NDLI: Light Output Enhancement of GaN-Based Light-Emitting Diodes by Optimizing SiO$_{2}$ Nanorod-Array Depth Patterned Sapphire Substrate

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Light Output Enhancement of GaN-Based Light-Emitting Diodes by Optimizing SiO$_{2}$ Nanorod-Array Depth Patterned Sapphire Substrate

Content Provider	Scilit
Author	Chiu, Ching-Hsueh Tu, Po-Min Chang, Shih-Pang Lin, Chien-Chung Jang, Chung-Ying Li, Zhen-Yu Yang, Hung-Chih Zan, Hsiao-Wen Kuo, Hao-Chung Lu, Tien-Chang Wang, Shing-Chung Chang, Chun-Yen
Copyright Year	2012
Description	Journal: Japanese Journal of Applied Physics In this study, we investigated high-efficiency InGaN/GaN light-emitting diodes (LEDs) grown on sapphire substrates with $SiO_{2}$ nanorod arrays (NRAs) of different heights. The GaN film showed an improved crystal quality through X-ray diffraction (XRD) full-width at half-maximum (FWHM), photoluminescence (PL), and cathodoluminescence (CL) measurements. The light output power and internal quantum efficiency (IQE) of the fabricated LEDs were increased when compared with those of conventional LEDs. Transmission electron microscopy (TEM) images suggested that the voids between $SiO_{2}$ nanorods and the stacking faults introduced during the nanoscale epitaxial lateral overgrowth (NELOG) of GaN can effectively reduce the threading dislocation density (TDD). We believe that the improvements could be attributed to both the enhanced light extraction by utilizing $SiO_{2}$ NRAs and the improved crystal quality through the NELOG method. We found that the sample with $SiO_{2}$ NRA structures of 200 nm height can increase the LED output power by more than 70% in our study.
Related Links	http://pdfs.semanticscholar.org/27f2/e58d272975541da4355933e6669988debb6f.pdf http://iopscience.iop.org/article/10.1143/JJAP.51.04DG11/pdf
ISSN	00214922
e-ISSN	13474065
DOI	10.1143/jjap.51.04dg11
Journal	Japanese Journal of Applied Physics
Issue Number	4S
Volume Number	51
Language	English
Publisher	IOP Publishing
Publisher Date	2012-04-20
Access Restriction	Open
Subject Keyword	Journal: Japanese Journal of Applied Physics Public, Environmental and Occupational Health
Content Type	Text
Resource Type	Article
Subject	Physics and Astronomy Engineering

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