Joint R&D with industrial partners in early stage of development

HySPRINT Logo printed with copper


The Helmholtz Innovation Lab HySPRINT at HZB is a platform for collaborations with industrial partners. HySPRINT deals with (opto)electronic materials and devices in an early stage of the technological development.


New highly efficient perovskite/silicon tandem solar cells presented at the PSCO-2019 conference


Recently, the researchers from the Young Investigator Group for perovskite tandem solar cells headed by Prof. Steve Albrecht have fabricated a novel perovskite/silicon tandem solar cell. The scientists implemented various modifications developed in the perovskite lab of the Helmholtz Innovation Lab HySPRINT, i.e.: precise interface engineering and the use of a self-assembled monolayer (SAM) hole transport material in the perovskite top cell. As a result, of these optimizations, the researchers gained 27.5% power conversion efficiency (PCE) - the highest PCE among the research institutions.

Eike Köhnen has presented this outcome at the Perovskite Solar Cells and Optoelectronics (PSCO-2019 [1]) conference in Lausanne, Switzerland. High practical interest of the topic and further improvements stimulated interesting questions and intensive discussion from the conference audience.


Soda-lime glasses as low-cost substrates for multi crystalline silicon thin films 


Liquid phase crystallization (LPC) of silicon is a promising technology platform to grow multi crystalline silicon thin films on foreign substrates and is actively developed at Helmholtz-Zentrum Berlin (HZB). Although, parameters of solar cells based on the LPC-grown silicon layers are constantly improving, the cost factor of the utilized substrates has been given little attention. The recent study performed in the Helmholtz innovation laboratory HySPRINT at HZB focuses on the technology transfer from the well-established but cost intensive technical glass to low cost soda-lime glass (SLG) substrates. Despite a large difference in the expansion coefficient between SLG and silicon absorber layer, the scientists were able to fabricate adhesive silicon thin films under certain conditions. S.Kühnapfel, first author of the paper says, “Material quality and performance of the solar cells fabricated on top of these silicon layers are only ~30% less than of the cells on technical glass substrates.“ The researchers also suggest several solutions to advance the parameters of final devices that makes SLG very attractive for commercial application.

Figure: Adhesion properties of laser crystallized silicon on a soda-lime glass substrate ©HZB

Read the full text of the article “Multi crystalline silicon thin films grown directly on low cost soda-lime glass substrates” published in Solar Energy Materials and Solar Cells

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