| Directionally selective light trapping in a germanium solar cell. | |
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MedLine Citation:
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PMID: 21445215 Owner: NLM Status: In-Process |
Abstract/OtherAbstract:
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Restricting the angular range in which a photovoltaic system emits light, is a promising but rather unexplored approach to enhance conversion efficiency. In this paper we analyze and discuss the effect of a directionally selective filter on the absorption of light and the generation of charge carriers in a germanium solar cell. A directionally selective filter transmits photons of perpendicular incidence and reflects photons under oblique incidence in a given spectral range. To investigate its effect on light trapping, we perform reflection and quantum efficiency measurements. The reflection measurements show that a wavelength dependent absorption enhancement is induced by the application of the directionally selective filter. We calculate a maximum absorption enhancement of 45% at λ ≈ 1900 nm. We show that the absorption enhancement is caused by light trapping of non-absorbed and scattered light and is not due to a suppression of radiative processes. A trapping of photons generated by radiative recombination could not be detected. Measurements of the quantum efficiency confirm the results of the reflection measurements. The generation of charge carriers is increased by up to 33% at λ ≈1900 nm. A comparison of path length enhancement factors calculated from reflection and quantum efficiency measurements indicates a low parasitic absorption in the solar cell device. |
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Authors:
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Marius Peters; Carolin Ulbrich; Jan Christoph Goldschmidt; Jara Fernandez; Gerald Siefer; Benedikt Bläsi |
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Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: Optics express Volume: 19 Suppl 2 ISSN: 1094-4087 ISO Abbreviation: Opt Express Publication Date: 2011 Mar |
Date Detail:
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Created Date: 2011-03-29 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 101137103 Medline TA: Opt Express Country: United States |
Other Details:
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Languages: eng Pagination: A136-45 Citation Subset: IM |
Affiliation:
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1Fraunhofer Institute for Solar Energy Systems ISE, Heidenhofstraße 2, 79110 Freiburg, Germany. marius.peters@ise.fraunhofer.de |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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