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Solarzellen der Zukunft

Silber-Nanoteilchen steigern Lichtausbeute nach biologischem Vorbild

Im Licht steckt jede Menge Energie. Die Natur versteht seit langem, diese Energie in der Photosynthese effektiv zu nutzen. Wissenschaftlern um die Professoren Christoph Bräuchle und Hugo Scheer von der Ludwig-Maximilians-Universität (LMU) München ist es in Zusammenarbeit mit Forschern der Universität von Ohio gelungen, ihr dabei noch etwas auf die Sprünge zu helfen.

Rubrik: Science      Tag: Licht,Photovoltaik
Silber-Nanoinseln

Silber-Nanoinseln

Silber-Nanoteilchen steigern Lichtausbeute durch verstärken der Fluoreszenzintensität von PCP-Lichtsammelkomplexen.

© nano-initiative-munich.de   Lupe

Die Forscher haben gezeigt, dass sich mit Silber-Nanoteilchen die Effizienz von Lichtsammelkomplexen, den zentralen Funktionsträgern für das Einsammeln von Licht bei der Photosynthese, um den Faktor 18 steigern lässt. Diese Entdeckung, die in der 8. Ausgabe der Fachzeitschrift „Nano Letters“ veröffentlicht wurde, könnte bedeutsam für die Entwicklung neuartiger Solarzellen nach biologischem Vorbild sein. Die Natur hat im Laufe der Evolution mit der Entwicklung der Photosynthese und der daran beteiligten komplexen Proteine eine effektive Maschinerie entwickelt, die Sonnenlicht in elektrische Spannung und schließlich in chemische Energie umwandeln kann – eine Art natürliche Solarzelle.

Effizienz der Photosynthese

Für die Effizienz der Photosynthese haben so genannte Lichtsammelkomplexe eine zentrale Funktion. Bei der Photosynthese in bestimmten Meeres-Algen, den Dinoflagellaten, sind das zum Beispiel Peridinin-Chlorophyll-Protein-Komplexe, kurz PCP. Die PCP-Moleküle haben die Aufgabe, das in Wassertiefen von etwa zehn Metern recht schwache aber für die Algen lebensnotwendige blau-grüne Licht zu sammeln und zu den zentralen Photoreaktionszentren der Pflanze zu transportieren, in denen dann die eigentliche Umwandlung von Licht in chemische Energie stattfindet.

In einer Art Kaskade wird Lichtenergie von Peridinin-Molekülen absorbiert, an Chlorophyll-Moleküle weitergegeben und so letztlich bis in das Reaktionszentrum geleitet. Da die Photosynthese eine besonders effiziente Art der Umwandlung von Sonnenlicht in Energie darstellt, ist es naheliegend, die relativ teuren Solarzellen mit künstlichen Lichtsammelkomplexen zu versehen, um damit eine ähnliche Effektivität wie das natürliche Lichtsammler/Reaktionszentren-System zu erreichen. Erste Ansätze dazu wurden bereits in der Fachwelt diskutiert. Den Forschern gelang es nun durch Wechselwirkungen mit Silber-Nanopartikeln die optischen Eigenschaften des natürlichen Lichtsammelkomplexes PCP so zu verändern, dass das System noch effektiver Licht aufnehmen kann.

Wechselwirkung mit Silber-Nanopartikeln

Den Forschern gelang es nun durch Wechselwirkungen mit Silber-Nanopartikeln die optischen Eigenschaften des natürlichen Lichtsammelkomplexes PCP so zu verändern, dass das System noch effektiver Licht aufnehmen kann. Zur Messung haben die Forscher zunächst Silberinseln mit einem Durchmesser von etwa 80 Nanometern auf Deckgläser aufgebracht. Diese dienten als Unterlage für PCP-Komplexe aus Algen der Art Amphidinium carterae. Die PCP-Moleküle wurden mit Laserlicht im blau-grünen Wellenlängenbereich angeregt und fluoreszenzspektroskopisch untersucht. Das resultierende Mess-Signal zeigte sowohl bei einzelnen PCP-Molekülen als auch im Molekülverband eine bis zu 18-fache Verstärkung der Fluoreszenzintensität. Hinweise auf eine Änderung der Proteinstruktur wurden bei den Messungen nicht gefunden. Die Wissenschaftler schließen daraus, dass die PCP-Komplexe auch in Gegenwart der Silberinseln strukturell und funktionell intakt bleiben. Theoretische Modelle legen nahe, dass sich die Effizienzsteigerung vor allem mit einer Erhöhung der Anregungsrate durch eine verstärkte Absorption erklären lässt. Hinter dem Verstärkungsmechanismus steckt danach eine durch Plasmonen, das heißt durch Schwingungen der elektrischen Ladungsträger in den Silberinseln hervorgerufene Erhöhung der elektromagnetischen Strahlung im Inneren des PCP. Das PCP wird quasi auf zwei Arten angeregt: direkt über das Licht und indirekt über das erzeugte elektrische Feld der Nanoteilchen.

Steigerung der Lichtsammeleffizienz

Das Verfahren zur Steigerung der Lichtsammeleffizienz des PCP sollte sich nach Ansicht der Wissenschaftler direkt auf künstliche Lichtsammelkomplexe übertragen und durch gezielte Herstellung metallischer Nanostrukturen noch weiter optimieren lassen. Dies könnte ein wichtiger Beitrag zur Entwicklung neuartiger hocheffektiver Solarzellen sein. Aber auch die in der medizinisch-biologischen Forschung wichtige Methode der Spektroskopie einzelner Moleküle könnte von der Effizienzsteigerung profitieren. "Einzelmolekülforscher haben immer zu wenig Licht. Es wird immer nach Wegen gesucht, wie das Licht intensiver gemacht werden kann."


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