Nonpolar and semipolar GaN heteroepitaxy on sapphire for LED application

Qian Sun; Jung Han

doi:10.1117/12.847425

11 February 2010 Nonpolar and semipolar GaN heteroepitaxy on sapphire for LED application

Qian Sun, Jung Han

Proceedings Volume 7617, Light-Emitting Diodes: Materials, Devices, and Applications for Solid State Lighting XIV; 761717 (2010) https://doi.org/10.1117/12.847425
Event: SPIE OPTO, 2010, San Francisco, California, United States

Abstract

There has been increasing research interest in nonpolar and semipolar GaN for high brightness lightemitting application. Due to the very limited supply of GaN bulk substrates, the feasible way of obtaining large-area nonpolar and semipolar GaN material is still through heteroepitaxy on foreign substrates at present. This paper highlighted the major challenges in the heteroepitaxy of nonpolar and semipolar GaN on sapphire and presented the progress in reducing the defect density by a two-step growth technique according to the in situ optical reflectance and the ex situ x-ray analyses and transmission electron microscopy measurements. A defect reduction model was proposed based on the correlation between the morphological evolution and the microstructural development during the two-step growth of nonpolar aplane GaN. The material research status of nonpolar and semipolar GaN was summarized. A promising approach (orientation controlled epitaxy) was pointed out for a further improvement of nonpolar and semipolar GaN material quality.

Citation Download Citation

Qian Sun and Jung Han "Nonpolar and semipolar GaN heteroepitaxy on sapphire for LED application", Proc. SPIE 7617, Light-Emitting Diodes: Materials, Devices, and Applications for Solid State Lighting XIV, 761717 (11 February 2010); https://doi.org/10.1117/12.847425

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available