Bryan KUROPATWA est membre de l’équipe TiPi.

Short Introduction

My research is focused around thermoelectric materials; those that are capable of converting a temperature gradient into electricity. The project is approached on several fronts including material design, synthesis, thin film processing, physical property measurements, and measurement instrument design. We are currently interested in n-type (electron mobile) and p-type (hole mobile) polymers as well as the techniques necessary to tune their properties and mobilities nearthat of traditional semiconductors.

Techniques de recherche

Techniques de recherche

  1. Design and implication of Seebeck measurement instrument.
  2. Characterization of materials’thermoelectricproperties.
  3. Synthesis& design of conductivepolymers.
  4. Fabrication &processing of organicthin films.
  5. Solid state crystallography.


With an ever-increasing global demand for energy, every Watt must count. This includes the implication of new, efficient methods of harvesting and reusing energy from green sources. Since the discovery of the Seebeck Effect in 1821, thermoelectric materials have been a subject of great interest for any involved in materials science. These particular materials are capable of converting a temperature gradient into electricity. They are often semiconducting in nature and can be used as a method for cooling (Peltier effect) upon application of a current, or as power generation (Seebeck effect) when a temperature gradient is,  instead,  applied.

In order to be efficient, thermoelectric materials must allow efficient electron flow whilst blocking the parallel flow of heat – phonons. Three physical properties must therefore be considered : the Seebeck Coefficient (S), the entropy per unit charge, is regarded as the voltage change over the applied temperature gradient (S=ΔV/ΔT) ; the electrical conductivity (σ) is the material’s ability to move an electric charge ; and the thermal conductivity (κ), is the material’s ability to move phonons. When combined with the average temperature of an applied gradient, the thermoelectric figure of merit is given as zT = S2σ/κ. All parameters must therefore be optimised and measured before a potential thermoelectric material is considered promising.

Conjugated polymers are comprised of a covalently bonded carbon back bone and conjugated pi-electrons. The pi-electrons form a channel for transport that makes an otherwise insulating material behave like a metal or semiconductor. Polyacetylene is the simplest example of this type of material. Polymers have the advantage over traditional thermoelectric materials such as bismuth telluride (Bi2Te3) because they are light, flexible, transparent, inexpensive, and do not contain heavymetals or rare elements. As thin films or rolls, they can possibly be applied to current technology such as solar cells as well as a separate device. The correct amount of dopant, charge carrier concentration, and therefore S and σ can be chemically optimised for a better zT value. Similarly, improved processing techniques can form better films and polymers with more ordered alignments can optimise σ whilst keeping κ supressed.



LCPO : Laboratoire de Chimie des Polymères Organiques

AMADEus : Advanced MAterials by DEsign

NSERC : Natural Sciences and Engineering Research Council of Canada



  1. Optimization of the Telluride Tl10–xySnxBiyTe6 for Thermoelectric Energy Conversion
    B. A. Kuropatwa, Q. Guo, A. Assoud, H. Kleinke.
    ZAACh.2014, 640, 774-780.
  1. Enhancedthermoelectricproperties of variants of Tl9SbTe6 and Tl9BiTe6
    Q. Guo, M. Chan, B. A. Kuropatwa, H. Kleinke.
    Chem. Mater.2013, 25(20), 4097 – 4104.
  1. Effects of Cation Site Substitutions on the Thermoelectric Performance of LayeredSnBi2Te4utilizing the Triel Elements Ga, In, and Tl
    B. A. Kuropatwa, A. Assoud, H. Kleinke.
    ZAACh.2013, 639, 2411 – 2420.
  1. ThermoelectricProperties of Stoichiometric Compounds in the (SnTe)x(Bi2Te3)y System
    B. A. Kuropatwa, H. Kleinke.
    ZAACh.2012, 638, 2640.
  1. Structures and properties of the ternary thallium chalcogenides Tl2MQ3 (M = Zr, Hf; Q = S, Se)
    C. R. Sankar, B. A. Kuropatwa, A. Assoud, H. Kleinke.
    Dalton Trans.2012, 41 (32), 9646 – 9650.
  1. Crystal Structure and PhysicalProperties of the New One-DimensionalMetal Ba2Cu7–xTe6
    B. A. Kuropatwa, A. Assoud, H. Kleinke.
    Inorg. Chem.2012, 51 (9), 5299 – 5304.
  1. Bariummanganese(II) selenostannate(IV), BaMnSnSe4
    A. Assoud, B. A. Kuropatwa, H. Kleinke.
    Acta Crystallogr.2011, E 67, i72 – i72.
  1. Crystal Structure and PhysicalProperties of the New Chalcogenides Ba3Cu17–x(S,Te)11 and Ba3Cu17–x(S,Te)11.5 withTwoDifferent Cu Clusters
    B. A. Kuropatwa, A. Assoud, H. Kleinke.
    Inorg. Chem.2011, 50 (16), 7831 – 7837.
  1. Phase Range and PhysicalProperties of the Thallium Tin Tellurides Tl10xSnxTe6 (x≤2.2)
    B. A. Kuropatwa, A. Assoud, H. Kleinke.
    J. AlloysCompd.2011, 509, 6768 – 6772.
  1. Crystal Structure and PhysicalProperties of the New Selenide-Tellurides Ba3Cu17x(Se,Te)11.
    B. Kuropatwa, Y. Cui, A. Assoud, H. Kleinke.
    Chem. Mater.2009, 21(1), 88 – 93.
  1. Yb(OTf)3-Catalyzed Reactions of 5-Alkylidene Meldrum’sAcidswithPhenols: One-Pot Assembly of 3,4-Dihydrocoumarins, 4-Chromanones, Coumarins, and Chromones
    E. Fillion, A. Dumas, B. A. Kuropatwa, N. Malhotra, T. Sitler.
    J. Org. Chem. 2006, 71, 409 – 412.
Curriculum vitae

Curriculum vitae


2013 French language, A2 certification, Alliance Française
2012 Ph.D. (Inorganic&MaterialsChemistry)
University of Waterloo
2010, Nov. Certificate of UniversityTeaching
Center for Teaching Excellence, University of Waterloo
2007 B.Sc. HonoursChemistry
University of Waterloo


Awards, Academic Achievements & Scholarships

2014 – Present NSERC Post-Doctoral Fellowship (Canada, Université de Bordeaux)
AMADEus Post-Doctoral Fellowship (Université de Bordeaux)
2010 – 2014 AMADEusPost-DoctoralFellowship (Université de Bordeaux)
W.B. Pearson Medal
in recognition of thesis work (nominee, Oct 2012)
Charles S. Humphrey Graduate Fellowship in Chemistry
NSERC Post Graduate Scholarship Doctoral
Waterloo Institute for Nanotechnology Fellowship
WCRI Scholarship in Cooperative Excellence
U. Waterloo President’s Graduate Scholarship
Science Graduate Experience Award


Selected Technique Experience

X-Ray Diffraction Powder, Single Crystal, Rietveld refinement, Software: Match! (powderanalysis), SHELX, GSAS, Crysfire, X-ray reflectance
SEM / EDX / AFM Sampleprep, loading, theory, general use, spectrumevaluation
PhysicalProperties Seebeck, 4-point method (electricalconductivity), laser flash (thermal) method, DSC/TG, thermoreflectance, ellipsometry
Laboratory Equipment Ballmiller, spin coater, doctorblading, programmable furnaces, glass blowing, glove box, pellet pressing tools, e-beamevaporation
Spectroscopic NMR (Hydrogen/Carbon), Mass, IR, UV-Vis
Calculations/Modeling LMTO band structures, Gaussian

Selected Services  & Memberships


2012 – Present Member American Chemical Society
Canadian Chemical Society
2009 – 2012 Chairman WCRI Board of DirectorsPropertyRedevelopmentTask Force
Waterloo CooperativeResidence Inc.
  Tutor General &InorganicChemistry
  Memberships ChemistryGraduateStudent SocietySwing Dance, Ballroom& Tango SocietiesAmerican Chemical SocietyCanadian Society for Chemistry


Seebeck Effect



Laboratoire Ondes et Matière d’Aquitaine (LOMA)
351 cours de la libération
33405 Talence Cedex

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