Dr Thomas Walther
CPhys, PhD, Dipl-Phys
School of Electrical and Electronic Engineering
Reader in Advanced Electron Microscopy
Semiconductor Materials and Devices Research Group
+44 114 222 5891
Full contact details
School of Electrical and Electronic Engineering
- Profile
-
I received my undergraduate degree in physics from RWTH Aachen in 1993 and my PhD in materials science from the University of Cambridge in 1996/97.
I was a postdoc at CEA Grenoble, Universit茅 d鈥橝ix-Marseille (both in France) and University of Bonn (in Germany) where I later became assistant professor in the chemistry department.
After a short spell at a new research centre where I sat up an electron microscopy lab in the same city, I joined the University of 91直播 as Senior Lecturer in 2006 and was promoted to a readership in 2010.
My research focuses on electron microscopy as a fundamental tool to measure chemical changes at the interfaces between different materials with atomic resolution. This can produce fantastic images that directly show where the atoms are located!
My research is relevant for understanding epitaxial growth processes as well as degradation and failure of semiconductor devices, such as transistors, light-emitting diodes, lasers and solar cells: atoms can sometimes move to lattice positions where they should not be, their agglomeration producing extended lattice defects called dislocations that can multiply and finally lead to device failure.
These studies bridge the gap from fundamental science to applied engineering.
My research involves aspects of electron optics, solid state physics and inorganic chemistry as it combines different experimental methods of high-resolution analytical electron microscopy, based on inelastic electron scattering and X-ray photon generation, with detailed modelling of atomic movements in solids.
Presently, this methodology is expanded into materials for energy conversion and storage, such as electrodes in batteries.
- Qualifications
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- CPhys, Fellow of the Institute of Physics, Fellow of the Royal Microscopical Society
- PhD (Materials Science & Metallurgy), University of Cambridge, 1997
- Dipl.-Phys. (Physics), RWTH Aachen, Germany, 1993
- Research interests
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- Method development for analytical transmission electron microscopy, including energy-dispersive X-ray and electron energy-loss spectroscopy
- Diffusion and segregation measurements in semiconductor nano-structures
- Lattice defects in quantum dots, nano-wires and quantum wells
- Characterization of doping, surface treatments, metal layers for plasmonics and oxides for energy storage applications
- Microstructural characterization of prototype electronic devices, such as photodiodes, field-effect transistors, quantum well, quantum dot or quantum cascade lasers, photovoltaic cells
- Engagement in electron microscopy societies and international conference organisation
- 19th MSM conference:
- 19th MSM conference:
- Publications
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Edited books
- . IOP Publishing.
- 18th International Conference on Microscopy of Semiconducting Materials. Bristol: Institute of Physics Publishing.
- 17th International Conference on Microscopy of Semiconducting Materials. Bristol: IOP Publishing.
- . Bristol: IOP Publishing.
Journal articles
- . Journal of Microscopy, 293.
- . Applied Research, 3(4-5).
- . Applied Physics Letters, 123(10).
- . Nanomaterials, 12(21).
- . Nanomaterials, 12(13).
- . International Journal of Materials Research, 97(7), 934-942.
- . Electronics, 11(1), 48-48.
- . Nanomaterials, 11(8).
- . Semiconductor Science and Technology, 35(12).
- . Nanomaterials, 9(6).
- . Journal of Microscopy, 272(2), 111-122.
- . Materials Science and Technology (United Kingdom), 34(13), 1529-1530.
- . Materials Science and Technology.
- . Nanotechnology, 29(31), 318001-318001.
- . Journal of Microscopy, 268(3), 298-304.
- . J Microsc, 268(3), 221-224.
- . Journal of Microscopy, 268(3), 288-297.
- . Journal of Microscopy, 268(3), 248-253.
- . Applied Physics Letters, 110(22).
- . Journal of Materials Research, 32(5), 983-995.
- . Journal of Materials Research, 32(5), 911-911.
- . MRS Advances, 1(40), 2749-2756.
- . Journal of Microscopy, 262(2), 151-156.
- . Journal of Microscopy, 262(2), 157-166.
- . Journal of Microscopy, 262(2), 131-133.
- . Journal of Microscopy, 260(3), 427-441.
- . Journal of Applied Physics, 118(15), 155301-155301.
- . Semiconductor Science and Technology, 30(11), 114012-114012.
- . Semiconductor Science and Technology, 30(11).
- . physica status solidi (c), 12(3), 310-313.
- . Journal of Microscopy, 257(3), 171-178.
- . Crystal Research and Technology, 50(1), 62-68.
- . Journal of Microscopy, 257(2), 87-91.
- . Crystal Research and Technology, 50(1), 38-42.
- . Journal of Materials Science, 49(11), 3898-3908.
- . Journal of Applied Physics, 115(1).
- Aberration corrected high-resolution transmission and scanning transmission electron microscopy of thin perovskite layers. Physics Procedia, 40, 49-55.
- . Nano Lett, 13(3), 861-865.
- . Journal of Materials Science, 48, 2883-2892.
- The Stranski-Krastanow transition in SiGe epitaxy investigated by scanning transmission electron microscopy. Physica Status Solidi. A: Applications and Materials Science (Print), 210(1), 187-190.
- . Journal of Physics: Conference Series, 371, 011001-011001.
- . Physica Status Solidi (C) Current Topics in Solid State Physics, 9(3-4), 546-549.
- . Physica Status Solidi. C: Current Topics in Solid State Physics, 9(3-4), 1079-1082.
- . Journal of Physics: Conference Series, 326, 011001-011001.
- . IEEE PHOTONIC TECH L, 23(21), 1603-1605.
- . IEEE PHOTONIC TECH L, 23(12), 774-776.
- . Electronics Letters, 47(9), 559-561.
- . 17TH INTERNATIONAL CONFERENCE ON MICROSCOPY OF SEMICONDUCTING MATERIALS 2011, 326.
- . 17TH INTERNATIONAL CONFERENCE ON MICROSCOPY OF SEMICONDUCTING MATERIALS 2011, 326.
- . 17TH INTERNATIONAL CONFERENCE ON MICROSCOPY OF SEMICONDUCTING MATERIALS 2011, 326.
- . 17TH INTERNATIONAL CONFERENCE ON MICROSCOPY OF SEMICONDUCTING MATERIALS 2011, 326.
- Epitaxial growth of relaxed germanium layers by reduced pressure chemical vapour deposition on (110) and (111) silicon substrates. Thin Solid Films.
- . 17TH INTERNATIONAL CONFERENCE ON MICROSCOPY OF SEMICONDUCTING MATERIALS 2011, 326.
- Direct observation by transmission electron microscopy of the influence of Ni catalyst-seeds on the growth of GaN-AlGaN axial heterostructure nanowires. Journal of Crystal Growth.
- . Journal of Physics: Conference Series, 241, 011001-011001.
- . Journal of Physics: Conference Series, 241.
- . Journal of Physics: Conference Series, 241.
- . Journal of Physics: Conference Series, 241.
- . Journal of Physics: Conference Series, 241.
- . Journal of Physics: Conference Series, 241.
- . Journal of Physics: Conference Series, 209.
- . Journal of Physics: Conference Series, 241.
- . Journal of Physics: Conference Series, 209.
- . Journal of Physics: Conference Series, 209.
- . Journal of Physics: Conference Series, 209.
- . Journal of Physics: Conference Series, 209.
- . Ultramicroscopy, 109(10), 1263-1275.
- . APPL PHYS LETT, 92(11).
- . Zeitschrift fur Physikalische Chemie, 221(3), 377-386.
- . International Journal of Materials Research, 97(7), 934-942.
- . The Journal of Physical Chemistry Part B, 110(6), 2549-2554.
- . MAT SCI ENG A-STRUCT, 415(1-2), 304-308.
- . Applied Physics Letters, 88(2), 1-3.
- . Thin Solid Films, 495(1-2), 169-174.
- . Journal of Microscopy, 223(2), 165-170.
- . Journal of Microscopy, 221(2), 137-144.
- . Applied Surface Science, 253(1 SPEC. ISS.), 128-132.
- . Ultramicroscopy, 106(11-12 SPEC. ISS.), 963-969.
- . Microchimica Acta, 155(1-2), 313-318.
- . Microscopy and Microanalysis, 12(6), 498-505.
- . Ultramicroscopy, 104(3-4), 206-219.
- . The Journal of Physical Chemistry Part B, 109(33), 15735-15740.
- . International Journal of Materials Research, 96(5), 429-437.
- . Langmuir, 21(10), 4249-4253.
- . Zeitschrift fuer Metallkunde/Materials Research and Advanced Techniques, 96(5), 429-437.
- . Applied Physics Letters, 84(19), 3882-3884.
- . Interface Science, 12(2-3), 213-226.
- . Interface Science, 12(2-3), 267-275.
- . Journal of Microscopy, 215(2), 191-202.
- . Microscopy and Microanalysis, 9(S03), 286-287.
- . Microscopy and Microanalysis, 9(SUPPL. 3), 268-269.
- . European Journal of Mineralogy, 15(1), 193-205.
- . Ultramicroscopy, 96(3-4), 401-411.
- . Physica Status Solidi (A) Applied Research, 195(1 SPEC), 188-193.
- . Microscopy and Microanalysis, 9(SUPPL. 3), 286-287.
- . Microscopy and Microanalysis, 9(SUPPL. 3), 152-153.
- . Physical Review B - Condensed Matter and Materials Physics, 68(14).
- . Materials Research Society Symposium - Proceedings, 785, 57-64.
- . Microscopy and Microanalysis, 9(SUPPL. 3), 98-99.
- . PHYS REV B, 66(8).
- . PHYS REV B, 65(18).
- . Microscopy and Microanalysis, 7(S2), 290-291.
- . Phys Rev Lett, 86(11), 2381-2384.
- . Journal of the American Ceramic Society, 84(11), 2657-2668.
- . Applied Surface Science, 179(1-4), 213-221.
- Thermal Stability of ZnMgSSe/ZnSe Laser Heterostructures. Physica Status Solidi (A) Applied Research, 185(2), 301-308.
- . Physica B: Condensed Matter, 308-310, 1161-1164.
- The nature of islanding in the InGaAs/GaAs epitaxial system. Materials Research Society Symposium - Proceedings, 648, P1261-P1266.
- Coexistence of clusters, GPB zones, S ''-, S '- and S-phases in an Al-0.9% Cu-1.4% Mg alloy. ACTA MATER, 48(10), 2751-2764.
- Study of sulphur diffusion in ZnMgSSe/ZnSe quantum wells by energy-loss imaging in a transmission electron microscope. Physica Status Solidi (A) Applied Research, 180(1), 351-356.
- . Diffusion and Defect Data. Pt A Defect and Diffusion Forum, 183, 53-60.
- . Philosophical Magazine Letters, 79(1), 31-39.
- . Journal of Crystal Growth, 197(1-2), 113-128.
- . Thin Solid Films, 307(1-2), 6-9.
- Observation of vertical and lateral Ge segregation in thin undulating SiGe layers on Si by electron energy-loss spectroscopy. APPL PHYS LETT, 71(6), 809-811.
- . Defect and Diffusion Forum, 143-147, 1135-1140.
- . PHILOSOPHICAL TRANSACTIONS OF THE ROYAL SOCIETY OF LONDON SERIES A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES, 354(1719), 2709-2711.
- . Physical Review B - Condensed Matter and Materials Physics, 54(22), 16234-16237.
- DETECTION OF RANDOM ALLOY FLUCTUATIONS IN HIGH-RESOLUTION TRANSMISSION ELECTRON-MICROGRAPHS OF A1GAAS. PHILOS MAG A, 72(4), 1015-1030.
- Correlation between compositional fluctuations and surface undulations in strained layer epitaxy. Materials Science Forum, 196-201(pt 1), 505-510.
- . Applied Physics A Solids and Surfaces, 57(5), 393-400.
- . Journal of Physics D: Applied Physics.
- . Journal of Microscopy.
- . Journal of Microscopy.
- . Materials, 16(17), 5761-5761.
- . ACS Applied Nano Materials.
- . Semiconductor Science and Technology.
Chapters
- , Encyclopedia of Materials: Electronics (pp. V3-605-V3-618).
- , Microscopy Methods in Nanomaterials Characterization (pp. 105-134). Elsevier
- In Wang ZM (Ed.), FIB Nanostructures (pp. 299-314). Cham, Switzerland: Springer.
- High Spatial and High Energy Resolution Electron Energy-Loss Spectroscopy in a Transmission Electron Microscope: Fundamentals and Applications to Nanostructured Materials In Festk枚rperforschung FJIF, Urban K, Schneider CM, Bruckel T, Blugel S, Tillmann K, Schweika W, Lentzen M & Baumgarten L (Ed.), Probing the Nanoworld (pp. E1.1-E1.30). Juelich: Forschungszentrum Juelich GmbH.
- Automated EELS core-loss edge detection for quantification of the chemical composition of nano-structured semiconductors In NN (Ed.), Elsevier Encyclopedia of Materials Section 2: Nanoscale Materials for Electronics Elsevier
Conference proceedings papers
- . Journal of Physics: Conference Series, Vol. 1190(1). Thessaloniki, Greece, 24 June 2018 - 29 June 2018.
- (pp 891-892)
- . Journal of Physics: Conference Series, Vol. 644 (pp 012006-012006)
- . http://www.mmc2015.org.uk/ (pp P.4027-P.4027). Manchester, 29 June 2015 - 2 July 2015.
- Determination of indium concentration of InGaN alloys from plasmon spectroscopy. MMC2015, Manchester, UK
- . abstract booklet online(poster #3) (pp 13-13). Coventry, 15 October 2014 - 16 October 2014.
- Nanostructure properties of GaAs/AlGaAs core-shell nanowires. abstract booklet(B-B-II-28). Warsaw, 15 September 2014 - 18 September 2014.
- Morphology and misfit accommodation of InAs quantum dots on non-singular (211)B GaAs surfaces. abstract booklet(B-B-I-15). Warsaw, 15 September 2014 - 18 September 2014.
- Quantitative transmission electron microscopy of high alloy content InGaN deposited by PAMBE: from epilayers to quantum wells. H-2-4(abstract booklet). Warsaw, 15 September 2014 - 18 September 2014.
- Comparison of the silicon/phosphorus ratio in natural and synthetic nagelschmidtite for possible use as standard for microanalysis based on X-ray lines of Si and P. 18th Int. Microscopy Congress (IMC2014), Vol. Instrumentation & Techniques (IT-5-P-3376) (pp 616-617). Prague, 7 September 2014 - 12 September 2014.
- Investigation of the optical properties of silica nano-particles with low refractive index by electron energy-loss spectroscopy. Microscience Microscopy Congress MMC 2014 (pp P1059-P1059). Manchester, 30 June 2014 - 3 July 2014.
- Production of regular quantum dot arrays by focused ion beams. 8th Int. Conf. Quantum Dots (pp 135-135). Pisa, 11 May 2014 - 16 May 2014.
- qHRTEM analysis of the (211)B In(Ga)As QDs/GaAs heterostucture. 18th Int. Microscopy Congress (IMC2014), Vol. Materials Science MS-1-P-2977 (pp 2340-2341). Prague, 7 September 2014 - 12 September 2014.
- Strain relaxation of high-In content InGaN epilayers grown by PAMBE. 18th Int. Microscopy Congress (IMC2014), Vol. MS-14-O-2233 (pp 3714-3715). Prague, 7 September 2014 - 12 September 2014.
- Approaches for quantifying hyperspectral images of interfaces in analytical scanning transmission electron microscopy. Int. Conf. on Electron Microscopy & 35th Annual Meeting of EMSI (pp 63-64). Delhi, 9 July 2014 - 11 July 2014.
- Core-shell GaAs/AlGaAs nanowires grown on Si(111). 18th Int. Microscopy Congress (IMC2014), Vol. Materials Science MS-1-O-2638 (pp 2185-2186). Prague, 7 September 2014 - 12 September 2014.
- . Journal of Physics: Conference Series, Vol. 522(1)
- Nanoparticle characterisation by advanced transmission electron microscopy: chemical identification, local spectroscopy, mapping and detection limits. 1st International Symposium on Profiling 2013(Book of Abstracts) (pp 103-103). Portugal, 2 September 2013 - 4 September 2013.
- . Journal of Physics: Conference Series, Vol. 471 (pp 012032-1-012032-4). Bristol, 7 April 2013 - 11 April 2013.
- . Journal of Physics: Conference Series, Vol. 471 (pp 012047-1-012047-4). Bristol, 7 April 2013 - 11 April 2013.
- . Journal of Physics: Conference Series, Vol. 471 (pp 012037-1-012037-4). Bristol, 7 April 2013 - 11 April 2013.
- . Journal of Physics: Conference Series, Vol. 471 (pp 012031-1-012031-6). Bristol, 7 April 2013 - 11 April 2013.
- . Journal of Physics: Conference Series, Vol. 471 (pp 012039-1-012039-4). Bristol, 7 April 2013 - 11 April 2013.
- Calibration of thickness-dependent k-factors of Germanium X-ray lines for improved analytical transmission electron microscopy of SiGe layers. 15th European Microscopy Congress, Vol. 2(Physical Sciences: Tools and Techniques) (pp 643-644). Oxford, 16 September 2012 - 21 September 2012.
- Simultaneous imaging of single gold atoms and lattice fringes of nano-particles in annular dark-field scanning transmission electron microscopy. 15th European Microscopy Congress, Vol. 2(Physical Sciences: Tools and Techniques) (pp 397-398). Oxford, 16 September 2012 - 21 September 2012.
- Comparing experiment with theory of X-ray absorption in thin SiGe films. 15th European Microscopy Congress, Vol. 2(Physical Sciences: Tools and Techniques) (pp 693-694). Oxford, 16 September 2012 - 21 September 2012.
- Determining sample thickness in transmission electron microscopy using X-ray line intensity ratios. 15th European Microscopy Congress, Vol. 2(Physical Sciences: Tools and Techniques) (pp 645-646). Oxford, 16 September 2012 - 21 September 2012.
- Surface roughening of chemical vapour deposited SiGe layers. 15th European Microscopy Congress, Vol. 1(Physical Sciences: Applications) (pp 933-934). Oxford, 16 September 2012 - 21 September 2012.
- Quantum dot nucleation on focused ion beam patterned GaAs substrates. 15th European Microscopy Congress, Vol. 1(Physical Sciences: Applications) (pp 927-928). Oxford, 16 September 2012 - 21 September 2012.
- Study of controlled quantum dot formation on focused ion beam patterned GaAs substrates. IEEE-Nano2012, Vol. digital abstract booklet (pp 716-718). London, 20 August 2012 - 23 August 2012.
- Performance of a cold field-emission gun double aberration corrected TEM/STEM at 80kV. Journal of Physics: Conference Series, Vol. 371 (pp 012013)
- Configuring a 300kV cold field-emission gun for optimum analytical performance. Journal of Physics: Conference Series, Vol. 371 (pp 012012)
- Characterization of thickness, elemental distribution and band-gap properties in AlGaN/GaN quantum wells by aberration-corrected TEM/STEM. Journal of Physics: Conference Series, Vol. 371 (pp 012014)
- . Journal of Physics: Conference Series, Vol. 371 (pp 012063-1-012063-4). Birmingham, UK, 6 September 2011 - 9 September 2011.
- . 17TH INTERNATIONAL CONFERENCE ON MICROSCOPY OF SEMICONDUCTING MATERIALS 2011, Vol. 326
- . 17TH INTERNATIONAL CONFERENCE ON MICROSCOPY OF SEMICONDUCTING MATERIALS 2011, Vol. 326
- . 17TH INTERNATIONAL CONFERENCE ON MICROSCOPY OF SEMICONDUCTING MATERIALS 2011, Vol. 326
- Room temperature GaAs/AlGaAs quantum cascade lasers with InGaP and InAlP waveguides. Optics InfoBase Conference Papers
- ELNES fine structure of transition metal oxides recorded by HR-EELS. Past, Present and Future of (S)TEM and its Applications (pp 51-51). Paris, 9 June 2010 - 11 June 2010.
- . Journal of Physics: Conference Series, Vol. 245 (pp 012087). Nottingham
- . Journal of Physics: Conference Series, Vol. 241
- . EMC2008- 14th European Microscopy Congress, Vol. 2 (Materials Science) (pp 375-376). Berlin, 1 September 2008 - 5 September 2008.
- Comparison of transmission electron microscopy mehods to measure layer thicknesses to sub-monolyer precision. EMC2008- 14th European Microscopy Congress, Vol. 2 (Materials Science) (pp 377-378). Berlin, 1 September 2008 - 5 September 2008.
- . EMC2008- 14th European Microscopy Congress, Vol. 1 (Instrumentation and Methods) (pp 65-66). Berlin, 1 September 2008 - 5 September 2008.
- . EMC2008- 14th European Microscopy Congress, Vol. 1 (Instrumentation and Methods) (pp 165-166). Berlin, 1 September 2008 - 5 September 2008.
- . EMC2008- 14th European Microscopy Congress, Vol. 1 (Instrumentation and Methods) (pp 723-724). Berlin, 1 September 2008 - 5 September 2008.
- A comparison of transmission electron microscopy methods to measure wetting layer thicknesses to sub-monolayer precision - art. no. 012091. EMAG: ELECTRON MICROSCOPY AND ANALYSIS GROUP CONFERENCE 2007, Vol. 126 (pp 12091-12091)
- A simple method to improve the quantification accuracy of energy-dispersive X-ray microanalysis - art. no. 012090. EMAG: ELECTRON MICROSCOPY AND ANALYSIS GROUP CONFERENCE 2007, Vol. 126 (pp 12090-12090)
- Investigating the Capping of InAs Quantum Dots by InGaAs. MICROSCOPY OF SEMICONDUCTING MATERIALS 2007, Vol. 120 (pp 259-262)
- Comparing InGaAs and GaAsSb Metamorphic Buffer Layers on GaAs Substrates for InAs Quantum Dots Emitting at 1.55 mu m. MICROSCOPY OF SEMICONDUCTING MATERIALS 2007, Vol. 120 (pp 263-268)
- Structural and Compositional Properties of Strain-Symmetrized SiGe/Si Heterostructures. MICROSCOPY OF SEMICONDUCTING MATERIALS 2007, Vol. 120 (pp 269-272)
- Quantifying the Top-Bottom Effect in Energy-Dispersive X-Ray Spectroscopy of Nanostructures Embedded in Thin Films. MICROSCOPY OF SEMICONDUCTING MATERIALS 2007, Vol. 120 (pp 185-188)
- Determining Buried Wetting Layer Thicknesses to Sub-Monolayer Precision by Linear Regression Analysis of Series of Spectra. MICROSCOPY OF SEMICONDUCTING MATERIALS 2007, Vol. 120 (pp 247-250)
- Mn-L ELNES fine structure recorded by high energy-resolution EELS. 16th International Microscopy Congress, Vol. 2 (Instrumentation) (pp 846-846). Sapporo, 3 September 2006 - 8 September 2006.
- Energy-dispersive x-ray mapping with a new monochromatic and aberration-corrected 200kV field-emission scanning transmission electron microscope. 16th International Microscopy Congress, Vol. 2 (Instrumentation) (pp 873-873). Sapporo, 3 September 2006 - 8 September 2006.
- Analysis of focused ion beam cut profiles by transmission electron microscopy. 16th International Microscopy Congress, Vol. 2 (Instrumentation) (pp 1112-1112). Sapporo, 3 September 2006 - 8 September 2006.
- Performance evaluation of a new monochromatic and aberration-corrected 200kV field-emission scanning transmission electron microscope. 16th International Microscopy Congress, Vol. 2 (Instrumentation) (pp 607-607). Sapporo, 3 September 2006 - 8 September 2006.
- Electron energy-loss spectroscopy at 0.1-0.2eV resolution in a new monochromatic and aberration-corrected 200kV field-emission scanning transmisssion electron microscope. 16th International Microscopy Congress, Vol. 2 (Instrumentation) (pp 833-833). Sapporo, 3 September 2006 - 8 September 2006.
- New methods for the quantitative chemical study of planar defects and interfaces by transmission electron microscopy. 7th Multinational Congress on Microscopy (MCM2005) (pp 75-78). Ljubljana, 26 June 2005 - 30 June 2005.
- High resolution ELNES characterization of chemical bonding in low-dielectric constant materials for interconncet isolation. Microscopy Congress 2005 (pp 238-238). Davos
- ConceptEM: a new method to quantify solute segregation to interfaces or planar defect structures by analytical TEM and applications to inversion domain boundaries in doped zinc oxide. Microscopy of Semiconducting Materials, Vol. 107 (pp 199-202)
- The mechanism of the Stranski-Krastanov transition. Quantum Dots: Fundamentals, Applications, and Frontiers, Vol. 190 (pp 71-88)
- Application of a new method for measuring small amounts of dopants at planar faults: tin-rich inversion boundaries in zinc oxide. 13th European Microscopy Congress (EMC 2004), Vol. 3 (pp 63-64). Herentals, 22 August 2004 - 27 August 2004.
- Diffusion and segregation effects in doped manganite/titanate thin film structures. 13th European Microscopy Congress (EMC 2004), Vol. 2 (Materials Sciences) (pp 243-244). Herentals, 22 August 2004 - 27 August 2004.
- Segregation in compound semiconductors: the Stranski-Krastanow epitaxial transition and electron beam damage processes. 13th European Microscopy Congress (EMC 2004), Vol. 2 (Materials Sciences) (pp 417-418). Herentals, 22 August 2004 - 27 August 2004.
- A new way to process and analyse quantitatively series of energy-filtered images of planar structures such as thin films or interfaces. 13th European Microscopy Congress (EMC 2004), Vol. 1 (Instrumentation and Methodology) (pp 251-252). Herentals, 22 August 2004 - 27 August 2004.
- The limits of lattice imaging compared to annular dark-field imaging for determining size distributions of nano-particles. 13th European Microscopy Congress (EMC 2004), Vol. 2 (Materials Sciences) (pp 119-120). Herentals, 22 August 2004 - 27 August 2004.
- A simple method to determine the chromatic aberration of a transmission electron microscope with imaging energy filter. 13th European Microscopy Congress (EMC 2004), Vol. 1 (Instrumentation and Methodology) (pp 33-34). Herentals, 22 August 2004 - 27 August 2004.
- . Microscopy and Microanalysis, Vol. 9(Suppl. 3) (pp 152-153). Cambridge, 7 September 2003 - 12 September 2003.
- Electron energy loss spectroscopic profiling of semiconductor hetero- and nano-structures: theory, implementation, applications. MICROSCOPY OF SEMICONDUCTING MATERIALS 2003(180) (pp 27-32)
- Spectrum imaging studies of ohmic contacts on GaN thin films. 15th International Congress on Electron Microscopy, Vol. 3 (Interdisciplinary) (pp 263-264). Onderstepoort, 1 September 2002 - 6 September 2002.
- Energy filtered TEM study of silver-cobalt nano-particles. 15th International Congress on Electron Microscopy, Vol. 3 (Interdisciplinary) (pp 261-262). Onderstepoort, 1 September 2002 - 6 September 2002.
- Spectrum imaging of thin films of oxides and perovskites. 15, Vol. 3 (Interdisciplinary) (pp 123-124). Onderstepoort, 1 September 2002 - 6 September 2002.
- Energy filtered TEM study of gold nano-particles on nano-crystalline anatase support. 15th International Congress on Electron Microscopy, Vol. 3 (Interdisciplinary) (pp 259-260). Onderstepoort, 1 September 2002 - 6 September 2002.
- Solving the atomic structure of inversion boundaries in Sb2O3-doped zinc oxide. 15th International Congress on Electron Microscopy, Vol. 1 (Physics and Materials) (pp 531-532). Onderstepoort, 1 September 2002 - 6 September 2002.
- Test of a new analytical method to measure the composition of a planar fault. 15th International Congress on Electron Microscopy, Vol. 1 (Physics and Materials) (pp 535-536). Onderstepoort, 1 September 2002 - 6 September 2002.
- Epitaxial island growth and the Stranski-Krastanow transition. CURRENT ISSUES IN HETEROEPITAXIAL GROWTH-STRESS RELAXATION AND SELF ASSEMBLY, Vol. 696 (pp 3-10)
- Exit wave reconstruction and elemental mapping of twin boundaries in the system ZnO-Ga2O3. Microscopy and Microanalysis, Vol. 7(Suppl. 2) (pp 290-291). New York, 2001 - 2001.
- Correlating compositional, structural and optical properties of InGaN quantum wells by transmission electron microscopy. MICROSCOPY OF SEMICONDUCTING MATERIALS 2001(169) (pp 267-272)
- How InGaAs islands form on GaAs substrates: the missing link in the explanation of the Stranski-Krastanow transition. MICROSCOPY OF SEMICONDUCTING MATERIALS 2001(169) (pp 85-88)
- Structure and chemistry of domains and interfaces in Ga2O3-doped ZnO. 4th German-Slovenian Seminar on Joint Projects in Materials Science and Technology (pp 2-3). Stuttgart
- Quantitative EDS analysis of inversion boundaries in Sn-doped ZnO. 4th German-Slovenian Seminar on Joint Projects in Materials Science and Technology (pp 14-15). Stuttgart
- Auger depth profile analysis and EFTEM analysis of annealed Ti/Al-contacts on Si-doped GaN. Joint Meeting of the Belgian and Dutch Societies for Microscopy (pp 172-173). Rijnsburg, 2000 - 2000.
- Thermal stability of ZnMgSSe / ZnSe laser heterostructures. ISCS-27. Piscataway, 2000 - 2000.
- Structural and spectroscopic characterisation of amorphous silicon sub-oxides. 12th European Congress on Electron Microscopy, Vol. 2 (Physical Sciences) (pp 465-466). Brno, 9 July 2000 - 14 July 2000.
- Structure and composition of inversion boundaries in Sn-doped ZnO. 12th European Congress on Electron Microscopy, Vol. 2 (Physical Sciences) (pp 435-436). Brno, 9 July 2000 - 14 July 2000.
- Charge balance models for inversion boudnaries in ZnO. 12th European Congress on Electron Microscopy, Vol. 2 (Physical Sciences) (pp 437-438). Brno, 9 July 2000 - 14 July 2000.
- Quantification of segregation to grain boundaries and diffusion at interfaces by energy-filtered transmission electron microscopy. 12th European Congress on Electron Microscopy, Vol. 2 (Physical Sciences) (pp 409-412). Brno, 9 July 2000 - 14 July 2000.
- The behaviour of olivine in refractories used in steel making processes - Thermodynamic considerations. APPLIED MINERALOGY, VOLS 1 AND 2 (pp 875-878)
- . Materials Research Society Fall Meeting, Vol. 540 (pp 267-272). Boston (book), cambridge (on-line), 1998 - 1998.
- Application of spatially resolved electron energy-loss spectroscopy to the quantitative study of thin layer systems. Optik, Vol. 110(Suppl. 8) (pp 58-58). Dortmund
- Investigation of gold nano-particles by energy-filtered imaging. ELECTRON MICROSCOPY AND ANALYSIS 1999(161) (pp 243-248)
- Application of spatially resolved electron energy-loss spectroscopy to the quantitative analysis of semiconducting layer structures. MICROSCOPY OF SEMICONDUCTING MATERIALS 1999, PROCEEDINGS(164) (pp 121-128)
- Quantification of the composition of silicon germanium/silicon structures by high-angle annular dark field imaging. ELECTRON MICROSCOPY AND ANALYSIS 1997(153) (pp 303-306)
- Scattering distribution from semiconductors as a function of angle and energy loss in the electron microscope. Materials Research Society Symposium - Proceedings, Vol. 466 (pp 113-118)
- A study of interdiffusion and germanium segregation in low-pressure chemical vapour deposition of SiGe/Si quantum wells. MICROSCOPY OF SEMICONDUCTING MATERIALS 1997(157) (pp 47-54)
- The determination of absorption parameters in Si and GaAs using energy filtered imaging. ELECTRON MICROSCOPY AND ANALYSIS 1995, Vol. 147 (pp 179-182)
- The role of plasmon scattering in the quantitative contrast analysis of high-resolution lattice images of GaAs. ELECTRON MICROSCOPY AND ANALYSIS 1995, Vol. 147 (pp 195-198)
- A contribution to the quantitative comparison of experimental high-resolution electron micrographs and image simulations. MICROSCOPY OF SEMICONDUCTING MATERIALS 1995, Vol. 146 (pp 53-56)
- The limitations of pattern recognition and displacement measurement techniques for evaluating HREM images of strained semiconductor interfaces. ELECTRON MICROSCOPY AND ANALYSIS 1995, Vol. 147 (pp 103-106)
- Strain relaxation induced local crystal tilts at Si/SiGe interfaces in cross-sectional transmission electron microscope specimens. MICROSCOPY OF SEMICONDUCTING MATERIALS 1995, Vol. 146 (pp 11-16)
- AlAs/GaAs quantum well structures: interface properties investigated by high-resolution transmission electron microscopy and photoluminescence spectroscopy. 4th International Conference on Formation of Semiconductor Interfaces (ICFSI-4) (pp 562-565). Singapore
- The effect of thin crystal strain relaxation on high-resolution images of Si/Si0.8Ge0.2 quantum wells. ELECTRON MICROSCOPY 1994, VOL 1 (pp 365-366)
- CORRELATION BETWEEN THE STRUCTURAL AND OPTICAL-PROPERTIES OF ALAS/GAAS QUANTUM-WELL STRUCTURES. MICROSCOPY OF SEMICONDUCTING MATERIALS 1993(134) (pp 449-454)
- (pp 893-894)
- . Frontiers in BioImaging, 14 July 2016 - 15 July 2016.
- . http://emag2016.iopconfs.org/, 6 April 2016 - 8 April 2016.
- Scanning transmission electron microscopy study of InP quantum dots. Photon '10, Vol. abstract booklet (pp P1-55). Southampton, 23 August 2010 - 26 August 2010.
- Epitaxial growth by RP-CVD of relaxed germanium layers on (110) and (111) silicon substrates. 7th Int. Conf. Silicon Epitaxy and Heterostructures (ICSI-7), Vol. abstract booklet. Leuven, 29 August 2011 - 2 September 2011.
- Combining imaging with local spectroscopy in an energy-filtered TEM/STEM. Microscopy Congress 2005 (pp 240-240). Davos
- A new method of analytical TEM for the determination of very small amounts of dopants at interfaces. 8th Asian-Pacific Conf. on Electron Microscopy (pp 438-439). Tokyo, 2004 - 2004.
- The dependence of the growth rate of LPCVD grown SiGe quantum wells on the Ge composition and the layer thickness. EUREM-11 (Europ. Conf. Electron Microscopy), Vol. 1 (pp 317-318). Brussels, 1996 - 1996.
- Methods for reliable elemental mapping despite low signal-to-noise ratios and overlapping ionisation edges. Dreil盲ndertagung f眉r Elektronenmikroskopie(abstract booklet) (pp 29-29). Innsbruck, 9 September 2001 - 14 September 2001.
- First results from a monochromated and Cs-corrected 200kV STEM. EDGE 2005: Endhanced Data Generated with Electrons(abstract booklet) (pp 55-55). Grundlsee, 1 May 2005 - 5 May 2005.
- Round-robin results of the quantitative analysis of FeNi nanoparticle compositions. EDGE 2005: Endhanced Data Generated with Electrons(abstract booklet) (pp 50-50). Grundlsee, 1 May 2005 - 5 May 2005.
- Optically pumped transverse lasers based on ZnMgSSe/ZnSe and InGaN/GaN heterostructures. Proceedings SPIE, Vol. 4751 (pp 542-548). Minsk
- Quantitative high-resolution electron microscopy of semiconductor heterostructures. Japanese-German Forum on Information Technology (pp 6-10). Oita
Patents
- Collection of electromagnetic Radiation emitted from Particle-irradiated Samples. WO 2011030156 (A2) Appl. 17 Mar 2011.
Reports
- Defending the viva
- Book review of 鈥楩undamentals of Fluorescence Microscopy鈥 by Partha Pratim Mondal and Alberto Diaspro, Springer, Dordrecht, 2014, ISBN: 978-94-007-7544-2
- Leserbrief zum Beitrag 鈥楢uswendig lernen und wieder vergessen鈥 by J. Loviscach (abbreviated commentary on teaching mathematics to engineering students; in German)
- Book review of 'Sample Preparation Handbook for Transmission Electron Microscopy' by J. Ayache, L. Beaunier, J. Boumendil, G Ehret, D. Laub (Springer, New York, 2010, ISBN 978-1-4419-5974-4), published in infocus magazine
- Electron microscopy
- Electron microscopy of TMR structures
- Structural studies of Fe-Pt multilayers
- Structural and magnetic properties of FeCo films modified by combinatorial ion implantation
- Transmission electron microscopy
- Electron microscopy at the Center for Advanced European Studies and Research
- Modelling of the Stranski-Krastanow transition and epitaxial island growth
- Korrelation optischer und struktureller Eigenschaften von AlAs/GaAs- Quantentopfstrukturen
Theses / Dissertations
- Teaching activities
-
- EEE345 'Engineering Electromagnetics'
- EEE6233 'Physical Principles of Imaging: Radiation-Matter Interaction'
- Professional activities and memberships
-
- Reader in Advanced Electron Microscopy
- Departmental Tutor for Postgraduate Research Students
- Research students
Student Degree Status Primary/Secondary Guo R PhD Current Primary Luo P PhD Current Secondary Yan H PhD Current Secondary Wang X PhD Graduated Primary Amari H PhD Graduated Primary Angadi V PhD Graduated Primary Parri M C PhD Graduated Primary Qiu Y PhD Graduated Primary Taghi Khani A PhD Graduated Primary Zhang H PhD Graduated Primary