Simultaneous optical and structural investigation of nanomaterials and nanostructures for LEDs (Presentation Recording)

Marcus Mueller; Frank Bertram; Gordson Schmidt; Jürgen Christen

doi:10.1117/12.2189907

5 October 2015 Simultaneous optical and structural investigation of nanomaterials and nanostructures for LEDs (Presentation Recording)

Marcus Mueller, Frank Bertram, Gordson Schmidt, Jürgen Christen

Author Affiliations +

Proceedings Volume 9553, Low-Dimensional Materials and Devices; 95530D (2015) https://doi.org/10.1117/12.2189907
Event: SPIE Nanoscience + Engineering, 2015, San Diego, California, United States

Abstract

In the past few years, tremendous progress has been achieved on epitaxial growth and processing of group III nitride nano- and microrods. Furthermore, these growth improvements have allowed the fabrication of optoelectronic devices based nanorods as active elements, i.e. light emitting diodes (LEDs). However, their efficiency is still far behind the performance of conventional GaN-based light emitting diodes. The controlled growth of GaN nanorods offers a potential benefit for achieving higher efficiencies of III-Nitride based optoelectronic devices due to a high surface to volume ratio. Nanorods have a very large active area compared to their footprint. Since the active region is wrapped around the three-dimensional core (for core shell structures), the active layer scales with the rod’s aspect ratio (i.e. the ratio of height and diameter). Therefore, by controlling their density, diameter and height, a tremendous increase of active surface can be achieved. Additionally, the low defect density in nanorods allows the characterization of single extended defects which is of high interest for a clear understanding of the formation of these defects. In this study we present a direct nano-scale correlation of the optical properties with the actual real crystalline structure of single GaN nanorods using low temperature CL spectroscopy in a scanning transmission electron microscope (STEM). We concentrate on the crystalline quality, local In incorporation, n- and p-layer quality and defects of the complete structures.

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Marcus Mueller, Frank Bertram, Gordson Schmidt, and Jürgen Christen "Simultaneous optical and structural investigation of nanomaterials and nanostructures for LEDs (Presentation Recording)", Proc. SPIE 9553, Low-Dimensional Materials and Devices, 95530D (5 October 2015); https://doi.org/10.1117/12.2189907

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KEYWORDS

Light emitting diodes

Nanorods

Crystals

Gallium nitride

Nanomaterials

Nanostructures

Optoelectronic devices

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