Comparing directed efficiency of III-nitride nanowire light-emitting diodes

Jordan Chesin; Silvija Gradecak

doi:10.1117/1.JNP.8.083095

13 February 2014 Comparing directed efficiency of III-nitride nanowire light-emitting diodes

Jordan Chesin, Silvija Gradecak

Author Affiliations +

Journal of Nanophotonics, Vol. 8, Issue 1, 083095 (February 2014). https://doi.org/10.1117/1.JNP.8.083095

Abstract

III-nitride-based nanowires are a promising platform for solid-state lighting. III-nitride nanowires that act as natural waveguides to enhance directed extraction have previously been shown to be free of extended defects even on foreign substrates, such as silicon. While the efficiency of nanowire-based light-emitting diodes (LEDs) has been investigated, there has yet to be a comparison of heterostructures based on nanowires grown in different crystallographic directions. We compared the directed external quantum efficiency (EQE) of III-nitride LEDs on silicon based on axial and radial nanowire heterostructures, considering m- and c -directional nanowires. The directed extraction efficiency was calculated using photonic simulations, and the internal quantum efficiency (IQE) was estimated using the A-B-C model. We found that m -directional axial heterostructures have the highest directed extraction efficiency, due to the strong polarization anisotropy of III-nitrides, and display similar IQE as c -directional axial heterostructures. By combining IQE and directed extraction, a range of directed expected EQEs reveal that m-directional axial heterostructures have EQEs up to three times that of c -directional axial heterostructures, providing guidelines for the design of future nanowire-based LEDs.

Citation Download Citation

Jordan Chesin and Silvija Gradecak "Comparing directed efficiency of III-nitride nanowire light-emitting diodes," Journal of Nanophotonics 8(1), 083095 (13 February 2014). https://doi.org/10.1117/1.JNP.8.083095

Published: 13 February 2014

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