The Institute for Solar Energy Research Hamelin (ISFH) and the Institute for Electronic Materials and Devices (MBE) of the Leibniz University Hannover have successfully completed the joint-development project “CHIP” on industrial ion implanted n-type PERT (Passivated Emitter and Rear, rear Totally doped) solar cells. In CHIP, the driving mechanisms for the annealing of implant damage have been investigated scientifically with special attention on non-amorphizing boron and amorphizing BFx implants.
The Institute for Solar Energy Research Hamelin (ISFH) and the Institute for Electronic Materials and Devices (MBE) of the Leibniz University Hannover have successfully completed the joint-development project “CHIP” on industrial ion implanted n-type PERT (Passivated Emitter and Rear, rear Totally doped) solar cells.
The CHIP (Cost-efficient High-throughput Ion implantation for Photovoltaics) project was funded by the German Federal Ministry for Economic Affairs and Energy. In CHIP, the driving mechanisms for the annealing of implant damage have been investigated scientifically with special attention on non-amorphizing boron and amorphizing BFx implants.
The latter are highly relevant for the transfer of ion implantation into photovoltaics since PV implanters generally do not feature mass separators and therefore mainly implant BF2 rather than elementary boron.
The obtained insights into the annealing processes have been applied for processing of industrial n-type PERT cells within a very lean process flow: After double-side texturing of 156mm×156mm large n-type Cz wafers, the front-side was boron or BF2 implanted, and the rear-side was implanted with phosphorous.
Implant damage was annealed in a single high-temperature step (co-annealing), while the utilization of BF2 enabled a significant reduction of required temperature. After annealing, the front-side was passivated by an Al2O3/SiNx stack, and the rear side was passivated by SiNx. Subsequently, screen-print at the front and the rear and co-firing was performed. Silver consumption was minimized utilizing fine-line print.
The highest, independently confirmed efficiency of a cell with a boron implanted emitter, measured on a brass chuck, was 21.0% where Voc was 664.6 mV, Jsc was 39.8 mA/cm2, and FF was 79.3%. In-house measurements from front and rear side yielded a bifaciality factor of 97.3%.
The highest, independently confirmed efficiency of a cell with a BF2 implanted emitter, also measured on a brass chuck, was 20.6% where Voc was 657.6 mV, Jsc was 39.9 mA/cm2, and FF was 78.4%. In-house measurements from front and rear side yielded a bifaciality factor of 97.7%.
According to Dr. Robby Peibst, head of the project, the results show that ion implantation is an enabling and economical doping technology, and screen-print on n-type cells undergoes an evolutionary improvement comparable to that on p-type cells. The lean process flow, the high efficiency without LID and the high bifaciality makes n-type PERT a viable cell concept.
Dr. Roland Goslich | idw - Informationsdienst Wissenschaft
How protons move through a fuel cell
22.06.2017 | Empa - Eidgenössische Materialprüfungs- und Forschungsanstalt
Fraunhofer IZFP acquires lucrative EU project for increasing nuclear power plant safety
21.06.2017 | Fraunhofer-Institut für Zerstörungsfreie Prüfverfahren IZFP
Heatwaves in the Arctic, longer periods of vegetation in Europe, severe floods in West Africa – starting in 2021, scientists want to explore the emissions of the greenhouse gas methane with the German-French satellite MERLIN. This is made possible by a new robust laser system of the Fraunhofer Institute for Laser Technology ILT in Aachen, which achieves unprecedented measurement accuracy.
Methane is primarily the result of the decomposition of organic matter. The gas has a 25 times greater warming potential than carbon dioxide, but is not as...
Hydrogen is regarded as the energy source of the future: It is produced with solar power and can be used to generate heat and electricity in fuel cells. Empa researchers have now succeeded in decoding the movement of hydrogen ions in crystals – a key step towards more efficient energy conversion in the hydrogen industry of tomorrow.
As charge carriers, electrons and ions play the leading role in electrochemical energy storage devices and converters such as batteries and fuel cells. Proton...
Scientists from the Excellence Cluster Universe at the Ludwig-Maximilians-Universität Munich have establised "Cosmowebportal", a unique data centre for cosmological simulations located at the Leibniz Supercomputing Centre (LRZ) of the Bavarian Academy of Sciences. The complete results of a series of large hydrodynamical cosmological simulations are available, with data volumes typically exceeding several hundred terabytes. Scientists worldwide can interactively explore these complex simulations via a web interface and directly access the results.
With current telescopes, scientists can observe our Universe’s galaxies and galaxy clusters and their distribution along an invisible cosmic web. From the...
Temperature measurements possible even on the smallest scale / Molecular ruby for use in material sciences, biology, and medicine
Chemists at Johannes Gutenberg University Mainz (JGU) in cooperation with researchers of the German Federal Institute for Materials Research and Testing (BAM)...
Germany counts high-precision manufacturing processes among its advantages as a location. It’s not just the aerospace and automotive industries that require almost waste-free, high-precision manufacturing to provide an efficient way of testing the shape and orientation tolerances of products. Since current inline measurement technology not yet provides the required accuracy, the Fraunhofer Institute for Laser Technology ILT is collaborating with four renowned industry partners in the INSPIRE project to develop inline sensors with a new accuracy class. Funded by the German Federal Ministry of Education and Research (BMBF), the project is scheduled to run until the end of 2019.
New Manufacturing Technologies for New Products
19.06.2017 | Event News
13.06.2017 | Event News
13.06.2017 | Event News
22.06.2017 | Life Sciences
22.06.2017 | Materials Sciences
22.06.2017 | Materials Sciences