Enhancement of light extraction in silicon-rich oxide light-emitting diodes by one-dimensional photonic crystal gratings

J. M. Llorens; P. A. Postigo; J. Juvert; A. González; C. Domínguez

doi:10.1117/12.2023946

11 September 2013 Enhancement of light extraction in silicon-rich oxide light-emitting diodes by one-dimensional photonic crystal gratings

J. M. Llorens, P. A. Postigo, J. Juvert, A. González, C. Domínguez

Author Affiliations +

Proceedings Volume 8808, Active Photonic Materials V; 88080D (2013) https://doi.org/10.1117/12.2023946
Event: SPIE NanoScience + Engineering, 2013, San Diego, California, United States

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.

Citation Download Citation

J. M. Llorens, P. A. Postigo, J. Juvert, A. González, and C. Domínguez "Enhancement of light extraction in silicon-rich oxide light-emitting diodes by one-dimensional photonic crystal gratings", Proc. SPIE 8808, Active Photonic Materials V, 88080D (11 September 2013); https://doi.org/10.1117/12.2023946

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KEYWORDS

Light emitting diodes

External quantum efficiency

Silicon

Photonic crystals

Oxides

Neodymium

Quantum efficiency

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