At the 37th IEEE Photovoltaic Specialist Conference, which took place in Seattle in June 2011, ISFH and Q-Cells already presented small n-type EWT solar cells with an efficiency of 21.6% and an area of (20 × 20) mm2. The cell process is based on monocrystalline Czochralski n-type silicon.
The novel n-type EWT solar cell with 21% efficiency. Foto: ISFH
The high efficiency EWT solar cell.
The boron-doped emitter is defined with laser structuring and is passivated optimally with an aluminumoxide-siliconnitride double layer. ISFH has now scaled up the solar cell production processes to large wafer formats. A novel back contact design with four busbars has been developed, which reduces the finger length to about 50 mm and makes it possible to realize on this large cell area a metalization with a solar cell resitivity contribution less than 0.5 Ohm·cm2.
The project team at ISFH with project manager Till Brendemühl and the R&D team at Q-Cells SE are particularly pleased with the performance of the best (156 × 156) mm2 area solar cell, which has an efficiency of 21.0%, a Jsc of 40.5 mA/cm2, a Voc of 667 mV, and a fill factor of 77.7%.
“This cell type still has the potential for further improvements. We are confident to reach even higher efficiencies” says physicist Fabian Kiefer, who is developing back-contacted solar cells as part of his PhD thesis.
“Our goal is to simplify the production process significantly, while keeping the efficiencies above 21.0% on large cell area” says Prof. Dr. Nils-Peter Harder, head of the group.
Dr. Roland Goslich | idw
Researchers produce synthetic Hall Effect to achieve one-way radio transmission
13.09.2019 | University of Illinois College of Engineering
Penn engineers' new topological insulator reroutes photonic 'traffic' on the fly
13.09.2019 | University of Pennsylvania
Researchers from the Department of Atomically Resolved Dynamics of the Max Planck Institute for the Structure and Dynamics of Matter (MPSD) at the Center for Free-Electron Laser Science in Hamburg, the University of Hamburg and the European Molecular Biology Laboratory (EMBL) outstation in the city have developed a new method to watch biomolecules at work. This method dramatically simplifies starting enzymatic reactions by mixing a cocktail of small amounts of liquids with protein crystals. Determination of the protein structures at different times after mixing can be assembled into a time-lapse sequence that shows the molecular foundations of biology.
The functions of biomolecules are determined by their motions and structural changes. Yet it is a formidable challenge to understand these dynamic motions.
At the International Symposium on Automotive Lighting 2019 (ISAL) in Darmstadt from September 23 to 25, 2019, the Fraunhofer Institute for Organic Electronics, Electron Beam and Plasma Technology FEP, a provider of research and development services in the field of organic electronics, will present OLED light strips of any length with additional functionalities for the first time at booth no. 37.
Almost everyone is familiar with light strips for interior design. LED strips are available by the metre in DIY stores around the corner and are just as often...
Later during this century, around 2060, a paradigm shift in global energy consumption is expected: we will spend more energy for cooling than for heating....
Researchers from the Department of Atomically Resolved Dynamics of the Max Planck Institute for the Structure and Dynamics of Matter (MPSD) at the Center for Free-Electron Laser Science in Hamburg, the University of Potsdam (both in Germany) and the University of Toronto (Canada) have pieced together a detailed time-lapse movie revealing all the major steps during the catalytic cycle of an enzyme. Surprisingly, the communication between the protein units is accomplished via a water-network akin to a string telephone. This communication is aligned with a ‘breathing’ motion, that is the expansion and contraction of the protein.
This time-lapse sequence of structures reveals dynamic motions as a fundamental element in the molecular foundations of biology.
Two research teams have succeeded simultaneously in measuring the long-sought Thorium nuclear transition, which enables extremely precise nuclear clocks. TU Wien (Vienna) is part of both teams.
If you want to build the most accurate clock in the world, you need something that "ticks" very fast and extremely precise. In an atomic clock, electrons are...
10.09.2019 | Event News
04.09.2019 | Event News
29.08.2019 | Event News
17.09.2019 | Materials Sciences
17.09.2019 | Health and Medicine
17.09.2019 | Ecology, The Environment and Conservation