SPM-Lab

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The Scanning Probe Microscopy Laboratory was founded in 2017 by Alex Redinger in a framework of an FNR consolidator grant. 

The group focuses on the study of the surface of two types of thin film solar cells, namely Cu(In,Ga)Se2 (CIGSe) and hybrid organic inorganic perovskites, as well as 2D materials. We combine scanning probe microscopy techniques in ultra-high vacuum such as Scanning Tunneling Spectroscopy (STS) and Kelvin Probe Force Microscopy (KPFM) and photoluminescence imaging (PL/TRPL) to access the electrostatic and optoelectronic properties at the surface of semiconductors.

Latest News

  • 26/11/2021

Thibaut, our first group member successfully defended his PhD thesis entitled "Co-evaporation and scanning probe microscopy characterizations of hybrid halide perovskite thin films for solar cells". Congratulations Dr. Gallet ! Pictures can be found in the gallery.
  • 16/09/2021

Our collaboration (KPFM/STS on perovskites) with the Laboratory of Photomolecular Science at EPFL, and other groups, resulted in a published work in Energy & Environmental Science. You can read it here: https://pubs.rsc.org/en/content/articlelanding/2021/ee/d1ee02454j
Congratulations to everyone involved !
  • 15/07/2021

In July, we wecolmed our second PostDoc, Dr. Ajay Singh. He recently submitted his PhD at the Technical University of Munich, Germany. He will work on applying novel growth and characterization techniques to produce highly efficicent halide perovskite solar cells via multi-stage co-evaporation. Good luck to him !
  • 24/06/2021

Our paper on the impact of KPFM operation modes and environment on grain boundaries band bending in perovskite and CIGS is now out and published in Nano Energy. You can read it following this link: https://www.sciencedirect.com/science/article/pii/S2211285521005255Congratulations to everyone involved !
  • 22/06/2021

We are extremely happy that our group and research are featured in the #letzSCIENCE campaing of the Fonds Nationals de la Recherche ! A KPFM overlay of a perovskite absorber is displayed on larger 2m posters at all tram stations in Luxembourg and in selected buses !! Go read the story behind the image and have a augmented reality experience of solar energy : https://letzscience.fnr.lu/solar-energy-a-science-with-many-layers

Recent Publications

November 2021

Impact of metallic potassium post-deposition treatment on epitaxial Cu(In,Ga)Se2

Evandro M. Lanzoni, Omar Ramirez, Himanshu Phirke, Amala Elizabeth, Harry Mönig and Alex Redinger

Thin Film Solids, 1, 139002

 

October 2021

Near surface defects: Cause of deficit between internal and external open-circuit voltage in solar cells

Mohit Sood, Aleksander Urbaniak, Christian Kameni Boumenou, Thomas Paul Weiss, Hossam Elanzeery, Finn Babbe, Florian Werner, Michele Melchiorre and Susanne Siebentritt

Progress in Photovoltaics 2021

 

Roadmap on organic–inorganic hybrid perovskite semiconductors and devices

Lukas Schmidt-Mende, Vladimir Dyakonov, Selina Olthof, Feray Ünlü, Khan Moritz Trong Lê, Sanjay Mathur, Andrei D. Karabanov, Doru C. Lupascu, Laura M. Herz, Alexander Hinderhofer, Frank Schreiber, Alexey Chernikov, David A. Egger, Oleksandra Shargaieva, Caterina Cocchi, Eva Unger, Michael Saliba, Mahdi Malekshahi Byranvand, Martin Kroll, Frederik Nehm, Karl Leo, Alex Redinger ... and Claudia Draxl

APL Materials 9, 109202 2021

September 2021

Nanoscale interfacial engineering enables highly stable and efficient perovskite photovoltaics

Anurag Krishna, Hong Zhang, Zhiwen Zhou, Thibaut Gallet, Mathias Dankl, Olivier Ouellette, Felix T. Eickemeyer, Fan Fu, Sandy Sanchez, Mounir Mensi, Shaik M. Zakeeruddin, Ursula Rothlisberger, G. N. Manjunatha Reddy, Alex Redinger, Michael Grätzel and  Anders Hagfeldt

Energy & Environmental Science, 2021,14, 5552-5562

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