal June 2012
Semidiscrete Variational Peierls Framework for Dislocation Core Properties journal June 1997
Van der Waals Density Functional for General Geometries journal June 2004
Evaluation of van der Waals density functionals for layered materials journal March 2018
Colloquium: Topological insulators journal November 2010
Experimental Realization of a Three-Dimensional Topological Insulator, Bi2Te3 journal June 2009
Dense dislocation arrays embedded in grain boundaries for high-performance bulk thermoelectrics journal April 2015

Cited By (2)

Polytypism and Polysomatism in Mixed-Layer Chalcogenides: Characterization of PbBi4Te4S3 and Inferences for Ordered Phases in the Aleksite Series journal October 2019
Tuning of Mg content to enhance the thermoelectric properties in binary Mg 2+ δ Si ( δ = 0, 0.1, 0.15, 0.2) journal November 2019

Figures / Tables (3)


Similar Records