DataVXACS Applied Materials & InterfacesPaper
journal article·2016-11-23

Nanoscale Characterization of Carrier Dynamic and Surface Passivation in InGaN/GaN Multiple Quantum Wells on GaN Nanorods

Weijian Chen, Xiaoming Wen, Michael Latzel, Martin Heilmann, Jianfeng Yang, Xi Dai, Shujuan Huang, Santosh Shrestha, Robert Patterson, Silke Christiansen, Gavin Conibeer

ACS Applied Materials & Interfaces· Volume 8· Issue 46
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Source abstract

Abstract

Using advanced two-photon excitation confocal microscopy, associated with time-resolved spectroscopy, we characterize InGaN/GaN multiple quantum wells on nanorod heterostructures and demonstrate the passivation effect of a KOH treatment. High-quality InGaN/GaN nanorods were fabricated using nanosphere lithography as a candidate material for light-emitting diode devices. The depth- and time-resolved characterization at the nanoscale provides detailed carrier dynamic analysis helpful for understanding the optical properties. The nanoscale spatially resolved images of InGaN quantum well and defects were acquired simultaneously. We demonstrate that nanorod etching improves light extraction efficiency, and a proper KOH treatment has been found to reduce the surface defects efficiently and enhance the luminescence. The optical characterization techniques provide depth-resolved and time-resolved carrier dynamics with nanoscale spatially resolved mapping, which is crucial for a comprehensive and thorough understanding of nanostructured materials and provides novel insight into the improvement of materials fabrication and applications.
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Research context

Nanomaterials

OpenAlex topics: GaN-based semiconductor devices and materials · Nanowire Synthesis and Applications · Semiconductor materials and devices

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Australian Centre for Advanced Photovoltaics, School of Photovoltaic and Renewable Energy Engineering, UNSW Australia, Sydney 2052, Australia

Centre for Micro-Photonics, Swinburne University of Technology, Melbourne 3122, Australia

Max Planck Institute for the Science of Light, Günther-Scharowsky-Str. 1/Bau 24, 91058 Erlangen, Germany

Institute of Optics, Information and Photonics, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Staudtstr. 7/B2, 91058 Erlangen, Germany

Institute of Nanoarchitectures for Energy Conversion, Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, Hahn-Meitner-Platz 1, 14109 Berlin, Germany

Department of Physics, Freie Universität Berlin, Arnimallee 14, 14195 Berlin, Germany

Funding

Deutscher Akademischer Austauschdienst · Deutsche Forschungsgemeinschaft · China Scholarship Council · Australian Renewable Energy Agency · Seventh Framework Programme

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