Regularly-patterned nanorod light-emitting diode arrays grown with metalorganic vapor-phase epitaxy
Journal
Superlattices and Microstructures
Journal Volume
83
Pages
329-341
Date Issued
2015
Author(s)
Tu, C.-G.
Su, C.-Y.
Liao, C.-H.
Hsieh, C.
Yao, Y.-F.
Chen, H.-T.
Lin, C.-H.
Chen, H.-S.
Kiang, Y.-W.
Abstract
Abstract The growth and fabrication of GaN nanorod (NR) light-emitting diode (LED) arrays have attracted much attention because of their advantages of higher crystal quality, larger sidewall emission area, and non-polar or semi-polar quantum well (QW) formation. In this paper, we review the development of regularly-patterned GaN NR LED arrays grown with metalorganic vapor-phase epitaxy. Such an array device is expected to be useful for practical lighting application. A regularly-patterned NR array is grown on a patterned template with either continuous or pulsed growth mode. Usually, with the pulsed growth mode, by switching group-III and V sources on and off alternatively, the NR geometry can be more uniform over an array. InGaN/GaN QWs can be deposited on the c-plane top face, m-plane sidewalls, and {11¯01}-plane slant facets on a c-axis-oriented NR with the highest (lowest) growth rate in the c-plane ({11¯01}-plane). After the overgrowth of p-GaN on an NR with n-GaN core and QW deposition, an NR LED array can be implemented by covering the NRs with a transparent conductor. It has been demonstrated that the optical and electrical performances of an NR LED array can be comparable to those of a planar LED. Further developments in NR LED growth and process techniques can lead to an outperforming LED device with the NR structure.
Type
journal article