Graphene-Based Contacts for Optoelectronic Devices
Hybrid transparent contacts based on combinations of a transparent conductive oxide and a few graphene monolayers were developed in order to evaluate their optical and electrical performance with the main aim to use them as front contacts in optoelectronic devices. The assessment of the most suitabl...
| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
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MDPI AG
2020-10-01
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| Series: | Micromachines |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2072-666X/11/10/919 |
| _version_ | 1797552024963776512 |
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| author | Susana Fernández Antonio Molinero David Sanz José Pablo González Marina de la Cruz José Javier Gandía Julio Cárabe |
| author_facet | Susana Fernández Antonio Molinero David Sanz José Pablo González Marina de la Cruz José Javier Gandía Julio Cárabe |
| author_sort | Susana Fernández |
| collection | DOAJ |
| description | Hybrid transparent contacts based on combinations of a transparent conductive oxide and a few graphene monolayers were developed in order to evaluate their optical and electrical performance with the main aim to use them as front contacts in optoelectronic devices. The assessment of the most suitable strategies for their fabrication was performed by testing different protocols addressing such issues as the protection of the device structure underneath, the limitation of sample temperature during the graphene-monolayer transfer process and the determination of the most suitable stacking structure. Suitable metal ohmic electrodes were also evaluated. Among a number of options tested, the metal contact based on Ti + Ag showed the highest reproducibility and the lowest contact resistivity. Finally, with the objective of extracting the current generated from optoelectronic devices to the output pins of an external package, focusing on a near future commercial application, the electrical properties of the connections made with an ultrasonic bonding machine (sonic welding) between the optimized Ti + Ag metal contacts and Al or Au micro-wires were also evaluated. All these results have an enormous potential as hybrid electrodes based on graphene to be used in novel designs of a future generation of optoelectronic devices, such as solar cells. |
| first_indexed | 2024-03-10T15:54:15Z |
| format | Article |
| id | doaj.art-be31498099b84ddeb789f8be1b4c45ce |
| institution | Directory Open Access Journal |
| issn | 2072-666X |
| language | English |
| last_indexed | 2024-03-10T15:54:15Z |
| publishDate | 2020-10-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Micromachines |
| spelling | doaj.art-be31498099b84ddeb789f8be1b4c45ce2023-11-20T15:49:14ZengMDPI AGMicromachines2072-666X2020-10-01111091910.3390/mi11100919Graphene-Based Contacts for Optoelectronic DevicesSusana Fernández0Antonio Molinero1David Sanz2José Pablo González3Marina de la Cruz4José Javier Gandía5Julio Cárabe6CIEMAT, Departamento de Energía, Unidad de Energía Solar Fotovoltaica, Avda. Complutense 40, 28040 Madrid, SpainCIEMAT, Departamento de Electrónica, Avda. Complutense 40, 28040 Madrid, SpainCIEMAT, Departamento de Electrónica, Avda. Complutense 40, 28040 Madrid, SpainCIEMAT, Departamento de Energía, Unidad de Energía Solar Fotovoltaica, Avda. Complutense 40, 28040 Madrid, SpainCIEMAT, Departamento de Energía, Unidad de Energía Solar Fotovoltaica, Avda. Complutense 40, 28040 Madrid, SpainCIEMAT, Departamento de Energía, Unidad de Energía Solar Fotovoltaica, Avda. Complutense 40, 28040 Madrid, SpainCIEMAT, Departamento de Energía, Unidad de Energía Solar Fotovoltaica, Avda. Complutense 40, 28040 Madrid, SpainHybrid transparent contacts based on combinations of a transparent conductive oxide and a few graphene monolayers were developed in order to evaluate their optical and electrical performance with the main aim to use them as front contacts in optoelectronic devices. The assessment of the most suitable strategies for their fabrication was performed by testing different protocols addressing such issues as the protection of the device structure underneath, the limitation of sample temperature during the graphene-monolayer transfer process and the determination of the most suitable stacking structure. Suitable metal ohmic electrodes were also evaluated. Among a number of options tested, the metal contact based on Ti + Ag showed the highest reproducibility and the lowest contact resistivity. Finally, with the objective of extracting the current generated from optoelectronic devices to the output pins of an external package, focusing on a near future commercial application, the electrical properties of the connections made with an ultrasonic bonding machine (sonic welding) between the optimized Ti + Ag metal contacts and Al or Au micro-wires were also evaluated. All these results have an enormous potential as hybrid electrodes based on graphene to be used in novel designs of a future generation of optoelectronic devices, such as solar cells.https://www.mdpi.com/2072-666X/11/10/919grapheneohmic contactoptoelectronic devices |
| spellingShingle | Susana Fernández Antonio Molinero David Sanz José Pablo González Marina de la Cruz José Javier Gandía Julio Cárabe Graphene-Based Contacts for Optoelectronic Devices Micromachines graphene ohmic contact optoelectronic devices |
| title | Graphene-Based Contacts for Optoelectronic Devices |
| title_full | Graphene-Based Contacts for Optoelectronic Devices |
| title_fullStr | Graphene-Based Contacts for Optoelectronic Devices |
| title_full_unstemmed | Graphene-Based Contacts for Optoelectronic Devices |
| title_short | Graphene-Based Contacts for Optoelectronic Devices |
| title_sort | graphene based contacts for optoelectronic devices |
| topic | graphene ohmic contact optoelectronic devices |
| url | https://www.mdpi.com/2072-666X/11/10/919 |
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