Patented nanostructure for solar cells: Rough optics, smooth surface

The nanostructure for capturing light is imprinted on silicon oxide (blue) and then "levelled" with titanium oxide (green). HZB

“It is not enough simply to bring more light into the cell,” says Christiane Becker. Such surface structures can even ultimately reduce the efficiency by impairing the electronic properties of the material.

The idea that David Eisenhauer worked out as part of his doctorate in Becker's team sounds quite simple, but it requires a completely new approach: to produce a structure that behaves “optically rough” and scatters the light, but at the same time provides a “smooth” surface on which the silicon layer (the most important layer of the solar cell) can grow with virtually no defects.

The procedure consists of several steps: first, the researchers imprint an optimised nanostructure onto a still liquid silicon oxide precursor layer that is then cured with UV light and heat. This creates tiny, regularly arranged cylindrical elevations that are ideal for capturing light. However, the absorbing layer of crystalline silicon cannot grow flawlessly on this rough surface, so these structures have an unfavorable effect on the quality of the solar cell. In order to resolve this conflict, a very thin layer of titanium oxide is spin coated on top of the nanostructure in order to produce a relatively smooth surface on which the actual absorber material can be deposited and crystallized.

The coating has the descriptive name “SMART” for smooth anti-reflective three-dimensional texture. It reduces reflections and brings more light into the absorbing layer without impairing its electronic properties. The procedure is now patented.

Christiane Becker heads a Young Investigator Group at the HZB funded by the BMBF under the NanoMatFutur programme. As part of the BerOSE Joint Lab, she works closely with the Zuse Institute to use computer simulations for understanding the effects of nanostructuring on material properties.

Prof. Dr. Christiane Becker
Helmholtz-Zentrum Berlin
christiane.becker@helmholtz-berlin.de

Published in Scientific Reports (2017): Smooth anti-reflective three-dimensional textures for liquid phase crystallized silicon thin-film solar cells on glass; David Eisenhauer, Grit Köppel, Klaus Jäger, Duote Chen, Oleksandra Shargaieva, Paul Sonntag, Daniel Amkreutz, Bernd Rech & Christiane Becker

doi: 10.1038/s41598-017-02874-y

Media Contact

Dr. Antonia Rötger Helmholtz-Zentrum Berlin für Materialien und Energie GmbH

Weitere Informationen:

http://www.helmholtz-berlin.de/

Alle Nachrichten aus der Kategorie: Power and Electrical Engineering

This topic covers issues related to energy generation, conversion, transportation and consumption and how the industry is addressing the challenge of energy efficiency in general.

innovations-report provides in-depth and informative reports and articles on subjects ranging from wind energy, fuel cell technology, solar energy, geothermal energy, petroleum, gas, nuclear engineering, alternative energy and energy efficiency to fusion, hydrogen and superconductor technologies.

Zurück zur Startseite

Kommentare (0)

Schreib Kommentar

Neueste Beiträge

The key to proper muscle growth

When a muscle grows, because its owner is still growing too or has started exercising regularly, some of the stem cells in this muscle develop into new muscle cells. The…

Cell biology: Signal transduction without signal

– receptor clusters can direct cell movement Whether we smell, taste or see, or when adrenaline rushes through our veins, all of these signals are received by our cells via…

Retroviruses are re-writing the koala genome and causing cancer

Koalas are facing multiple environmental and health issues which threaten their survival. Along with habitat loss – accelerated by last year’s devastating bush fires – domestic dog attacks and road…

Partners & Sponsors