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Proceedings Paper

PECVD grown SiN photonic crystal micro-domes for the light extraction enhancement of GaN LEDs
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Paper Abstract

In this work, the effect of introducing a photonic crystal network of silicon nitride (SiN) micro-domes on the backside of silver coated gallium nitride (GaN) based light emitting diodes (LEDs) was studied. First, sapphire side of the top emitting LEDs, which is the bottom surface of the LEDs, is coated with silver (Ag). Light emitted towards the sapphire substrate is reflected upwards to the top surface and the amount of light extracted from the LED is expected to increase. In an alternative approach, SiN micro-domes forming a two dimensional photonic crystal, 2 μm in diameter and 80 nm in height in average, are deposited on the light emitting surface of the device with a period of 2 μm. Coating the backside with Ag has increased the efficiency of a top emitting LED by 11%. By introducing the SiN photonic crystal onto the Ag backside coated sample, total internal reflection is reduced via scattering and the amount of light emitted has been increased by 30% at 5·104 mA/cm2. Integration of SiN micro-domes with Ag coating has significantly impacted light extraction which has been shown to increase the efficiency of GaN based LEDs. Fabrication process and the results are discussed in detail.

Paper Details

Date Published: 16 February 2020
PDF: 6 pages
Proc. SPIE 11280, Gallium Nitride Materials and Devices XV, 112800O (16 February 2020); doi: 10.1117/12.2547206
Show Author Affiliations
M. Genç, Tyndall National Institute (Ireland)
Sabancı Univ. (Turkey)
Ermaksan Optoelectronic R&D Ctr. (Turkey)
V. Sheremet, Bilkent Univ. (Turkey)
İ. Altuntaş, Cumhuriyet Univ. (Turkey)
İ. Demir, Cumhuriyet Univ. (Turkey)
E. Gür, Atatürk Univ. (Turkey)
S. Elagöz, Cumhuriyet Univ. (Turkey)
O. Gülseren, Bilkent Univ. (Turkey)
Ü. Özgür, Virginia Commonwealth Univ. (United States)
V. Avrutin, Virginia Commonwealth Univ. (United States)
H. Morkoç, Virginia Commonwealth Univ. (United States)
A. Aydınlı, Uludağ Univ. (Turkey)

Published in SPIE Proceedings Vol. 11280:
Gallium Nitride Materials and Devices XV
Hiroshi Fujioka; Hadis Morkoç; Ulrich T. Schwarz, Editor(s)

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