Publications
2023
F. Zahari, R. Marquardt, M. Kalläne, O. Gronenberg, C. Schlueter, Y. Matveyev, G. Haberfehlner, F. Diekmann, A. Nierhauve, J. Buck, A. Hanff, G. Kolhatkar, G. Kothleitner, L. Kienle, M. Ziegler, Jürgen Carstensen, K. Rossnagel, H. Kohlstedt (2023) “Trap-assisted memristive switching in HfO2-based devices studied by in-situ soft and hard X-ray photoelectron spectroscopy” Advanced Electronic Materials, 2201226.
R. Marquardt, F. Zahari, J. Carstensen, G. Popkirov, O. Gronenberg, G. Kolhatkar, H. Kohlstedt, M. Ziegler (2023) “Impedance spectroscopy on hafnium oxide-based memristive devices” Advanced Electronic Materials, 2201227.
2022
E. Kröger, A. Petraru, A. Hanff, R. Soni, M. Kalläne, J.D. Denlinger, T. Learmonth, J.-H. Guo, K.E. Smith, T. Schneller, B. Freelon, L. Kipp, H. Kohlstedt, K. Rossnagel, G. Kolhatkar (2022) “Digging deeper: Buried layers and interfaces studied by modified total electron yield and soft X-ray absorption spectroscopy” Applied Physics Letters 120(18), 181601.
R. Marquardt, J. Cipo, F. Schlichting, G. Kolhatkar, H. Kohlstedt, H. Kersten (2022) “Correlation between properties of DC-magnetron sputtered thin niobium nitride films and plasma parameters” Thin Solid Films, 742, 139046.
2021
A. Hadj Youssef, G. Kolhatkar, I. Amaechi, R. Katoch, Y. Gonzalez, A. Merlen, A. Ruediger (2021) “Giant step bunching on SrTiO3 thin films grown epitaxially on vicinal MgO (100) surfaces,” Applied Surface Science, 570, 151266.
J. Zhang, G. Kolhatkar, A. Ruediger (2021) “Localized surface plasmon resonance shift and its application in scanning near-field optical microscopy,” Journal of Materials Chemistry C, 9, 6960-6969.
Hadj Youssef, J. Zhang, A. Ehteshami, G. Kolhatkar, C. Dab, D. Berthomieu, A. Merlen, F. Légaré, A. Ruediger (2021) “Symmetry forbidden mode detection in SrTiO3 nanoislands with tip-enhanced Raman spectroscopy,” Journal of Materials Chemistry C, 125 (11), 6200-6208.
A. Lubio, A. Dörfler, J. Plathier, T. Dequivre, G. Kolhatkar, S. Charlebois, A. Ruediger (2021) “Correlation of local strain and temperature measurements in confocal Raman microscopy,” Journal of Raman Spectroscopy, 52(6), 1123.
I. Amaechi, A. Hadj Youssef, G. Kolhatkar, D. Rawach, C. Gomez-Yañez, J. Claverie, S. Sun, A. Ruediger (2021) “Ultrafast microwave-assisted hydrothermal synthesis and photocatalytic behaviour of ferroelectric Fe3+-doped BaTiO3 under simulated solar irradiation,” Catalysis Today, 360, 90.
2020
S. Sauze, M. R. Aziziyan, P. Brault, G. Kolhatkar, A. Ruediger, A. Korinek, D. Machon, R. Arès, A. Boucherif (2020) “Integration of 3D Nanographene into Mesoporous Germanium,” Nanoscale, 12 (47), 23984.
I. Amaechi, R. Katoch, G. Kolhatkar, S. Shuhui, A. Ruediger (2020) “Particle size effect on the photocatalytic kinetics of barium titanate powders,” Catalysis Science & Technology, 10 (18), 6274.
J. Zhang, A. Hadj Youssef, A. Dörfler, G. Kolhatkar, A. Merlen, A. Ruediger (2020) “Sample induced intensity variations of localized surface plasmon resonance in tip-enhanced Raman spectroscopy,” Optics Express, 28 (18), 25998.
E. Sokullu, M. Pinsard, J. Zhang, J. Plathier, G. Kolhatkar, A. Blum, F. Légaré, A. Ruediger, T. Ozaki, M. A. Gauthier (2020) “Plasmonic enhancement of two-photon excitation fluorescence by colloidal assemblies of very small AuNPs templated on M13 phage,” Biomacromolecules, 21 (7), 2705.
A. Hadj Youssef, J. Zhang, A. Dörfler, G. Kolhatkar, A. Merlen, A. Ruediger (2020) “Topography-induced variations of localized surface plasmon resonance in tip-enhanced Raman configuration,” Optics Express, 28 (9), 14161.
T. Dugger, S. Sarkar, S. Correa-Garhwal, M. Zhernenkov, Y. Zhang, G. Kolhatkar, R. Mohan, L. Cruz, A. Lubio, A. Ruediger, C. Hayashi, K. Uhrich, D. Kisailus, (2020) “Ultrastructure and Mechanics of Annealed Nephila clavipes Major Ampullate Silk,” Biomacromolecules, 21(3), 1186.
A. Dörfler, G. Kolhatkar, U. Wagner, A. Ruediger (2020) “The Effects of Thin Film Homogeneity on the Performance of Ferroelectric Tunnel Junctions,” Journal of Physics: Condensed Matter, 32, 185302.
2019
C. Parisien, G. Kolhatkar, A. Dörfler, F. Crispino, A. Lajeunesse, A. Ruediger (2019) “Contrast enhancement for the recovery of obliterated serial numbers in different polymers by correlated Raman imaging of strain, phonon-lifetime and strain-induced anisotropy,” Analytical Chemistry, 91(22), 14247.
B. Mittermeier, A. Dörfler, A. Horoschenkoff, R. Katoch, C. Schindler, A. Ruediger, G. Kolhatkar, (2019) “CMOS compatible Hf0.5Zr0.5O2 ferroelectric tunnel junctions for neuromorphic devices,” Advanced Intelligent Systems, 1(5), 1900034.
I. Amaechi, G. Kolhatkar, D. Rawach, S. Sun, A. Ruediger (2019) “B-site modified photoferroic Cr3+-doped barium titanate nanoparticles: microwave-assisted hydrothermal synthesis, photocatalytic and electrochemical properties,” RSC Advances, 9, 20806.
G. Kolhatkar, M. Nicklaus, A. Hadj Youssef, C. Cojocaru, M. Rivard, A. Merlen, F. Légaré, A. Ruediger, (2019) “Second harmonic generation investigation of symmetry breaking and flexoelectricity induced by nanoindentations in SrTiO3,” Advanced Functional Materials, 1901266.
G. Kolhatkar, C. Parisien, A. Ruediger, C. Muehlethaler (2019) “Latent fingermark imaging by single-metal deposition of gold nanoparticles and surface enhanced Raman spectroscopy,” Frontiers in Chemistry, 7, 440.
G. Kolhatkar, B. Mittermeier, Y. Gonzalez, F. Ambriz-Vargas, M. Weismueller, A. Sarkissian, C. Gomez-Yanez, R. Thomas, C. Schindler, A. Ruediger, (2019) “BiFe1-xCrxO3 ferroelectric tunnel junctions for neuromorphic systems”, ACS Applied Electronic Materials, 1 (6), 828.
M. Kracklauer, F. Ambriz-Vargas, G. Kolhatkar, B. Huber, C. Schindler, A. Ruediger, (2019) “Oxygen vacancy filament-based resistive switching in Hf0.5Zr0.5O2 thin films for non-volatile memory,” Advanced Materials Letters, 10 (6), 405.
2018
M. Nicklaus, G. Kolhatkar, J. Plathier, C. Dab, A. Ruediger, (2018) “Direct observation of core-shell structures in individual lead titanate ferroelectric nanostructures by tip-enhanced refractive index mapping,” Advanced Functional Materials, 1806770.
M. Agati, S. Boninelli, P. Castrucci, G. Amiard, R. Pandiyan, G. Kolhatkar, R. Dolbec, A. Ruediger, M. A. El Khakani, (2018) “Formation of silicon nanocrystal chains induced via Rayleigh instability in Si/SiO2 core/shell ultrathin nanowires synthesized by an inductively-coupled-plasma torch process,” Journal of Physics: Materials, 2.1 (2018): 015001.
A. Hadj Youssef, G. Kolhatkar, A. Merlen, R. Thomas, A. Ruediger, (2018) “Surface Preparation and the Evolution of Atomically Flat Step Terrace Morphology of MgO Single Crystals,” AIP Advances, 8, 095025.
M. Barberio, S. Vallière, M. Sciscio, G. Kolhatkar, A. Ruediger, P. Antici, (2018) “Graphitization of Diamond by Laser-Accelerated Proton Beams,” Carbon, 139, 531-537.
G. Kolhatkar, A. Merlen, J. Zhang, C. Dab, G. Q. Wallace, F. Lagugné-Labarthet, A. Ruediger, (2018) “Optical near-field mapping of plasmonic nanostructures prepared by nanosphere lithography,”Beilstein Journal of Nanotechnology, 9, 1536-1543.
G. Kolhatkar, F. Ambriz-Vargas, B. Huber, R. Thomas, A. Ruediger, (2018) “Thermionic Emission Based Resistive Memory with Ultrathin Ferroelectric BiFe1−xCrxO3 Films Deposited by Mineralizer-Free Microwave-Assisted Hydrothermal Synthesis,” Crystal Growth & Design, 18 (3), 1864-1872.
G. Kolhatkar, A. Boucherif, A.R. Boucherif, A. Dupuy, L. G. Frechette, R. Ares, A. Ruediger, (2018) “Extreme temperature stability of thermally insulating graphene-mesoporous-silicon nanocomposite,” Nanotechnology, 29, 145701.
G. Kolhatkar, J. Plathier, A. Ruediger, (2018) “Nanoscale investigation of materials, chemical reactions, and biological systems by tip enhanced Raman spectroscopy – A review,” Journal of Materials Chemistry C, 6, 1307-1319.
C. Dab, G. Kolhatkar, J. Plathier, R. Thomas, A. Ruediger, (2018) “Dependence of Apertureless Scanning Near-Field Spectroscopy on Nanoscale Refractive Index Changes,” Plasmonics, 13 (1), 99-106.
2017
Ruediger, A. Hadj Youssef, F. Ambriz-Vargas, G. Kolhatkar, M. A. Gauthier, R. Thomas, A. Sarkissian, U.S. Patent ref.: 773/14448.113 – “Ferroelectric Tunnel Junction and Method of Fabrication Thereof” (2017).
C. Parisien, G. Kolhatkar, F. Crispino, A. Lajeunesse, A. Ruediger, (2017) “Reconstruction of obliterated characters in polycarbonate through spectral imaging,” Analytical Chemistry, 89 (21), 11648-11652.
G. Kolhatkar, F. Ambriz-Vargas, R. Thomas, A. Ruediger, (2017) “Microwave-assisted hydrothermal synthesis of BiFexCr1-xO3 ferroelectric thin films,” Crystal Growth & Design, 17 (11), 5697-5703.
G. Kolhatkar, J. Plathier, A. Pignolet, A. Ruediger, (2017) “Effect of the Gold Crystallinity on the Enhanced Luminescence Signal of Scanning Probe Tips in Apertureless Near-Field Optical Microscopy,” Optics Express, 25 (21), 25929-25937 (9 pages).
T. Dequivre, G. Kolhatkar, A. Hadj Youssef, X.T. Le, G.M. Brisard, A. Ruediger, S.A. Charlebois (2017) “Wet Metallization of High Aspect Ratio TSV Using Electrografted Polymer Insulator to Suppress Residual Stress in Silicon,” IEEE Transactions on Device and Materials Reliability, 17 (3), 514-521.
F. Ambriz-Vargas, G. Kolhatkar, M. Broyer, A. Hadj Youssef, R. Nouar, A. Sarkissian, R. Thomas, C. Gomez-Yáñez, M. A. Gauthier, A. Ruediger, (2017) “A Complementary Metal Oxide Semiconductor Process-Compatible Ferroelectric Tunnel Junction,” ACS Appl. Mater. Interfaces, 9 (15), 13262-13268.
F. Ambriz-Vargas, G. Kolhatkar, R. Thomas, R. Nouar, A. Sarkissian, C. Gomez-Yanez, M. A. Gauthier, A. Ruediger, (2017) “Tunneling electroresistance effect in a Pt/Hf0.5Zr0.5O2/Pt structure,” Appl. Phys. Lett., 110, 93106.
A. R. Boucherif*, A. Boucherif*, G. Kolhatkar, A. Ruediger, R. Arès, (2017) “Graphene-Mesoporous Si Nanocomposite as a Compliant Substrate for Heteroepitaxy,” Small, 13, 1603269.
2016
I. Velasco-Davalos, F. Ambriz-Vargas, G. Kolhatkar, R. Thomas, A. Ruediger. (2016) “Synthesis of BiFeO3 thin films on single-terminated Nb:SrTiO3 (111) substrates by intermittent microwave assisted hydrothermal method”, AIP Advances, 6, 065117.
G. Kolhatkar, A. Boucherif, C. Dab, S. Fafard, V. Aimez, R. Ares, A. Ruediger, (2016), “Composition Variation in Al-Based Dilute Nitride Alloys Using Apertureless Scanning Near-Field Optical Microscopy”, Phys. Chem. Chem. Phys., 18, 30546-30553.
G. Kolhatkar, A. Boucherif, Y. A. Bioud, S. Fafard, A. Ruediger, V. Aimez, R. Arès. (2016) “Electrical and structural properties of AlGaNAs alloys grown by chemical beam epitaxy,” Physica Status Solidi (B), 5, 1.
2015
R. Cheriton, M. M. Wilkins, P. Sharma, C. E. Valdivia, A. H. Trojnar, H. Schriemer, J. Gupta, B. Bouzazi, G. Kolhatkar, et al., (2015). “Design Optimizations of InGaAsN(Sb) subcells for Concentrator Photovoltaic Systems,” Journal of Vacuum Science and Technology B, 34 (2), 02M103-1-5.
2014
G. Kolhatkar, A. Boucherif, C.E. Valdivia, S.G. Wallace, S. Fafard, V. Aimez, R. Arès, (2014). “Growth optimization and optical properties of AlGaNAs alloys,” Journal of Applied Physics, 115, 163513.
2013
G. Kolhatkar, A. Boucherif, C.E. Valdivia, S.G. Wallace, S. Fafard, V. Aimez, R. Arès, (2013). “Al-enhanced N incorporation in GaNAs alloys grown by Chemical Beam Epitaxy,” Journal of Crystal Growth, 380, 256-260.
B. Paquette, M. DeVita, A. Turala, G. Kolhatkar, A. Boucherif, A. Jaouad, et al., (2013). “Optimization of p-doping in AlGaAs grown by CBE using TMA for AlGaAs/GaAs tunnel junctions,” Journal of Crystal Growth, 374, 1-4.
2012
G. Kolhatkar, J.F. Wheeldon, C.E. Valdivia, A.W. Walker, S. Fafard, A. Turala, et al., (2012). “Current–voltage measurements within the negative differential resistance region of AlGaAs/AlGaAs tunnel junctions for high concentration photovoltaics,” International Journal of Nanoscience, 11, 1240014.
2010
J. F. Wheeldon, C. E. Valdivia, A. Walker, G. Kolhatkar, A. Jaouad, et al., (2010). “Performance Comparison of AlGaAs, GaAs and InGaP Tunnel Junctions for Concentrated Multi-Junction Solar Cells,” Progress in Photovoltaics: Research and Applications, 19 (4), 442-452.