Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

20.1%-efficient screen printed silicon solar cell with novel rear passivation layer

08.03.2012
The Institute for Solar Energy Research Hamelin (ISFH) in collaboration with SINGULUS TECHNOLOGIES AG increases the conversion efficiency of screen-printed silicon solar cells from today’s industry typical 17.0% to 18.5% to a record value of 20.1%, as confirmed by an independent measurement from the Fraunhofer ISE.
A novel ICP-AlOx / SiNy double layer at the rear side of the solar cell enables the improvement without applying a “selective emitter”. 20.1% is one of the highest efficiencies worldwide reported for industrial type silicon solar cells with screen-printed metallization (only Schott Solar and Q-Cells achieved higher efficiencies of 20.2%).

Two technological improvements enable the increased conversion efficiency. First, an ICP-AlOx/SiNy double layer passivates the rear surface of the solar cell. ICP stands for “Inductively Coupled Plasma”, which is a novel deposition method for AlOx developed at ISFH in cooperation with SINGULUS TECHNOLOGIES AG. SINGULUS is currently developing an integrated production solution for this passivation layer stack. The screen-printed aluminum on the cell’s rear side locally contacts the silicon wafer through line shaped contact openings formed by laser ablation. The modified cell rear improves reflection and reduces the charge carrier recombination which increases both the current and voltage of the solar cell.
Second, the cell front side is metallized using a “Print on Print” process, which results in a reduced contact finger width and hence less shadowing loss. This advanced screen printing process was optimized at ISFH in collaboration with DEK Solar, using their high accuracy Eclipse screen printing platform and precision screens. Beyond these innovations, the solar cell applies typical industrial processes, in particular a homogeneously phosphorus diffused emitter and a 156 x 156 mm2 large Czochralski (Cz) silicon wafer.

“This excellent result was achieved within the research project HighScreen funded by the German Federal Ministry of the Environment and also funded by our partners SolarWorld AG, Schott Solar AG, Solland Solar Cells GmbH, RENA GmbH und SINGULUS TECHNOLOGIES AG”, explains Dr. Thorsten Dullweber, head of the ISFH research group Solar Cell Production Processes. “Additionally, our collaboration with DEK Solar, Ferro Corporation and Heraeus GmbH accelerated the progress.” Prof. Dr. Rolf Brendel, Director of the ISFH, adds: “These technological innovations show the high potential to further reduce the costs of photovoltaic electricity.”

“The significant efficiency improvement demonstrated by the ICP-AlOx process further encourages SINGULUS in our strategy to offer an integrated production solution with ICP-AlOx for rear passivated solar cells”, explains Dr. Björn Roos, Product Manager Solar at SINGULUS TECHNOLOGIES AG.

About 80% of today’s industrially manufactured solar cells apply p-type silicon wafers in combination with screen printed metal contacts. Hence, efficiency improvements for this type of solar cell are highly relevant for the photovoltaic industry and represent an intensive field of research worldwide.

Dr. Roland Goslich | idw
Further information:
http://www.isfh.de/

Further reports about: DEK ISFH SINGULUS Solar Decathlon solar cells technologies

More articles from Power and Electrical Engineering:

nachricht Waste from paper and pulp industry supplies raw material for development of new redox flow batteries
12.10.2017 | Johannes Gutenberg-Universität Mainz

nachricht Low-cost battery from waste graphite
11.10.2017 | Empa - Eidgenössische Materialprüfungs- und Forschungsanstalt

All articles from Power and Electrical Engineering >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Neutron star merger directly observed for the first time

University of Maryland researchers contribute to historic detection of gravitational waves and light created by event

On August 17, 2017, at 12:41:04 UTC, scientists made the first direct observation of a merger between two neutron stars--the dense, collapsed cores that remain...

Im Focus: Breaking: the first light from two neutron stars merging

Seven new papers describe the first-ever detection of light from a gravitational wave source. The event, caused by two neutron stars colliding and merging together, was dubbed GW170817 because it sent ripples through space-time that reached Earth on 2017 August 17. Around the world, hundreds of excited astronomers mobilized quickly and were able to observe the event using numerous telescopes, providing a wealth of new data.

Previous detections of gravitational waves have all involved the merger of two black holes, a feat that won the 2017 Nobel Prize in Physics earlier this month....

Im Focus: Smart sensors for efficient processes

Material defects in end products can quickly result in failures in many areas of industry, and have a massive impact on the safe use of their products. This is why, in the field of quality assurance, intelligent, nondestructive sensor systems play a key role. They allow testing components and parts in a rapid and cost-efficient manner without destroying the actual product or changing its surface. Experts from the Fraunhofer IZFP in Saarbrücken will be presenting two exhibits at the Blechexpo in Stuttgart from 7–10 November 2017 that allow fast, reliable, and automated characterization of materials and detection of defects (Hall 5, Booth 5306).

When quality testing uses time-consuming destructive test methods, it can result in enormous costs due to damaging or destroying the products. And given that...

Im Focus: Cold molecules on collision course

Using a new cooling technique MPQ scientists succeed at observing collisions in a dense beam of cold and slow dipolar molecules.

How do chemical reactions proceed at extremely low temperatures? The answer requires the investigation of molecular samples that are cold, dense, and slow at...

Im Focus: Shrinking the proton again!

Scientists from the Max Planck Institute of Quantum Optics, using high precision laser spectroscopy of atomic hydrogen, confirm the surprisingly small value of the proton radius determined from muonic hydrogen.

It was one of the breakthroughs of the year 2010: Laser spectroscopy of muonic hydrogen resulted in a value for the proton charge radius that was significantly...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

ASEAN Member States discuss the future role of renewable energy

17.10.2017 | Event News

World Health Summit 2017: International experts set the course for the future of Global Health

10.10.2017 | Event News

Climate Engineering Conference 2017 Opens in Berlin

10.10.2017 | Event News

 
Latest News

Electrode materials from the microwave oven

19.10.2017 | Materials Sciences

New material for digital memories of the future

19.10.2017 | Materials Sciences

Physics boosts artificial intelligence methods

19.10.2017 | Physics and Astronomy

VideoLinks
B2B-VideoLinks
More VideoLinks >>>