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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...

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Autores principales: Fernández, Susana, Molinero, Antonio, Sanz, David, González, José Pablo, de la Cruz, Marina, Gandía, José Javier, Cárabe, Julio
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7601039/
https://www.ncbi.nlm.nih.gov/pubmed/33019675
http://dx.doi.org/10.3390/mi11100919
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author Fernández, Susana
Molinero, Antonio
Sanz, David
González, José Pablo
de la Cruz, Marina
Gandía, José Javier
Cárabe, Julio
author_facet Fernández, Susana
Molinero, Antonio
Sanz, David
González, José Pablo
de la Cruz, Marina
Gandía, José Javier
Cárabe, Julio
author_sort Fernández, Susana
collection PubMed
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.
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spelling pubmed-76010392020-11-01 Graphene-Based Contacts for Optoelectronic Devices Fernández, Susana Molinero, Antonio Sanz, David González, José Pablo de la Cruz, Marina Gandía, José Javier Cárabe, Julio Micromachines (Basel) Article 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. MDPI 2020-10-01 /pmc/articles/PMC7601039/ /pubmed/33019675 http://dx.doi.org/10.3390/mi11100919 Text en © 2020 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Fernández, Susana
Molinero, Antonio
Sanz, David
González, José Pablo
de la Cruz, Marina
Gandía, José Javier
Cárabe, Julio
Graphene-Based Contacts for 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 Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7601039/
https://www.ncbi.nlm.nih.gov/pubmed/33019675
http://dx.doi.org/10.3390/mi11100919
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