• Welcome to just.science

    Researcher's website of Dr. Justus Just

  • just.science

  • Welcome to just.science

    Researcher's website of Dr. Justus Just

My Research

My research is driven by a dual passion: the curiosity for understanding complex processes on atomic-level and a commitment to leveraging this to advance energy materials for greener and more sustainable future.

I am focusing on understanding structure-function relations in multinary solid-state materials and their dynamics during phase formation and transformation processes.


• Phase formation and transformation processes

• structure-function relations, especially defects

in-situ X-ray Absorption Spectroscopy

in-situ Multimodal X-ray Analysis (XAS, XRD, XEOL)

• Energy Materials: Photovoltaics, Batteries, Catalysis

• Semiconductors

Recent Updates

Research Stay at Stanford University

I am looking forward to my coming research stay as visiting scholar with the group of Prof. Dauskardt in Material…

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Research Stay at Stanford University
International in-FORM Workshop held 8th and 9th of May 2023 in Lund

International in-FORM Workshop held 8th and 9th of May 2023 in Lund

We hosted the in-FORM workshop on in-situ Formation of Energy Materials held at MAX IV the 8th and 9th of…

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First sucessful multimodal in-situ experiments with the newly developed in-FORM coating device

We performed first in-situ coating experiments where we were able to follow the formation of metal-halide perovskites in-situ by means…

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First sucessful multimodal in-situ experiments with the newly developed in-FORM coating device

About me

Contact Information

Dr. Justus Just

My profile

To discover the dynamics of structure-function relations during material formation and transformation processes, m

Balder Beamline

Balder is dedicated to X-ray absorption spectroscopy (XAS) and X-ray emission spectroscopy (XES) in the medium and hard X-ray energy range, 2.4-40 keV. The high brilliance from the 3 GeV 4th generation storage ring in combination with the beamline design allows for simultaneous measurements of complementary X-ray techniques with nearly uncompromised data quality and to sub-second time resolution.

My particular interests are :

  • time-resolved real-time in-situ X-ray absorption spectroscopy (XAS)
  • XAS- based multimodal experiments with simultanous measurements of: X-ray diffraction (XRD) or X-ray excited optical luminescence (XEOL)

read more about the Balder beamline


With in-FORM we develop a synchrotron based in-situ material research platform to gain insight into the formation of functional materials during deposition. This platform consists of a slot-die coating and annealing system with atmosphere control and a suitably small foot-print as well as flexibility for integration into the Balder beamline at MAX IV.

Source: Swedish Foundation for Strategic Research (SSF-Works)

Period: 2019-2023

Total budget: 7.7 MSEK

XRD@Balder: Synchronously combined in-situ X-ray diffraction and X-ray absorption spectroscopy for new catalytic materials

The collaborative project between Balder and Chalmers University, Göteborg, is aiming to develop and implement (in-situ) X-ray diffraction capabilities simultaneously with X-ray spectroscopy in one experimental setup with sub-second time resolution. This project is framed in the exploration of new catalytic materials, their molecular function and ways to use them for environmental protection and chemical production without putting planetary boundaries for sustainability at risk.

Source: Chalmers University

Period: 2020-2024

Total budget: 5.5 MSEK

Key Publications

Multi-Stage Phase-Segregation of Mixed Halide Perovskites under Illumination: A Quantitative Comparison of Experimental Observations and Thermodynamic Models

K. Suchan, J. Just, P. Becker, C. Rehermann, A. Merdasa, R. Mainz, I. G. Scheblykin and E. L. Unger

Insights into Nucleation and Growth of Colloidal Quaternary Nanocrystals by Multimodal X-ray Analysis

J. Just, C. Coughlan, S. Singh, H. Ren, O. Müller, P. Becker, T. Unold, and K. M. Ryan

Optical in situ monitoring during the synthesis of halide perovskite solar cells reveals formation kinetics and evolution of optoelectronic properties

K. Suchan, J. Just, P. Becker, E. L. Unger and T. Unold

Depth distribution of secondary phases in kesterite Cu2ZnSnS4 by angle-resolved X-ray absorption spectroscopy

J. Just, D. Lützenkirchen-Hecht, O. Müller, R. Frahm, and T. Unold

Real-time observation of Cu2ZnSn(S,Se)4 solar cell absorber layer formation from nanoparticle precursors

R. Mainz, B. C. Walker, S. S. Schmidt, O. Zander, A. Weber, H. Rodriguez-Alvarez, J. Just, M. Klaus, R. Agrawal and T. Unold

Quick-EXAFS Setup at the SuperXAS Beamline for in Situ X-Ray Absorption Spectroscopy with 10 ms Time Resolution

O. Müller, M. Nachtegaal, J. Just, D. Lützenkirchen-Hecht and R. Frahm

20.8% Slot‐Die Coated MAPbI3 Perovskite Solar Cells by Optimal DMSO‐Content and Age of 2‐ME Based Precursor Inks

J. Li, J. Dagar, O. Shargaieva, M. A. Flatken, H. Köbler, M. Fenske, C. Schultz, B. Stegemann, J. Just, D. M. Többens, A. Abate, R. Munir and E. Unger