Lambertian light trapping in thin crystalline macroporous Si layers |
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Authors: | Marco Ernst Rolf Brendel |
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Affiliation: | 1. Institute for Solar Energy Research Hamelin (ISFH), 31860 Emmerthal, Germany;2. Department Solar Energy, Institute of Solid‐State Physics, Leibniz Universit?t Hannover, 30167 Hannover, GermanyPhone: +49 5151 999 100, Fax: +49 5151 999 400 |
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Abstract: | Lambertian light trapping is a benchmark for efficient light trapping. In this Letter we experimentally quantify the degree of Lambertian light trapping in a macroporous silicon layer. The optical absorption of the effective (26.7 ± 5.5) µm thick sample with randomly arranged pores yields a photogeneration corresponding to a maximum current density of (40.8 ± 0.4) mA cm–2 and thus achieves a fraction of 0.985 ± 0.012 of the current density expected from a Lambertian light trapping scheme. The measured spectrum of the escape reflectance is well described with an analytic model assuming a complete randomization of the directions of light propagation. (© 2014 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim) |
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Keywords: | light trapping porous materials silicon crystals thin films |
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