Size-dependent electroluminescence and current-voltage measurements of blue ingan/gan µleds down to the submicron scale

authored by: Stefan Wolter, Hendrik Spende, Jan Gülink, Jana Hartmann, Hergo Heinrich Wehmann, Andreas Waag, Andreas Lex, Adrian Avramescu, Hans Jürgen Lugauer, Norwin von Malm, Jean Jacques Drolet, Martin Strassburg
Abstract: Besides high-power light-emitting diodes (LEDs) with dimensions in the range of mm, micro-LEDs (µLEDs) are increasingly gaining interest today, motivated by the future applications of µLEDs in augmented reality displays or for nanometrology and sensor technology. A key aspect of this miniaturization is the influence of the structure size on the electrical and optical properties of µLEDs. Thus, in this article, investigations of the size dependence of the electro-optical properties of µLEDs, with diameters in the range of 20 to 0.65 µm, by current–voltage and electroluminescence measurements are described. The measurements indicated that with decreasing size leakage currents in the forward direction decrease. To take advantage of these benefits, the surface has to be treated properly, as otherwise sidewall damages induced by dry etching will impair the optical properties. A possible countermeasure is surface treatment with a potassium hydroxide based solution that can reduce such defects.
External Organisation(s): Technische Universität Braunschweig
OSRAM Licht AG
Type: Article
Journal: Nanomaterials
Volume: 11
ISSN: 2079-4991
Publication date: 2021
Publication status: Published
Peer reviewed: Yes
ASJC Scopus subject areas: Chemical Engineering(all), Materials Science(all)
Electronic version(s): https://doi.org/10.3390/nano11040836 (Access: Open)

BibTeX

@article{ae9a8fdd853d442a9b25fe5a5f17ed0d,
title = "Size-dependent electroluminescence and current-voltage measurements of blue ingan/gan µleds down to the submicron scale",
abstract = "Besides high-power light-emitting diodes (LEDs) with dimensions in the range of mm, micro-LEDs (µLEDs) are increasingly gaining interest today, motivated by the future applications of µLEDs in augmented reality displays or for nanometrology and sensor technology. A key aspect of this miniaturization is the influence of the structure size on the electrical and optical properties of µLEDs. Thus, in this article, investigations of the size dependence of the electro-optical properties of µLEDs, with diameters in the range of 20 to 0.65 µm, by current–voltage and electroluminescence measurements are described. The measurements indicated that with decreasing size leakage currents in the forward direction decrease. To take advantage of these benefits, the surface has to be treated properly, as otherwise sidewall damages induced by dry etching will impair the optical properties. A possible countermeasure is surface treatment with a potassium hydroxide based solution that can reduce such defects.",
keywords = "Efficiency, Electroluminescence, GaN, Size effect, µLED",
author = "Stefan Wolter and Hendrik Spende and Jan G{\"u}link and Jana Hartmann and Wehmann, {Hergo Heinrich} and Andreas Waag and Andreas Lex and Adrian Avramescu and Lugauer, {Hans J{\"u}rgen} and {von Malm}, Norwin and Drolet, {Jean Jacques} and Martin Strassburg",
note = "Publisher Copyright: {\textcopyright} 2021 by the authors. Licensee MDPI, Basel, Switzerland.",
year = "2021",
doi = "10.3390/nano11040836",
language = "English",
volume = "11",
journal = "Nanomaterials",
issn = "2079-4991",
publisher = "Multidisciplinary Digital Publishing Institute",
number = "4",
}