Graphene-based transparent conductive electrodes for GaN-based light emitting diodes: Challenges and countermeasures
Graphene, with attractive electrical, optical, mechanical and thermal properties, is considered to be an ideal candidate for transparent conductive electrodes (TCEs) in many optoelectronic devices, including III-nitride based devices. However, high contact resistivity (ρc) between graphene and GaN (...
| Main Authors: | , , , , , , , , , |
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| Format: | Journal Article |
| Language: | English |
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2016
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| Online Access: | https://hdl.handle.net/10356/81728 http://hdl.handle.net/10220/39658 |
| _version_ | 1824454961021321216 |
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| author | Wang, Liancheng Liu, Wei Zhang, Yiyun Zhang, Zi-Hui Yi, Xiaoyan Wang, Guohong Sun, Xiaowei Zhu, Hongwei Tan, Swee Tiam Hilmi Volkan Demir |
| author2 | School of Electrical and Electronic Engineering |
| author_facet | School of Electrical and Electronic Engineering Wang, Liancheng Liu, Wei Zhang, Yiyun Zhang, Zi-Hui Yi, Xiaoyan Wang, Guohong Sun, Xiaowei Zhu, Hongwei Tan, Swee Tiam Hilmi Volkan Demir |
| author_sort | Wang, Liancheng |
| collection | NTU |
| description | Graphene, with attractive electrical, optical, mechanical and thermal properties, is considered to be an ideal candidate for transparent conductive electrodes (TCEs) in many optoelectronic devices, including III-nitride based devices. However, high contact resistivity (ρc) between graphene and GaN (especially p-GaN) has become a major challenge for graphene TCEs utilization in GaN-based light-emitting diodes (LEDs). Here, we analyzed the graphene/GaN contact junction in detail and reviewed the current research progress for reducing ρc in graphene TCEs on GaN LEDs, including interface engineering, chemical doping and tunnel junction design. We also analyzed the current diffusion length for a single layer graphene (SLG) and multiple layer graphene (MLG) TCEs. Finally, to improve the fabrication process compatibility and simplicity with paramount reproduction, a method of directly growing graphene films on GaN by chemical vapor deposition (CVD) is proposed. We also give a short analysis on the reliability of graphene TCEs for GaN-based LEDs. It is believed that this is the ultimate solution for graphene TCEs application for GaN-based LEDs and others in general for other opto- and electrical devices. |
| first_indexed | 2025-02-19T03:30:37Z |
| format | Journal Article |
| id | ntu-10356/81728 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2025-02-19T03:30:37Z |
| publishDate | 2016 |
| record_format | dspace |
| spelling | ntu-10356/817282020-03-07T13:57:26Z Graphene-based transparent conductive electrodes for GaN-based light emitting diodes: Challenges and countermeasures Wang, Liancheng Liu, Wei Zhang, Yiyun Zhang, Zi-Hui Yi, Xiaoyan Wang, Guohong Sun, Xiaowei Zhu, Hongwei Tan, Swee Tiam Hilmi Volkan Demir School of Electrical and Electronic Engineering Graphene; Light emitting diodes; Transparent conductive electrodes; Gallium nitride; Chemical vapor deposition Graphene, with attractive electrical, optical, mechanical and thermal properties, is considered to be an ideal candidate for transparent conductive electrodes (TCEs) in many optoelectronic devices, including III-nitride based devices. However, high contact resistivity (ρc) between graphene and GaN (especially p-GaN) has become a major challenge for graphene TCEs utilization in GaN-based light-emitting diodes (LEDs). Here, we analyzed the graphene/GaN contact junction in detail and reviewed the current research progress for reducing ρc in graphene TCEs on GaN LEDs, including interface engineering, chemical doping and tunnel junction design. We also analyzed the current diffusion length for a single layer graphene (SLG) and multiple layer graphene (MLG) TCEs. Finally, to improve the fabrication process compatibility and simplicity with paramount reproduction, a method of directly growing graphene films on GaN by chemical vapor deposition (CVD) is proposed. We also give a short analysis on the reliability of graphene TCEs for GaN-based LEDs. It is believed that this is the ultimate solution for graphene TCEs application for GaN-based LEDs and others in general for other opto- and electrical devices. ASTAR (Agency for Sci., Tech. and Research, S’pore) Accepted version 2016-01-11T08:46:47Z 2019-12-06T14:39:17Z 2016-01-11T08:46:47Z 2019-12-06T14:39:17Z 2015 Journal Article Wang, L., Liu, W., Zhang, Y., Zhang, Z.-H., Tan, S. T., Yi, X., et al. (2015). Graphene-based transparent conductive electrodes for GaN-based light emitting diodes: Challenges and countermeasures. Nano Energy, 12, 419-436. 2211-2855 https://hdl.handle.net/10356/81728 http://hdl.handle.net/10220/39658 10.1016/j.nanoen.2014.12.035 en Nano Energy © 2014 Elsevier Ltd. This is the author created version of a work that has been peer reviewed and accepted for publication by Nano Energy, Elsevier Ltd. It incorporates referee’s comments but changes resulting from the publishing process, such as copyediting, structural formatting, may not be reflected in this document. The published version is available at: [http://dx.doi.org/10.1016/j.nanoen.2014.12.035]. 44 p. application/pdf |
| spellingShingle | Graphene; Light emitting diodes; Transparent conductive electrodes; Gallium nitride; Chemical vapor deposition Wang, Liancheng Liu, Wei Zhang, Yiyun Zhang, Zi-Hui Yi, Xiaoyan Wang, Guohong Sun, Xiaowei Zhu, Hongwei Tan, Swee Tiam Hilmi Volkan Demir Graphene-based transparent conductive electrodes for GaN-based light emitting diodes: Challenges and countermeasures |
| title | Graphene-based transparent conductive electrodes for GaN-based light emitting diodes: Challenges and countermeasures |
| title_full | Graphene-based transparent conductive electrodes for GaN-based light emitting diodes: Challenges and countermeasures |
| title_fullStr | Graphene-based transparent conductive electrodes for GaN-based light emitting diodes: Challenges and countermeasures |
| title_full_unstemmed | Graphene-based transparent conductive electrodes for GaN-based light emitting diodes: Challenges and countermeasures |
| title_short | Graphene-based transparent conductive electrodes for GaN-based light emitting diodes: Challenges and countermeasures |
| title_sort | graphene based transparent conductive electrodes for gan based light emitting diodes challenges and countermeasures |
| topic | Graphene; Light emitting diodes; Transparent conductive electrodes; Gallium nitride; Chemical vapor deposition |
| url | https://hdl.handle.net/10356/81728 http://hdl.handle.net/10220/39658 |
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