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- Title
Size-Dependent Electroluminescence and Current-Voltage Measurements of Blue InGaN/GaN µLEDs down to the Submicron Scale.
- Authors
Wolter, Stefan; Spende, Hendrik; Gülink, Jan; Hartmann, Jana; Wehmann, Hergo-Heinrich; Waag, Andreas; Lex, Andreas; Avramescu, Adrian; Lugauer, Hans-Jürgen; Malm, Norwin von; Drolet, Jean-Jacques; Strassburg, Martin; Cannas, Marco; Obraztsova, Elena D.; Pisarski, Wojciech
- 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.
- Subjects
STRAY currents; ELECTROLUMINESCENCE; LIGHT emitting diodes; PLASMA etching; OPTICAL properties; SURFACE preparation; ELECTRO-optical effects
- Publication
Nanomaterials (2079-4991), 2021, Vol 11, Issue 4, p836
- ISSN
2079-4991
- Publication type
Article
- DOI
10.3390/nano11040836