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29. April 2015

EU funding strengthens solar cell research at HZB

The aim is to push the performance of solar cells towards 25 % conversion efficiency

Ultra-high vacuum system in the Energy Materials In-Situ Lab (EMIL) that will combine industry-relevant deposition tools with a suite of complementary advanced characterization methods. Credit: R.G. Wilks.
Ultra-high vacuum system in the Energy Materials In-Situ Lab (EMIL) that will combine industry-relevant deposition tools with a suite of complementary advanced characterization methods. Credit: R.G. Wilks.

Marcus Bär and his team are participating in two international projects being funded under the EU Horizon 2020 research programme. Both research projects are concerned with development and optimisation of high-efficiency thin-film solar cells based on chalcopyrites (“Sharc 25") and kesterites (“SWInG”). These two projects will together bring in about 900,000 EUR of additional research funding for solar cell research.

The two projects, Sharc25 and SWInG, will be funded under the EU’s Low-Carbon Energy section. “The advanced material characterisation at HZB will focus on the interface characteristics of solar cell structures. Particularly, the complementarity of the suite of instruments at the newly established EMIL lab at BESSY II will benefit this research”, explains Prof. Marcus Bär, who heads the Young Investigator Group - Interface Design at HZB.

“Sharc25" stands for “Super High-Efficiency Cu(In,Ga)Se2 Thin-Film Solar Cells Approaching 25%”. The project will focus on pushing the performance of Cu(In,Ga)Se2 (CIGSe) thin-film solar cells towards 25 % conversion efficiency, which is considerably higher than the efficiency of market-dominating polycrystalline silicon cells. Achieving this level of efficiency would provide a significant competitive advantage for the European thin film PV industry. The research project will be coordinated by the Centre for Solar Energy and Hydrogen Research Baden-Württemberg (ZSW) and involves research partners from seven European countries. The project funding is 6.15 million EUR in total, of which 450,000 EUR is allocated to HZB. “We will be systematically investigating the layer stacks, particularly focusing on understanding the properties and processes at the interfaces. Optimising the interface behaviour is a fundamental prerequisite for driving the efficiency towards its theoretical limit”, says Bär.

SWInG (Development of Thin-Film Solar Cells based on Wide Band-Gap Kesterite Absorbers) is to receive 3.8 million EUR and will be coordinated by imec (Interuniversity Micro-Electronics Centre/Belgium) and includes partners from the Netherlands, France, Germany, and Sweden. 450,000 EUR are allocated to HZB. The objective of the research is to develop inexpensive, dependable tandem solar cells that have the potential of converting more than 30% of sunlight into electricity. The wide band-gap solar cell absorbers necessary for this will be achieved by modifying the composition of the kesterite. “Kesterite absorber layers are desirable, because they consist of Earth-abundant elements. In addition, the band gap can be adjusted by varying the composition of the material, matching it to the requirements of the tandem solar cell”, explains Bär.

More information:

Prof. Dr. Marcus Bär
Helmholtz-Zentrum Berlin
Young Investigator Group Interface Design
Tel.: (030) 8062-43824 oder -42477
Email: marcus.baer(at)helmholtz-berlin.de

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The development of the Science and Technology Park Berlin Adlershof was and is co-financed by the European Union namely by EFRE. This concerns infrastructure development like construction of technology centres. Furthermore EFRE is used for international projects.

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