Abstract
Owing to the large lattice mismatch between Si and Al(Ga)N, GaN-based structures grown on Si(111) substrates usually have a high density of threading dislocations, which act as non-radiative recombination centers. In this work, we analyze the relationship between threading dislocations and the internal quantum efficiency of GaN-based light-emitting diodes (LEDs) by using various characterization methods such as atomic force microscopy, transmission electron microscopy, cathodoluminescence, photoluminescence, and electroluminescence measurements. Non-radiative recombination centers are found to have a direct effect on the optical properties of optoelectronics devices such as LEDs. Reducing the density of the threading dislocations is demonstrated to be a key parameter in improving the output power of LEDs grown on Si substrates.
Original language | English |
---|---|
Pages (from-to) | 1085-1088 |
Number of pages | 4 |
Journal | Journal of the Korean Physical Society |
Volume | 67 |
Issue number | 7 |
DOIs | |
Publication status | Published - 2015 Oct 1 |
Bibliographical note
Publisher Copyright:© 2015, The Korean Physical Society.
All Science Journal Classification (ASJC) codes
- General Physics and Astronomy