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Fraunhofer-Institut für Solare Energiesysteme ISE Heidenhofstraße 2 79110 Freiburg, Germany http://www.ise.fraunhofer.de
Contact Mr Dr. Frank Dimroth +49 761 45885258
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Fraunhofer-Institut für Solare Energiesysteme ISE

Vierfach-Solarzelle mit 43,6 Prozent Wirkungsgrad unter konzentriertem Licht

Neuartige Produktionstechnologie ermöglicht höhere Wirkungsgrade

(PresseBox) (Freiburg, )
In einem ambitionierten Industrieprojekt mit der französischen Firma SOITEC arbeitet das Fraunhofer ISE gegenwärtig an einer neuen Generation von Mehrfach-Solarzellen, die das Potenzial haben in Zukunft Wirkungsgrade bis zu 50 % unter konzentriertem Sonnenlicht zu erreichen. Hierzu werden anstelle der bisher gängigen Dreifach-Solarzellen, die aus Halbleitermaterialien der Gruppen III und V des Periodensystems bestehen - nun erstmals Vierfach-Solarzellen eingesetzt. Dabei werden zunächst zwei Tandemsolarzellen separat auf unterschiedlichen III-V Substraten abgeschieden und anschließend durch das so genannte Wafer-bond-Verfahren so fest miteinander verbunden, dass die Grenzfläche den Stromfluss durch die Vierfach-Solarzelle erlaubt. Mehrfach- Solarzellen finden ihren Einsatz in Konzentratorphotovoltaik- Kraftwerken.

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