Ramesh Kumar

Photo-Iontronics (π)

Exploring π-powered devices: where light, ions, and electrons meet

Dr. Ramesh Kumar

Alexander von Humboldt Research Fellow, Institute for Microsensors, Actuators and Systems, Uni-Bremen, Germany

& Visiting Postdoctoral Researcher at Ångström Laboratory, Uppsala University, Sweden

About me

I am currently an Alexander von Humboldt Research Fellow (2024–2026) at the Institut für Mikrosensoren, -aktoren und -systeme, University of Bremen, Germany. My research is focused on decoding ion dynamics in organic electrochemical transistors (OECTs)—a cutting-edge field bridging organic electronics and electrochemistry.

Previously, I held a postdoctoral position at Uppsala University, Sweden, in the Boschloo-Johansson group, where I worked on lead-free, perovskite-inspired materials for solar energy applications. My broader expertise lies in the design, fabrication, and fundamental characterization of perovskite-based optoelectronic and photovoltaic devices, as well as electrochemical electronic systems, including photo-supercapacitors and OECTs.

I employ small-perturbation frequency and time-domain techniques—such as Electrochemical Impedance Spectroscopy (EIS), Intensity Modulated Photocurrent/Voltage Spectroscopy (IMPS/IMVS), and Transient Photovoltage/Photocurrent (TPV/TPC)—to probe device physics and unravel performance-limiting factors.

To date, I have published 25+ peer-reviewed articles, authored three book chapters, secured one patent, and presented my work at numerous international conferences.

My academic journey includes higher education from premier Indian institutions, including Delhi University, NIT Jaipur, and IIT Roorkee. I have qualified several national-level competitive examinations, such as GATE (2016–2018) with a top rank of 500 and the CSIR-NET, securing an All India Rank of 100.

Honors and Fellowships

Young investigator group preparation grant, Karlsruhe Institute of Technology (KIT), Germany.
Alexander von Humboldt Research Fellowship, AvH Foundation, Germany (2024–2026).
Swedish Postdoctoral Fellowship, Olle Engkvist Foundation, Sweden (2023–2025).
Commonwealth Scholarship, UK Government (2021–2022).
PhD Scholarship, Government of India (2017-2022)
Travel Grants, IIT Roorkee 2020.

Latest Research articles (Postdoc work)

Research highlights @ Photo-Caps

Ph.D. Thesis Publications (Selected Articles)