Heinzen et al. investigated the structure-driven ion transport in conjugated polymers with crown ether side chains. Read about her findings probing from the nano- to microscale, now in Chemistry of Materials!

Yesterday, we had the pleasure to visit the Swiss Free Electron Laser at the Paul Scherrer Institut in Aargau! We then enjoyed a lovely dinner alongside the Aare in Bern. Thank you to everybody involved for making this exceptional day possible!

We are very happy to announce our new PhD in the house! Kaishuai defended his thesis about temperature dependence of electrochemical reactions in organic mixed ionic–electronic conductors phenomenally. We are very proud of you and wish you all the best for the future Kaishuai!

Last week, Diego and Maxi traveled to beautiful Tuscany to attend the Gordon Research Conference on Electronic Processes in Organic Materials. They were able to connect with other students and PIs from the field through engaging poster sessions, talks and social activities. Thank you to all the organizers for this amazing conference!

In our new, more technical paper, we present our implementation of the B Matrix referencing scheme for Transient Absorption. The B Matrix suppresses white-light fluctuations and reduces noise in TA system, and thus benefits setups with successive nonlinear processes in the probe path. In our case, a 2080 nm beam seeds a YAG crystal for super continuum generation from 600–1700 nm, allowing gapless data acquisition in a single InGaAs-based camera. Now in Review of Scientific Instruments.

Natalie attended the MRS Spring Meeting 2026 in Honolulu and gave two invited talks about organics photocatalysis and highly doped polymers!

Last Friday, Gopika presented the first results of her PhD at the Swiss Photochemistry Symposium in Fribourg. Very well done Gopika! Anouk and Maxi joined as participants, and we had enriching discussions with the other members of the field based in Switzerland. Thanks a lot to the organizers for this wonderful event!

Tom van der Pol et al., report a new operation regime in BBL, a polymer deswelling driven by water expulsion owed to polymer-cation interactions upon n-type electrochemical doping. Congrats to the team, we are proud to have contributed with terahertz spectroscopy. Now in Nature Materials!

Why do some polymers tolerate high doping levels and keep increasing their conductivity, while others decay at similar doping levels? Our PhD student, Basil, explores this in his first paper as first author, now published in Advanced Materials.

Our PhD student Kaishuai Zhang attended the e-MRS spring 2026 conference where he delivered a talk on the dynamics of electrochromic switching in covalent organic frameworks.

Julien presented at SPIE photonics! He showed his first hyperspectral images of OECTs. The doping and dedoping can be monitored in the channel and on the transparent ITO electrodes at the same time. Time resolved images have also been acquired, giving a unique insight into the doping mechanisms governing the functioning of OECTs.

New PhD in the house! Last Wednesday, Isabelle successfully defended her PhD thesis on the spectroscopic investigation of doping in organic mixed ionic–electronic conductors. You did a fantastic job, and we are super proud of you! All the best for the future ahead of you, you will be missed here!

A warm welcome to Varun Subudhi who is joining as a Ph.D. student within the MSCA doctoral network FADOS. Varun completed his Integrated M.Sc. degree in Physics at NISER, Bhubaneswar, India, where he specialized in nanoelectronics and organic device physics. At FemtoMat, he will focus on charge transport in doped organic semiconductors using THz spectroscopy to bridge local and macroscopic behaviour. All the best for the start!

We are thrilled to announce our new publication by Priscila! She studied why P3HT outperforms more polar analogues in OECTs. Thanks to the groups of Sahika Inal and Christian Nielsen for the great collaboration on this project!

New PhD in the house! Last Friday, Cedric successfully defended his PhD thesis on excitation-energy and field-driven ultrafast charge processes in organic semiconductors! You did a great job, and we wish you all the best for the future!

Last week, Dimitra travelled to the MATSUS Fall Meeting in Valencia! There, she presented our research on mixed conductivity in electrochemically and chemically doped polymers and connected with the community! Thanks a lot Dimitra for the nice presentation!

We are happy to announce our new publication by Eva! She investigated the distance–resilient conductivity in p-doped polythiophenes and compared aliphatic and glycolated sidechains. Many thanks to the groups of Christian Müller and Martijn Kemerink for the collaboration on this project!

We are happy to announce that Gopika Suresh started her PhD with us in September! Gopika obtained her integrated BS–MS degree from IISER Thiruvananthapuram, India and she will join our photocatalysis subgroup, aiming to understand charge carrier dynamics that underpin photocatalytic activity. All the best for the start!

We have a new Bachelor student! Yunjeong joined our group in September after completing her Bachelor’s degree in Chemistry from Sogang University, Korea. She will investigate the dynamics of electrochemical doping with us. We wish you a good start!

Christian presented his spectro-electrochemical studies on the structure–property relationships in organic mixed ionic–electronic conductors (OMIECs). Congratulations for the inspiring talk!