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One-Dimensional SiC Photonic Structures to Enhance the Efficiency of Systems with Silicon Solar Cells and Upconverters

: Herter, B.; Peters, M.; Janz, S.; Hermle, M.; Goldschmidt, J.C.

Volltext urn:nbn:de:0011-n-2210553 (557 KByte PDF)
MD5 Fingerprint: f92fec0c876bb14e8e792c8864a3fb4a
Erstellt am: 7.12.2012

European Commission:
26th European Photovoltaic Solar Energy Conference and Exhibition, EU PVSEC. Proceedings : 5th to 9th September 2011 at the CCH - Congress Centre and International Fair Hamburg in Germany
M√ľnchen: WIP-Renewable Energies, 2011
ISBN: 3-936338-27-2
European Photovoltaic Solar Energy Conference and Exhibition (EU PVSEC) <26, 2011, Hamburg>
Konferenzbeitrag, Elektronische Publikation
Fraunhofer ISE ()
Solarzellen - Entwicklung und Charakterisierung; Silicium-Photovoltaik; Farbstoff; Organische und Neuartige Solarzellen; Alternative Photovoltaik-Technologien; Photonenmanagement; Neuartige Konzepte

In silicon solar cells, photons with energies lower than the fixed bandgap of 1.12 eV are transmitted through the semiconductor material and do not contribute to current generation. This limitation can be overcome using an upconverting material below the solar cell, which transforms two or more low-energy photons into one highenergy photon, which can be utilized in the solar cell. Available efficient upconverters like NaYF4:Er, however, typically only work efficiently over a narrow wavelength range. The used spectral range can be enlarged with a second luminescent material, which absorbs over a wider spectral range and emits in the absorption range of the upconverter, a concept known as spectral concentration. In this paper, we investigate photonic structures for a special system applying both spectral and spatial concentration using fluorescent concentrators. The photonic structures ensure that all photons reach the part of the system where they can be used the most efficiently. We show that the required photonic structures can be realized with a one-dimensional stack of alternating layers of silicon carbides with different silicon to carbon ratios. We present results of the simulation and optimization of these photonic structures, as well as characterization of such structures produced in a PECVD process.