Tiburtius Prize for Eike Köhnen
Eike Köhnen (center) was awarded with the Tiburtius Prize for his outstanding dissertation on tandem solar cells with perovskites. In the team of Prof. Steve Albrecht (left, TU Berlin and HZB) he was involved in several world records. Prof. Michael Lehmann (TU Berlin) gave the laudatory speech.
On Tuesday, 6 December 2022, Dr. Eike Köhnen received the Tiburtius Prize (First Place) for outstanding dissertations. Eike Köhnen has contributed to significantly increasing the efficiency of tandem solar cells made of perovskite and silicon, to the point of setting world records.
Eike Köhnen worked on so-called tandem solar cells, a new type of photovoltaic technology that promises significantly higher efficiencies. In Prof. Steve Albrecht's team (TU Berlin and HZB), he combined conventional silicon solar cells with a perovskite cell and analysed with state-of-the-art methods how losses can occur. These insights helped to increase the efficiency of such tandem solar cells to over 29 %. This value was an absolute world record for more than eight months.
Köhnen also obtained two patents as a PhD student. His thesis was assessed with the top mark summa cum laude. In Albrecht's team, Eike Köhnen was also active in science communication and maintained a lively Twitter account.
"The Tiburtius Prize is an outstanding recognition of this excellent dissertation and Eike's pioneering work in the development of solar cells," says Prof. Steve Albrecht, who supervised the PhD-thesis. Co-supervisor Prof. Bernd Rech, who heads the Helmholtz-Zentrum Berlin as scientific director, adds: "Eike Köhnen has played a major role in our internationally visible successes with tandem solar cells made of perovskite and silicon. I congratulate him on this fine award."
The award is named after Professor Joachim Tiburtius, who was Senator for National Education in Berlin from 1951 to 1963. The State Conference of Rectors and Presidents of Berlin Universities (LKRP) awards three prizes annually, as well as an additional three recognition prizes, to doctoral students at Berlin universities for outstanding dissertations
Title of the dissertation by Eike Köhnen: Optical and Electrical Optimization by Advanced Characterization of Monolithic Perovskite/Silicon Tandem Solar Cells.
HZB receives funding to make innovations usable more quickly
The Helmholtz Association has selected three new innovation platforms that will now be funded. HZB is involved in two of them: The Innovation Platform on Accelerator Technologies HI-ACTS is intended to open up modern accelerators for a wide range of applications, while the Innovation Platform Solar TAP is intended to bring new ideas from the laboratories of photovoltaics research more quickly into an application. In total, HZB will receive 4.2 million euros in grants from the Pact for Research and Innovation over the next three years.
Urban Innovation Forum 2023
Urban Innovation Forum UIF 2023 brings together a diverse group of urban innovators, thought leaders, entrepreneurs and advocates to explore how breakthroughs in urban tech can accelerate the sustainable transformation of urban spaces.
Join the Session on 30 March 2023
02:45 - 03:30 pm GREEN BUILDINGS & PROPTECH
How do we decarbonize the energy system of the building stock, infrastructure, and cities? How do we create Business showcases in a decentralized and sustainable energy generation. How do we reach the energy efficiency of residential and commercial buildings?
// Samira Aden, Helmholtz-Zentrum Berlin // Karolina Attspodina, WeDoSolar // Fabian Reetz, Everyone Energy //Gerrit Peters, Below2 // Moderation: Totinia Hörner
The UIF 2023 is a partner event of the Berlin Energy Transition Dialogue (BETD) from the Federal Goverment.
Green hydrogen: How photoelectrochemical water splitting may become competitive
Sunlight can be used to produce green hydrogen directly from water in photoelectrochemical (PEC) cells. So far, systems based on this "direct approach" have not been energetically competitive. However, the balance changes as soon as some of the hydrogen in such PEC cells is used in-situ for a catalytic hydrogenation reaction, resulting in the co-production of chemicals used in the chemical and pharmaceutical industries. The energy payback time of photoelectrochemical "green" hydrogen production can be reduced dramatically, the study shows.