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Proceedings Paper

Enhancement of light extraction in silicon-rich oxide light-emitting diodes by one-dimensional photonic crystal gratings
Author(s): J. M. Llorens; P. A. Postigo; J. Juvert; A. González; C. Domínguez
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Paper Abstract

In this work we show the design of one-dimensional nanophotonic structures (photonic crystal gratings) for enhancement of extraction of light with specific wavelengths in light-emitting diodes (LEDs). The LEDs are made of silicon-rich oxide embedding silicon nanolayers with emission in the visible spectrum. The LED structure consists of a poly-silicon top layer 310 nm thick, a silicon-rich oxide layer with nanoparticles and a silicon substrate. The gratings are formed by grooves separated with periods ranging from 200 nm to 600 nm and widths 0.72 times the period engraved on the top layer. We have performed two dimensional finite-difference time-domain simulations to obtain the values for the internal and external quantum efficiency (EQE) in the normal direction in a spectral window from 400 nm to 500 nm. The results show that it is possible to achieve a strong enhancement in the EQE in the short wavelength region (400 nm) while it reaches 5-fold enhancement at longer wavelengths.

Paper Details

Date Published: 11 September 2013
PDF: 6 pages
Proc. SPIE 8808, Active Photonic Materials V, 88080D (11 September 2013); doi: 10.1117/12.2023946
Show Author Affiliations
J. M. Llorens, IMM Instituto de Microelectrónica de Madrid (Spain)
P. A. Postigo, IMM Instituto de Microelectrónica de Madrid (Spain)
J. Juvert, IMB-CNM, CSIC (Spain)
A. González, IMB-CNM, CSIC (Spain)
C. Domínguez, IMB-CNM, CSIC (Spain)

Published in SPIE Proceedings Vol. 8808:
Active Photonic Materials V
Ganapathi S. Subramania; Stavroula Foteinopoulou, Editor(s)

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