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Lambertian light trapping in thin crystalline macroporous Si layers
Author(s) -
Ernst Marco,
Brendel Rolf
Publication year - 2014
Publication title -
physica status solidi (rrl) – rapid research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.786
H-Index - 68
eISSN - 1862-6270
pISSN - 1862-6254
DOI - 10.1002/pssr.201308294
Subject(s) - trapping , materials science , absorption (acoustics) , optics , silicon , layer (electronics) , optoelectronics , physics , nanotechnology , ecology , biology
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)