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 Researchers use light to remotely control curvature of plastics
23.03.2017 | North Carolina State University

nachricht TU Graz researchers show that enzyme function inhibits battery ageing
21.03.2017 | Technische Universität Graz

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: Giant Magnetic Fields in the Universe

Astronomers from Bonn and Tautenburg in Thuringia (Germany) used the 100-m radio telescope at Effelsberg to observe several galaxy clusters. At the edges of these large accumulations of dark matter, stellar systems (galaxies), hot gas, and charged particles, they found magnetic fields that are exceptionally ordered over distances of many million light years. This makes them the most extended magnetic fields in the universe known so far.

The results will be published on March 22 in the journal „Astronomy & Astrophysics“.

Galaxy clusters are the largest gravitationally bound structures in the universe. With a typical extent of about 10 million light years, i.e. 100 times the...

Im Focus: Tracing down linear ubiquitination

Researchers at the Goethe University Frankfurt, together with partners from the University of Tübingen in Germany and Queen Mary University as well as Francis Crick Institute from London (UK) have developed a novel technology to decipher the secret ubiquitin code.

Ubiquitin is a small protein that can be linked to other cellular proteins, thereby controlling and modulating their functions. The attachment occurs in many...

Im Focus: Perovskite edges can be tuned for optoelectronic performance

Layered 2D material improves efficiency for solar cells and LEDs

In the eternal search for next generation high-efficiency solar cells and LEDs, scientists at Los Alamos National Laboratory and their partners are creating...

Im Focus: Polymer-coated silicon nanosheets as alternative to graphene: A perfect team for nanoelectronics

Silicon nanosheets are thin, two-dimensional layers with exceptional optoelectronic properties very similar to those of graphene. Albeit, the nanosheets are less stable. Now researchers at the Technical University of Munich (TUM) have, for the first time ever, produced a composite material combining silicon nanosheets and a polymer that is both UV-resistant and easy to process. This brings the scientists a significant step closer to industrial applications like flexible displays and photosensors.

Silicon nanosheets are thin, two-dimensional layers with exceptional optoelectronic properties very similar to those of graphene. Albeit, the nanosheets are...

Im Focus: Researchers Imitate Molecular Crowding in Cells

Enzymes behave differently in a test tube compared with the molecular scrum of a living cell. Chemists from the University of Basel have now been able to simulate these confined natural conditions in artificial vesicles for the first time. As reported in the academic journal Small, the results are offering better insight into the development of nanoreactors and artificial organelles.

Enzymes behave differently in a test tube compared with the molecular scrum of a living cell. Chemists from the University of Basel have now been able to...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

International Land Use Symposium ILUS 2017: Call for Abstracts and Registration open

20.03.2017 | Event News

CONNECT 2017: International congress on connective tissue

14.03.2017 | Event News

ICTM Conference: Turbine Construction between Big Data and Additive Manufacturing

07.03.2017 | Event News

 
Latest News

Argon is not the 'dope' for metallic hydrogen

24.03.2017 | Materials Sciences

Astronomers find unexpected, dust-obscured star formation in distant galaxy

24.03.2017 | Physics and Astronomy

Gravitational wave kicks monster black hole out of galactic core

24.03.2017 | Physics and Astronomy

VideoLinks
B2B-VideoLinks
More VideoLinks >>>