Jesper Wallentin

Our research concerns the intersection of nanoscience and X-ray science. We use X-rays to investigate nanostructured devices, and we develop nanostructures as X-ray detectors. We have a strong collaboration with the Nanomax beamline at MAX IV, and we also visit other synchrotrons for experiments. Most of the projects also involve colleagues in NanoLund, and we are frequent users of the Lund Nano Lab.

We can offer many kinds of different MSc and BSc thesis projects, focusing on X-ray analysis, data analysis or nanofabrication. Please contact Jesper for more information. You can find a non-exhaustive list of ideas for projects under the headline "Semiconductor nanostructure".

Bachelor and Master projects at the Division of Synchrotron Radiation Research

Ongoing Research Projects

• Growth of metal halide perovskite nanowires for X-ray detection applications
• Free-standing metal halide perovskite nanowires devices and heterostructures
• Nanostructured X-ray detectors and X-ray beam induced current (XBIC)
• Nanoscale coherent X-ray diffraction
• X-ray imaging of ferroic domains
• Phase contrast tomography

Publications

An updated and complete list of publications on Google Scholar.

A selected list of recent work (links will open publishers' websites):

• N. Lamers, Z. Zhang, I. G. Scheblykin, and J. Wallentin, "Gas-Phase Anion Exchange for Multisegment Heterostructured CsPb(Br1−xClx)3 Perovskite Nanowires"  Advanced Optical Materials 12, 2300435 (2024)
• L. A. B. Marçal, N. Lamers, S. Hammarberg et al., "Structural and chemical properties of anion exchanged CsPb(Br(1−x)Clx)3 heterostructured perovskite nanowires imaged by nanofocused x-rays"  Nanotechnology 35 (26), 265710 (2024)
• N. Anttu, Z. Zhang, and J. Wallentin, "Beyond ray optics absorption of light in CsPbBr3 perovskite nanowire arrays studied experimentally and with wave optics modelling"  Nanotechnology 35, 095203 (2023)
• H. Dierks, Z. Zhang, N. Lamers, and J. Wallentin, "3D X-ray microscopy with a CsPbBr3 nanowire scintillator" - Nano Res. (2023)
• Z. Zhang, N. Lamers, C. Sun, C. Hetherington, I. G. Scheblykin, and J. Wallentin, "Free-Standing Metal Halide Perovskite Nanowire Arrays with Blue-Green Heterostructures" - Nano Lett. (2022)
• Z. Zhang, H. Dierks, N. Lamers, C. Sun, K. Nováková, C. Hetherington, I. G. Scheblykin, and J. Wallentin, "Single-Crystalline Perovskite Nanowire Arrays for Stable X-ray Scintillators with Micrometer Spatial Resolution" - ACS Applied Nano Materials 5 (1), 881 (2022)
• D. Dzhigaev et al., "Three-dimensional coherent x-ray diffraction imaging of ferroelastic domains in single CsPbBr3 perovskite nanoparticles" - New J. Phys. 23 (6), 063035 (2021)
• L Chayanun et al., "Direct Three-Dimensional Imaging of an X-ray Nanofocus Using a Single 60 nm Diameter Nanowire Device" - Nano Letters 20 (11) 8326 (2020)
• L. A. B. Marcal et al., "In Situ Imaging of Ferroelastic Domain Dynamics in CsPbBr3 Perovskite Nanowires by Nanofocused Scanning X-ray Diffraction" - ACS Nano 14 (11), 15973 (2020)
• H. Dierks and J. Wallentin, "Experimental optimization of X-ray propagation-based phase contrast imaging geometry" - Opt. Express 28 (20), 29562-29575 (2020)
• S Hammarberg et al., "High resolution strain mapping of a single axially heterostructured nanowire using scanning X-ray diffraction" - Nano Res. 13 (9), 2460 (2020)
• L Chayanun et al.: "Nanoscale mapping of carrier collection in single nanowire solar cells using X-ray beam induced current" - J. Synchrotron Radiat. 26 (1) (2019)
• H. Wallander and J. Wallentin, "Simulated sample heating from a nanofocused X-ray beam" - J. Synchrotron Radiat. 24 (5) (2017)
• J. Wallentin et al., "Bending and twisted lattice tilt in strained core-shell nanowires revealed by nanofocused X-ray diffraction" - Nano Lett. 17 (7) (2017)
• J. Wallentin, M. Osterhoff, and T. Salditt, "In operando X-ray diffraction reveals electrically induced strain and bending in single nanowire device" -  Adv. Mater. 28 (9), 1788 (2016)