World Record Solar Cell with 44.7% Efficiency
World record solar cell with 44.7% efficiency, made up of four solar subcells based on III-V compound semiconductors for use in concentrator photovoltaics. ©Fraunhofer ISE
With a solar cell efficiency of 44.7%, scientists around Dr. Frank Dimroth at the Fraunhofer Institute for Solar Energy Systems ISE achieved a new world record for the conversion of sunlight into electricity. They used a new solar cell structure with four solar subcells, a new procedure called wafer bonding and optical components which concentrate the sunlight (Concentrated Photovoltaics CPV). Part of the cell structure was developed at the Helmholtz Zentrum Berlin in the research group of Prof. Thomas Hannappel, (now with Technical University Ilmenau). They developed methods to prepare critical interfaces and to avoid undesirable defects. SOITEC and CEA-Leti have as well contributed to this world record.
An efficiency of 44.7% was measured at a concentration of 297 suns. This indicates that 44.7% of the solar spectrum`s energy, from ultraviolet through to the infrared, is converted into electrical energy. Concentrator photovoltaics has the potential to achieve twice the efficiency of conventional PV power plants in sun-rich locations of the globe.
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.