Weber group picture

Stefan AL Weber

Stefan Weber

Stefan studied Physics at the University of Konstanz. Already as an undergrad studentin he started to work with an SFM in the group of Prof. Leiderer. For his diploma thesis under the supervision of Prof. Dr. Johannes Boneberg he studied the interaction of gold nanoparticles with pulsed laser light.

In his PhD thesis in the group of Prof. Hans-Jürgen Butt/Dr. Rüdiger Berger at the Max Planck Institute for Polymer Reaearch (MPI-P), Mainz, he used and developed electrical scanning force microscopy methods for the investigation of organic optoelectronic materials. The project was embedded in the international research training group (IRTG) "Self-organizing materials for optoelectronics" - a joint graduate school between University and MPI-P in Mainz and the Seoul National University (SNU) and Hannam University Daejon in South Korea. In 2009 and 2010 he spent 6 months at SNU in the groups of Prof. Kookheon Char and Prof. Changhee Lee. In 2010 he received a joint doctoral degree from Mainz University and SNU.

In 2011 he went to University College Dublin as a Feodor Lynen Fellow (Alexander von Humboldt Foundation). Together with Prof. Brian Rodriguez and Prof. Suzi Jarvis he developed a new method for mapping surface potentials in liquid electrolytes. Here, he could demonstrate that atomic scale imaging is possible even in very viscous media.

In 2012 he became a project leader in the Physics of Interfaces group in the department of Prof. Hans-Jürgen Butt at the Max Planck Institute for Polymer Research (MPI-P), Mainz. In 2015 he was appointed as a junior professor in the Physics department of Mainz University. Curriculum vitae.

Next to force microscopy, Stefan Weber is a passionate photographer and member of the university choir Mainz.

Stefan Weber is a very common name. In case you were looking for someone else, you might find him here.


Dr Amy Stetten

my Stetten

Amy did her Bachelors in physics at Barnard College of Columbia University in Manhattan. For her Masters and Ph.D., she joined the multidisciplinary group of Drs. Stephen Garoff, Robert Tilton, and Todd Przybycien in the Physics and Chemical Engineering departments at Carnegie Mellon University in Pittsburgh, Pennsylvania. Her graduate work focused on capillary and transport phenomena of liquid drops on miscible liquid subphases. This work included two main topics: phospholipid-induced Marangoni transport for enhanced drug delivery in the lung, and the investigation of effective interfacial tensions between miscible fluid phases.

Now a postdoc in Stefan's lab, she combines her background in capillary physics with this group's expertise in electronics and KPFM to study charge separation between liquid drops and solid surfaces.

In her spare time, Amy enjoys indulging her artistic side by singing opera and making jewelry.

PhD Students

Amelie Axt

Amelie Axt

Amelie studied Physics in Mainz. For her bachelor thesis she investigated the influence of high-frequency magnetic fields on domain walls in ring structures on a micrometer length scale in the Kläui Group at the Institute of Physics in Mainz. Before starting her masters thesis in Stefan's group she joined the group of David Haviland at the KTH in Stockholm for an internship, learning a new multi-frequency SFM technique called intermodulation. For her masters thesis she further investigated this method for force field mapping at solid-liquid interfaces. In her PhD she wants to extend these methods to open-loop KPFM methods for mapping electrical potentials at solid-liquid interfaces.

Besides her activities in university sports she has a passion for painting and drawing.

Ilka Hermes

Ilka Hermes

Ilka studied Chemistry in Mainz. For her diploma thesis she investigated solvation structures on different mineral surfaces with high-resolution AFM in the Kühnle group in Chemistry department of Mainz university. For her PhD she joined Stefan's group to investigate ferroic structures in hybrid perovskite films and their effect on charge carrier dynamics.

Ilka is envied for her impeccable taste in music and cheese.

Since May 2019 she is working for Park AFM as a principle scientist.

Kostas Bidinakis


Kostas studied Chemistry in Athens before moving to Imperial College London to do his Master's.

In January 2020 he started his PhD in Stefan's group on cross-sectional KPFM on perovskite solar cells.

Yenal Yalçınkaya


Yenal studied Materials Science and Engineering at Gebze Technical University in Kocaeli/Turkey.

In March 2020, he started his PhD in Stefan's group. He is working in the DFG SPP 2196 "Perovskite semiconductors: From fundamental properties to devices".


Pravash Bista

Pravash Bista

Pravash Bista is our best friend from Nepal. Since August 2018, he has been working as a research assistant in Stefan Weber's group and has finished his Bachelor thesis in the nanoscale degradation of perovskite thin films in Spring 2019. Since spring 2020 he is doing his Master thesis on slide electrification of water droplets on hydrophobic surfaces.

Besides studies, he is also a good table tennis player and tries to spend most of his free time with his friends. Singing and traveling are some of his hobbies.

Pascal Rohrbeck

Pascal Rohrbeck

Pascal is our Chemistry expert from the "other side of the Rhine". In his Master thesis, he investigates the nanoscale electrical response of photovoltaic perovskite films with time-resolved KPFM.

Ravi Gowdru Manjunata


Ravi studied Physics in india before he came to Mainz for his M.Sc in Physics. He currently investigates the nanoscale stucture and mechanical properties of cellulose nanofibres.

Thomas Gries


Thomas studied Chemistry at the Free University Berlin, before moving to ETH Zurich for his Master.

In June 2020 he joined Stefan's group for his Master thesis on lateral conductivity of perovskite films.

Jonas Paulus


Jonas did an apprenticeship as a chemical lab engineer in the Chemical department at JGU Mainz before deciding to study Physics. He joined the group for his bachelor thesis in May 2020 to develop a solar cell testing and characterization instrument.

In memoriam

Eduard Unger 1988 - 2018

Eduard Unger

On December 14th 2018, Eduard Unger died suddenly and unexpectedly.

Eduard studied Material Science at the University of Göttingen. During his master thesis he investigated the Planar-Hall-Effect and the Anisotropic Magneto Resistance in micro structured LaSrMnO3 thin films. For his PhD he moved to Mainz to investigate the role of defects in graphene on the THz conductivity under the joint supervision of Stefan and Dmitry Turchinovich at the MPI-P.

Eduard about himself: "He is feared for his mental confusion induced by lack of food. Don’t rely on any statements he makes during this period." This is how we will remember him - a great guy with a great sense of humour.

We all miss you.

Former members

Lukas Odenbreit

Lukas finished his bachelor thesis on the measurement of capillary waves on water in 2020.

Victor Bergmann

Victor finished his PhD thesis on the development of cross sectional KPFM on perovskite solar cells in 2020.

Since May 2017 he is working for Park AFM. Next to his many other activities, he is a successful innkeeper: Together with friends he started the Bar Gutleut in Mainz.

Leonard Winkelmann

Leonard finished his master thesis on the behavior of ferroelastic twin domains in perovskite crystals in 2019.

Christopher Gort

Chris finished his master thesis on time resolved KPFM methods applied on perovskite solar cells in 2019 and his bachelor thesis on the investigation of mixed perovskites in 2016.

Niklas Budinger

Niklas (II) finished his bachelor thesis on numerical simulations of ion dynamics in perovskite solar cells in 2017.

Niklas Tausendpfund

Niklas (I) finished his bachelor thesis on open- and closed loop Kelvin probe force mciroscopy in 2016.

Stanislav Khodorov

Stanislav did his bachelor thesis on self-organizing nano-catarpillar structures in 2015.