Skip to main content

Lund University Publications

LUND UNIVERSITY LIBRARIES

Cathodoluminescence investigations of dark-line defects in platelet-based InGaN nano-LED structures

Gustafsson, Anders LU orcid ; Persson, Axel R. ; Persson, Per O.Å. ; Darakchieva, Vanya LU ; Bi, Zhaoxia LU orcid and Samuelson, Lars LU (2024) In Nanotechnology 35(25).
Abstract

We have investigated the optical properties of heterostructured InGaN platelets aiming at red emission, intended for use as nano-scaled light-emitting diodes. The focus is on the presence of non-radiative emission in the form of dark line defects. We have performed the study using hyperspectral cathodoluminescence imaging. The platelets were grown on a template consisting of InGaN pyramids, flattened by chemical mechanical polishing. These templates are defect free, whereas the dark line defects are introduced in the lower barrier and tend to propagate through all the subsequent layers, as revealed by the imaging of different layers in the structure. We conclude that the dark line defects are caused by stacking mismatch boundaries... (More)

We have investigated the optical properties of heterostructured InGaN platelets aiming at red emission, intended for use as nano-scaled light-emitting diodes. The focus is on the presence of non-radiative emission in the form of dark line defects. We have performed the study using hyperspectral cathodoluminescence imaging. The platelets were grown on a template consisting of InGaN pyramids, flattened by chemical mechanical polishing. These templates are defect free, whereas the dark line defects are introduced in the lower barrier and tend to propagate through all the subsequent layers, as revealed by the imaging of different layers in the structure. We conclude that the dark line defects are caused by stacking mismatch boundaries introduced by multiple seeding and step bunching at the edges of the as-polished, dome shaped templates. To avoid these defects, we suggest that the starting material must be flat rather than dome shaped.

(Less)
Please use this url to cite or link to this publication:
author
; ; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
cathodoluminescence, III-nitrides, platelets, stacking mismatch boundaries, μ-LED
in
Nanotechnology
volume
35
issue
25
article number
255703
publisher
IOP Publishing
external identifiers
  • pmid:38484394
  • scopus:85189854230
ISSN
0957-4484
DOI
10.1088/1361-6528/ad33e9
language
English
LU publication?
yes
id
777b7ae7-9b3a-458c-ac59-e6aa37e37379
date added to LUP
2024-04-23 10:22:10
date last changed
2024-06-18 15:17:47
@article{777b7ae7-9b3a-458c-ac59-e6aa37e37379,
  abstract     = {{<p>We have investigated the optical properties of heterostructured InGaN platelets aiming at red emission, intended for use as nano-scaled light-emitting diodes. The focus is on the presence of non-radiative emission in the form of dark line defects. We have performed the study using hyperspectral cathodoluminescence imaging. The platelets were grown on a template consisting of InGaN pyramids, flattened by chemical mechanical polishing. These templates are defect free, whereas the dark line defects are introduced in the lower barrier and tend to propagate through all the subsequent layers, as revealed by the imaging of different layers in the structure. We conclude that the dark line defects are caused by stacking mismatch boundaries introduced by multiple seeding and step bunching at the edges of the as-polished, dome shaped templates. To avoid these defects, we suggest that the starting material must be flat rather than dome shaped.</p>}},
  author       = {{Gustafsson, Anders and Persson, Axel R. and Persson, Per O.Å. and Darakchieva, Vanya and Bi, Zhaoxia and Samuelson, Lars}},
  issn         = {{0957-4484}},
  keywords     = {{cathodoluminescence; III-nitrides; platelets; stacking mismatch boundaries; μ-LED}},
  language     = {{eng}},
  month        = {{06}},
  number       = {{25}},
  publisher    = {{IOP Publishing}},
  series       = {{Nanotechnology}},
  title        = {{Cathodoluminescence investigations of dark-line defects in platelet-based InGaN nano-LED structures}},
  url          = {{http://dx.doi.org/10.1088/1361-6528/ad33e9}},
  doi          = {{10.1088/1361-6528/ad33e9}},
  volume       = {{35}},
  year         = {{2024}},
}