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Gustafsson A, Persson AR, Persson POÅ, Darakchieva V, Bi Z, Samuelson L. Cathodoluminescence investigations of dark-line defects in platelet-based InGaN nano-LED structures. NANOTECHNOLOGY 2024; 35:255703. [PMID: 38484394 DOI: 10.1088/1361-6528/ad33e9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/23/2024] [Accepted: 03/14/2024] [Indexed: 04/04/2024]
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 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.
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Affiliation(s)
- Anders Gustafsson
- Solid State Physics and NanoLund, Lund University, Box 118, Lund SE-221 00, Sweden
| | - Axel R Persson
- Thin Film Physics Division, Department of Physics, Chemistry and Biology (IFM), Linköping University, Linköping SE-581 83, Sweden
- Competence Center for III-Nitride Technology C3NiT-Janzén, Department of Physics, Chemistry and Biology (IFM), Linköping University, Linköping SE-581 83, Sweden
| | - Per O Å Persson
- Thin Film Physics Division, Department of Physics, Chemistry and Biology (IFM), Linköping University, Linköping SE-581 83, Sweden
| | - Vanya Darakchieva
- Solid State Physics and NanoLund, Lund University, Box 118, Lund SE-221 00, Sweden
- Competence Center for III-Nitride Technology C3NiT-Janzén, Department of Physics, Chemistry and Biology (IFM), Linköping University, Linköping SE-581 83, Sweden
| | - Zhaoxia Bi
- Solid State Physics and NanoLund, Lund University, Box 118, Lund SE-221 00, Sweden
- Future Display Institute of Xiamen, Xiamen 361005, People's Republic of China
| | - Lars Samuelson
- Solid State Physics and NanoLund, Lund University, Box 118, Lund SE-221 00, Sweden
- Institute of Nanoscience and Applications, Southern University of Science and Technology, Shenzhen, People's Republic of China
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