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DPG

Berlin 2008 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 12: Photovoltaic

HL 12.3: Talk

Monday, February 25, 2008, 14:30–14:45, EW 202

Photonic intermediate layer for silicon tandem solar cells — •Andreas Bielawny1, Paul-Tiberiu Miclea1, Ralf Wehrspohn1, Seuong-Mo Lee2, Mato Knez2, Reinhard Carius3, Marian Lisca4, Carsten Rockstuhl4, and Falk Lederer41Martin-Luther Universität Halle-Wittenberg, Inst. für Physik, Mikro-MD, D-06120 Halle — 2Max-Planck-Inst. für Mikrostrukturphysik, D-06120 Halle, — 3Forschungszentrum Jülich, Inst. für Photovoltaik (IEF-5), D-52428 Jülich — 4Universität Jena, Dept. Physik, D-07743 Jena

The concept of incorporation of a 3D photonic crystal as diffractive spectral filter within a-Si/mc-Si tandem solar cells has been investigated as a promising application. Our intermediate reflective filter enhances the pathway of spectrally selected light within an amorphous silicon top cell in its spectral region of low absorption. From our previous work, we expect a significant improvement of the tandem's efficiency of about 1.2%(absolute). This increases efficiency for a typical silicon tandem cell from 11.2% to 12.4%, as a result of the optical current-matching of the two junctions. Our wavelength-selective optical element is a 3D-structured optical thin-film - prepared by self-organized artificial opal templates and finalized with atomic layer deposition techniques. The resulting samples are highly periodical thin-film inverted opals made of zinc-oxide. We compare recent experimental data on the optical properties with our simulations and photonic bandstructure calculations.

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