Dr.-Ing. Niklas Wolff


Professional Career

Since 2020   Researcher (Postdoc) at Christian-Albrechts-Universität zu Kiel, Kiel Germany
2015 - 2020   Research assistent (PhD, Nanostructure Analysis of Materials for Medical Application using Transmission Electron Microscopy, Prof. Dr. Kienle) at Christian-Albrechts-Universität zu Kiel, Kiel, Germany
2012 - 2015   M.Sc. in Materials Science and Engineering at Christian-Albrechts-Universität zu Kiel, Kiel, Germany
2009 - 2012   B.Sc. in Materials Science and Engineering at Christian-Albrechts-Universität zu Kiel, Kiel, Germany



Dr.-Ing. Niklas Wolff
Room A-234
Kaiserstraße 2, 24143 Kiel, Germany
Phone: +49 431 880-6179
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Website: Link


Projects and Positions

Description Role
A6 - Microstructure and Structural Change of Magnetoelectric and Piezotronic Sensors Doctoral researcher


CRC-related Publications

K. Pingen, A. M. Hinz, P. Sandström, N. Wolff, L. Kienle, L. Scipioni, J. Greer, E. von Hauff, L. Hultman, J. Birch, C.-L. Hsiao: High Growth Rate Magnetron Sputter Epitaxy of GaN Using a Solid Ga Target, Vacuum , vol. 220, 112852, 2024. 
N. Wolff, G. Schönweger, I. Streicher, Md R. Islam, N. Braun, P. Straňák, L. Kirste, M. Prescher, A. Lotnyk, H. Kohlstedt, S. Leone, L. Kienle, S. Fichtner: Demonstration and STEM Analysis of Ferroelectric Switching in MOCVD-Grown Single Crystalline Al0.85Sc0.15N, Adv. Phys. Res., 2300113, 2024. 
K. Pingen, S. Neuhaus, N. Wolff, L. Kienle, A Žukauskaitė, E. von Hauff, A. M. Hinz: Influence of Si(111) Substrate Off-Cut on AlN Film Crystallinity Grown by Magnetron Sputter Epitaxy, Journal of Applied Physics, vol. 134, issue 2, 2023. 
G. Schönweger, N. Wolff, Md R. Islam, M. Gremmel, A. Petraru, L.Kienle, H.Kohlstedt, S. Fichtner: In-Grain Ferroelectric Switching in Sub-5 nm Thin Al0.74Sc0.26N Films at 1 V, Advanced Science, 2302296, 2023.
R. Guido, P. D. Lomenzo, Md R. Islam, N. Wolff, M. Gremmel, G. Schönweger, H. Kohlstedt, L. Kienle, T. Mikolajick, S. Fichtner, U. Schroeder: Thermal Stability of the Ferroelectric Properties in 100 nm-Thick Al0.72Sc0.28N, ACS Appl. Mater. Interfaces, vol. 15, issue 5, p. 7030–7043, 2023.
Md R. Islam, G. Schönweger, N. Wolff, A. Petraru, H. Kohlstedt, S. Fichtner, L. Kienle: A Comparative Study of Pt/Al0.72Sc0.28N/Pt-Based Thin-Film Metal-Ferroelectric-Metal Capacitors on GaN and Si Substrates, ACS Appl. Mater. Interfaces 15, 35, 41606–41613, 2023. 
G. Masciocchi, J. W. van der Jagt, M.-A. Syskaki, A. Lamperti, N. Wolff, A. Lotnyk, J. Langer, L. Kienle, G. Jakob, B. Borie, A. Kehlberger, D. Ravelosona, M. Kläui: Control of Magnetoelastic Coupling in Ni/Fe Multilayers using He+ ion Irradiation, Appl. Phys. Lett., vol. 121, issue 18 , 182401, 2022.
G. Schönweger, Md. R. Islam, N. Wolff, A. Petraru, L. Kienle, H.Kohlstedt, S.Fichtner: Ultrathin Al1−xScxN for Low-Voltage-Driven Ferroelectric-Based Devices, PSS rapid research letters, vol. 17, issue 1, 2200312, 2023.
N. Wolff, M. R. Islam, L. Kirste, S. Fichtner, F. Lofink, A. Žukauskaitė, L. Kienle: Al1−xScxN Thin Films at High Temperatures: Sc-Dependent Instability and Anomalous Thermal Expansion, Micromachines, no. 13, issue 8 , 01282, 2022.
M. T. Bodduluri , B.Gojdka , N.Wolff , L. Kienle , T. Lisec, F. Lofink: Article Investigation of Wafer-Level Fabricated Permanent Micromagnets for MEMS, Micromachines , no. 13, issue 5, pp. 742, 2022.
J. Su , S. Fichtner , M. Zubair Ghori , N. Wolff , M. R. Islam , A. Lotnyk , D. Kaden , F. Niekiel, L. Kienle, B. Wagner, F. Lofink: Growth of Highly c-Axis Oriented AlScN Films on Commercial Substrates, Micromachines , no. 13, issue 5, pp. 783, 2022.
G. Schönweger, A. Petraru, Md R. Islam, N. Wolff, B.t Haas, A. Hammud, C. Koch, L. Kienle, H. Kohlstedt, S. Fichtner: From Fully Strained to Relaxed: Epitaxial Ferroelectric Al1-xScxN for III-N Technology, Advanced Functional Materials, no. 32, issue 21 , pp. 2109632, 2022.
N. Wolff, T. Braniste, H.Krüger, S. Mangelsen, Md R.Islam, U. Schürmann, L. M. Saure, F. Schütt, S. Hansen, H.Terraschke, R.Adelung, I. Tiginyanu, L. Kienle: Synthesis and Nanostructure Investigation of Hybrid β-Ga2O3/ZnGa2O4 Nanocomposite Networks with Narrow-Band Green Luminescence and High Initial Electrochemical Capacity, Small, vol. 19, issue 18, 2207492, 2023.
L. Bumke, N. Wolff, C. Chluba, T. Dankwort, L. Kienle, E. Quandt: Coherent Precipitates as a Condition for Ultra-Low Fatigue in Cu-Rich Ti53.7Ni24.7Cu21.6 Shape Memory Alloys, Shape Memory and Superelasticity, volume 7, pp. 526–540, 2021.
P. Jordt, N. Wolff, S. B. Hrkac, S. Shree, D. Wang, R. J. Harder, C. Kübel, R. Adelung, O. G. Shpyrko, O. M. Magnussen, L. Kienle, B. M. Murphy: Visualizing Intrinsic 3D-Strain Distribution in Gold Coated ZnO Microstructures by Bragg Coherent X-Ray Diffraction Imaging and Transmission Electron Microscopy with Respect to Piezotronic Applications, Advanced Electronic Materials, vol. 7, issue 11, 2100546, 2021.
P. Pop-Ghe, N. Wolff, A. Rubab, L. Kienle, E. Quandt: Tailoring Growth Modes by Excess Alkali Addition in Magnetron Sputtered Potassium Sodium Niobate Thin Films, Materials Today Communications (2021), vol. 27, 102221, 2021.
P. Jordt, S. B. Hrkac, J. Gröttrup, A. Davydok, C. Krywka, N. Wolff, L. Kienle, R. Adelung, O. M. Magnussen, B. M. Murphy: Local Strain Distribution in ZnO Microstructures Visualized with Scanning Nano X-Ray Diffraction and Impact on Electrical Properties, Advanced Engineering Materials, vol. 23, issue 11, 110871, 2021.
M.R. Islam, N. Wolff, M. Yassine, G. Schönweger, B. Christian, H. Kohlstedt, O. Ambacher, F. Lofink, L. Kienle, S. Fichtner: On the Exceptional Temperature Stability of Ferroelectric Al1-xScxN Thin Films, Applied Physics Letters, vol. 118, issue 23, 232905, 2021.
N. Wolff, P. Jordt, J. Jetter, H. Vogt, A. Lotnyk, K. Seemann, S. Ulrich, E. Quandt, B. M. Murphy, L. Kienle: Nanostabilization of Tetragonal Distorted FeCo Variants in Ultra-Thin FeCo/TiN Multilayer Films, Materials Characterization, vol. 172, 110871, 2021.
N. Wolff, S. Fichtner, B. Haas, M.R. Islam, F. Niekiel, M. Kessel, O. Ambacher, C. Koch, B. Wagner, F. Lofink, L. Kienle: Atomic Scale Confirmation of Ferroelectric Polarization Inversion in Wurtzite-Type AlScN, Journal of Applied Physics, vol. 129, issue 3, 034103, 2021.
S. M. Curtis, N. Wolff, D. Dengiz, H. Lewitz, J. Jetter, L. Bumke, P. Hayes, E. Yarar, L. Thormählen, L. Kienle, D. Meyners, E. Quandt: Integration of AlN Piezoelectric Thin Films on Ultralow Fatigue TiNiCu Shape Memory Alloys, Journal of Materials Research 35, no. 10, pp. 1298–1306, 2020.
L. Siebert, N. Wolff, N. Ababii, M. Terasa, O. Luopan, A. Vahl, V. Duppel, H. Qiu, M. Tienken, M. Mirabelli, V. Sontea, F. Faupel, L. Kienle, R. Adelung: Facile Fabrication of Semiconducting Oxide Nanostructures by Direct Ink Writing of Readily Available Metal Microparticles and their application as Low Power Acetone Gas Sensors, Nano Energy, vol. 70, issue 2, 104420, 2020.
X. Tao, H. Jin, M. Mintken, N. Wolff, Y. Wang, R. Tao, Y. Li, H. Torun, J. Xie, J. Luo, J. Zhou, Q. Wu, S. Dong, J. Luo, L. Kienle, R. Adelung, Y. K. Mishra, Y. Q. Fu: Three-Dimensional Tetrapodal ZnO Microstructured Network Based Flexible Surface Acoustic Wave Device for Ultraviolet and Respiration Monitoring Applications, ACS Applied Nano Materials, vol. 3, issue 2, pp. 1468–1478, 2020.
N. Wolff, V. Ciobanu, M. Enachi, M. Kamp, T. Braniste, V. Duppel, S. Shree, S. Raevschi, M. Mendina-Sánchez, R. Adelung, G. Schmidt, L. Kienle, I. Tiginyanu: Advanced Hybrid GaN/ZnO Nanoarchitectured Microtubes for Fluorescent Micromotors Driven by UV Light, small, vol. 16, issue 2, 1905141, 2019.
S. Fichtner, N. Wolff, F. Lofink, L. Kienle, B. Wagner: AlScN: A III-V Semiconductor Based Ferroelectric, Journal of Applied Physics, vol. 125, issue 11, 114103, 2019.
N. Wolff, V. Hrkac, J. Ditto, V. Duppel, Y. Mishra, D. Johnson, R. Adelung, L. Kienle: Crystallography at the Nanoscale: Planar Defects in ZnO Nanospike, Journal of Applied Crystallography, vol. 52, pp. 1009-1015, 2019.
N. Wolff, P. Jordt, T. Braniste, V. Popa, E. Monaico, V. Ursaki, A. Petraru, R. Adelung, B. Murphy, L. Kienle, I. Tiginyanu: Modulation of Electrical Conductivity and Lattice Distortions in Bulk HVPE-Grown GaN, ECS Journal of Solid State Science and Technology, vol. 8, pp. 141–146, 2019.
E. Hadland, H. Jang, N. Wolff, R. Fischer, A. Lygo, G. Mitcheson, D. Li, L. Kienle, D. Cahill, D. Johnson: Ultralow Thermal Conductivity of Turbostratically Disordered MoSe2 Ultra-Thin Films and Implications for Heterostructures, Nanotechnology, vol. 30, no. 28, 285401, 2019.
O. Lupan, V. Postica, N. Wolff, J. Su, F. Labat, I. Ciofini, H. Cavers, R. Adelung, O. Polonskyi, F. Faupel, L. Kienle, B. Viana, T. Pauporté: Low-Temperature Solution Synthesis of Au-Modified ZnO Nanowires for Highly Efficient Hydrogen Nanosensors, ACS Applied Materials and Interfaces, vol. 11, issue 35, pp. 32115-32126, 2019.
V. Postica, I. Paulowicz, O. Lupan, F. Schütt, N. Wolff, A. Cojocaru, YK. Mishra, L. Kienle, R. Adelung: The Effect of Morphology and Functionalization on UV Detection Properties of ZnO Networked Tetrapods and Single Nanowires, Vacuum, vol. 166, pp. 393-398, 2019.
A. Piorra, V. Hrkac, N. Wolff, C. Zamponi, V. Duppel, J. Hadermann, L. Kienle, E. Quandt: (Ba0.85Ca0.15)(Ti0.9Zr0.1)O3 Thin Films Prepared by PLD: Relaxor Properties and Complex Microstructure, Journal of Applied Physics, vol. 125, issue 24, 244103, 2019.
I. Paulowicz, V. Postica, O. Lupan, N. Wolff, S. Shree, A. Cojocaru, M. Deng, Y. K. Mishra, I. Tiginyanu, L. Kienle, R. Adelung: Zinc Oxide Nanotetrapods with Four Different Arm Morphologies for Versatile Nanosensors, Sensors and Actuators B: Chemical, vol. 262, pp. 425-435, 2018.
O. Lupan, N. Wolff, V. Postica, T. Braniste, I. Paulowicz, V. Hrkac, Y. K. Mishra, I. Tiginyanu, L. Kienle, R. Adelung: Properties of a Single SnO2:Zn2SnO4 - Functionalized Nanowire Based Nanosensor, Ceramics International, vol. 44, issue 5, pp. 4859-4867, 2018.
M. Hoppe, O. Lupan, V. Postica, N. Wolff, V. Duppel, L. Kienle, I. Tiginyanu, R. Adelung: ZnAl2O4-Functionalized Zinc Oxide Microstructures for Highly Selective Hydrogen Gas Sensing Applications, Physica Status Solidi A, vol. 215, issue 7, 2018.
U. Schürmann, C. Chluba, N. Wolff, D. Smazna, R. Lima de Miranda, P. Junker, R. Adelung, E. Quandt, L. Kienle: Functional NiTi Grids for in situ Straining in the TEM, Ultramicroscopy, vol. 182, pp. 10-16, 2017. 
D. Smazna, N. Wolff, S. Shree, F. Schütt, Y.K. Mishra, L. Kienle, R. Adelung: Enhancing the Conductivity of ZnO Micro- and Nanowire Networks with Gallium Oxide, IEEE 7th International Conference Nanomaterials: Application and Properties (NAP), Odessa, pp. 01FNC07-1-01FNC07-5, 2021.
S. Fichtner, N. Wolff, G. Krishnamurthy, A. Petraru, S. Bohse, F. Lofink, S. Chemnitz, H. Kohlstedt, L. Kienle, B. Wagner: Identifying and Overcoming the Interface Originating C-Axis Instability in Highly Sc Enhanced AlN for Piezoelectric Micro-Electromechanical Systems, Journal of Applied Physics, vol. 122, issue 3, 035301, 2017.