Contact

Porträt Dr. Hlawacek, Gregor; FWIZ-N

Dr. Gregor Hlawacek

Head Ion Induced Nanostructures
Ion Microscopy
g.hlawacekAthzdr.de
Phone: +49 351 260 3409
+49 351 260 2411

Ion Induced Nanostructures

We study processes during the interaction of low energy (10 eV – 60 keV) ions with different charge states with materials, especially for the controlled modification and nano-patterning of their surfaces. Such modifications can be material removal through sputtering of surface atoms but also near surface ion beam mixing, ion beam induced defect engineering, or implantation of guest atoms (see figure below). Bottom up as well as top down surface structuring can be achieved through the use of either broad beam irradiation or focused ion beam irradiation.

The first one allows to roughen, smoothen, or clean technical surfaces. Furthermore, the energy deposited by the continuous ion impact drives the surface out of equilibrium inducing many processes on the surface and the sub-surface region.

  

Ioneninduzierte Oberflächenprozesse

Alternatively, focused ion beams allow the top down structuring of surfaces or surface near regions with a high spatial resolution compatible with modern nanostructure fabrication requirements. In our group we employ a wide range of focused ion beams from very light nobel gas ions to small heavy ion clusters to understand the behaviour of materials and create state-of-the-art nanostructures.

Main research topics:

Foto: liquid metal ion source ©Copyright: Dr. Lothar Bischoff

Focused Ion Beams

Information about the development and application of focused ion beams using liquid metal alloy ion sources

Helium Ion Microscopy

Information about Helium Ion Microscopy with special emphasis on the Orion NanoFab installed at the HZDR.
Foto: A silicon surface after 500 eV Ar+ sputtering under 67° ©Copyright: Dr. Stefan Facsko

Pattern formation by self-organization

Information about surface modification by low-energy ion irradiation and surface analytics by scanning probe techniques
Foto: Energy_barriers_XW_MP ©Copyright: Dr. Matthias Posselt

Compu­ter Simulations

Defects and diffusion
Foto: ArBlade - FWIZ-N Instrument ©Copyright: Dr. Nico Klingner

Setups - FWIZ-N

List of our setups for pre­paration, material modifications, analytical methods, and imaging.

Group information:

Group Members - Ion Induced Nanostructures

Current and former group members

Recent publications

Older publications can be found in the database (longer loading time)

2025

Programmable activation of quantum emitters in high-purity silicon with focused carbon ion beams

M. Hollenbach, N. Klingner, P. Mazarov, W. Pilz, A. Nadzeyka, F. Mayer, N. V. Abrosimov, L. Bischoff, G. Hlawacek, M. Helm, G. Astakhov

Involved research facilities

Related publications

Permalink: https://www.hzdr.de/publications/Publ-39025


2024

First principles study on stability, electronic and optical properties of 2D SbXY(X=Se/Te, Y=I/Br)Janus layers

A. E. Sudheer, A. Kumar, G. Tejaswini, M. Vallinayagam, M. Posselt, M. Zschornak, C. Kamal, M. Devaraj

Permalink: https://www.hzdr.de/publications/Publ-39937


Band alignment in CdS-α-Te van der Waals heterostructures for photocatalytic applications: Influence of biaxial strain and electric field

G. Tejaswini, A. E. Sudheer, M. Vallinayagam, M. Posselt, M. Zschornak, S. Maniprakash, M. Devaraj

Permalink: https://www.hzdr.de/publications/Publ-39936


Fabrication of palladium-enriched metallic structures by direct focused He+ and Ne+ beam nanowriting from organometallic thin films: a com- parison with Ga+ and e− beams

L. Herrer, A. Salvador-Porroche, G. Hlawacek, P. Cea, J. María De Teresa

Involved research facilities

Related publications

Permalink: https://www.hzdr.de/publications/Publ-39806


Focused electron beam induced deposition of magnetic tips for improved magnetic force microscopy

A. T. Escalante-Quiceno, V. V. Fernández, J. I. Martín, A. Hierro-Rodriguez, G. Hlawacek, M. Jaafar, A. Asenjo, C. Magén, J. M. de Teresa

Involved research facilities

Related publications

Downloads

Permalink: https://www.hzdr.de/publications/Publ-39804


Scalable Atomic Arrays for Spin-Based Quantum Computers in Silicon

A. M. Jakob, S. G. Robson, H. R. Firgau, V. Mourik, V. Schmitt, D. Holmes, M. Posselt, E. L. H. Mayes, D. Spemann, J. C. McCallum, A. Morello, D. N. Jamieson

Permalink: https://www.hzdr.de/publications/Publ-39597


Experimental and theoretical studies on self-diffusion in amorphous germanium

T. Böckendorf, J. Kirschbaum, F. Kipke, D. Bougeard, J. Lundsgaard-Hansen, A. Nylandsted-Larsen, M. Posselt, H. Bracht

Involved research facilities

Related publications

Permalink: https://www.hzdr.de/publications/Publ-39241


First principles investigation on structural and optoelectronic properties of newly designed Janus lead halides PbXY (X, Y = F, Cl, Br, I )

A. E. Sudheer, G. Tejaswini, M. Posselt, M. Devaraj

Downloads

Permalink: https://www.hzdr.de/publications/Publ-39240


Studies of the morphology of hematite synthesized from waste iron sulfate

K. Splinter, R. Möckel, G. Hlawacek, Z. Lendzion-Bielun

Permalink: https://www.hzdr.de/publications/Publ-39174


Tuning the Electronic Characteristics of Monolayer MoS2-Based Transistors by Ion Irradiation: The Role of the Substrate

Z. Fekri, P. Chava, G. Hlawacek, M. Ghorbani Asl, S. Kretschmer, W. Awan, V. Koladi Mootheri, N. Sycheva, A. George, A. Turchanin, K. Watanabe, T. Taniguchi, M. Helm, A. Krasheninnikov, A. Erbe

Involved research facilities

Related publications

Permalink: https://www.hzdr.de/publications/Publ-39152


Metalloid-doping in SMoSe Janus layers: first-principles study on efficient catalysts for the hydrogen evolution reaction

M. Vallinayagam, J. Karthikeyan, M. Posselt, M. Devaraj, M. Zschornak

Permalink: https://www.hzdr.de/publications/Publ-38900


Contribution of black carbon and desert dust to aerosol absorption in the atmosphere of the Eastern Arabian Peninsula

M. M. K. Mahfouz, G. Skok, J. Sciare, M. Pikridas, M. Rami Alfarra, S. Moosakutty, B. Alfoldy, M. Ivančič, M. Rigler, A. Gregorič, R. Podlipec, S. Lohmann, G. Hlawacek, R. Heller, E. Tutsak, G. Močnik

Involved research facilities

Related publications

Downloads

Permalink: https://www.hzdr.de/publications/Publ-38810


A low-kiloelectronvolt focused ion beam strategy for processing low-thermal-conductance materials with nanoampere currents

A. Wolff, N. Klingner, W. Thompson, Y. Zhou, J. Lin, Y. Xiao

Involved research facilities

Related publications

Permalink: https://www.hzdr.de/publications/Publ-38809


Ultralong-term high-density data storage with atomic defects in SiC

M. Hollenbach, C. Kasper, D. Erb, L. Bischoff, G. Hlawacek, H. Kraus, W. Kada, T. Ohshima, M. Helm, S. Facsko, V. Dyakonov, G. Astakhov

Involved research facilities

Related publications

Permalink: https://www.hzdr.de/publications/Publ-38750


Transport of dust across the Solar System: Constraints on the spatial origin of individual micrometeorites from cosmic-ray exposure

J. Feige, A. Airo, D. Berger, D. Brückner, A. Gärtner, M. Genge, I. Leya, F. Habibi Marekani, L. Hecht, N. Klingner, J. Lachner, X. Li, S. Merchel, J. Nissen, A. B. C. Patzer, S. Peterson, A. Schropp, C. Sager, M. D. Suttle, R. Trappitsch, J. Weinhold

Involved research facilities

Related publications

Permalink: https://www.hzdr.de/publications/Publ-38222


Defects distribution and evolution in selected-area helium ion implanted 4H-SiC

Y. Song, Z. Xu, M. Rommel, G. Astakhov, G. Hlawacek, F. Fang

Involved research facilities

Related publications

Downloads

Permalink: https://www.hzdr.de/publications/Publ-37512


An intermediate morphology in the patterning of the crystalline Ge(001) surface induced by ion irradiation

D. Erb, D. A. Pearson, T. Skeren, M. Engler, R. M. Bradley, S. Facsko

Involved research facilities

Related publications

Downloads

Permalink: https://www.hzdr.de/publications/Publ-36885