Regensburg 2007 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 5: Photovoltaic
HL 5.2: Talk
Monday, March 26, 2007, 11:15–11:30, H14
Spectrally Selective Photonic Structures for Photovoltaic Applications — •Andreas Bielawny1, Andreas von Rhein2, Ralf Boris Wehrspohn1, Rheinhard Carius3, Carsten Rockstuhl4, Marian Lisca4, and Falk Lederer4 — 1Institute of Physics, AG Wehrspohn, MLU Halle-Wittenberg, Heinrich-Damerow-Str. 4, D-06120 Halle, Germany — 2Dept. Physics, University of Paderborn, D-33095 Paderborn, Germany — 3Institute for Photovoltaics, Research Center Juelich, D-52425 Juelich, Germany — 4Dept. Physics, University of Jena, D-07743 Jena, Germany
One of the most appealing and lasting applications for photonics is photovoltaic (PV) energy conversion. While significant successes in material research and cell design were reported, photon management basically relies thus far on empirically obtained random rough surfaces.
We present a novel concept to incorporate a photonic crystal material with tailored properties into a photovoltaic tandem solar cell, causing two desirable effects. Firstly, our structure acts as a spectrally selective filter (according to the designed photonic stop-gaps) between PV-junctions of different electronic bandgaps: this increases multi-gap efficiency. Secondly, the periodicity of the photonic crystal provides diffraction of light into higher orders, which results in an enlargement of the optical path inside a PV-cell. This increases absorption and allows to improve current output or for the employment of even thinner cells. We present our work on photon management in a silicon-tandem cell with simulations based on experimental data, showing significant increase of the tandem cell's efficiency.