Optical and electrical properties of nanostructured metallic electrical contacts
We study the optical and electrical properties of silver films with a graded thickness obtained through metallic evaporation in vacuum on a tilted substrate to evaluate their use as semitransparent electrical contacts. We measure their ellipsometric coefficients, optical transmissions and electrical...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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IOP Publishing
2017-01-01
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| Series: | Materials Research Express |
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| Online Access: | https://doi.org/10.1088/2053-1591/aa58bd |
| _version_ | 1797747214799339520 |
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| author | Victor J Toranzos Guillermo P Ortiz W Luis Mochán Jorge O Zerbino |
| author_facet | Victor J Toranzos Guillermo P Ortiz W Luis Mochán Jorge O Zerbino |
| author_sort | Victor J Toranzos |
| collection | DOAJ |
| description | We study the optical and electrical properties of silver films with a graded thickness obtained through metallic evaporation in vacuum on a tilted substrate to evaluate their use as semitransparent electrical contacts. We measure their ellipsometric coefficients, optical transmissions and electrical conductivity for different widths, and we employ an efficient recursive method to calculate their macroscopic dielectric function, their optical properties and their microscopic electric fields. The topology of very thin films corresponds to disconnected islands, while very wide films are simply connected. For intermediate widths the film becomes semicontinuous, multiply connected, and its microscopic electric field develops hotspots at optical resonances which appear near the percolation threshold of the conducting phase, yielding large ohmic losses that increase the absorptance above that of a corresponding homogeneous film. Optimizing the thickness of the film to maximize its transmittance above the percolation threshold of the conductive phase we obtained a film with transmittance T = 0.41 and a sheet resistance $R_{s}^{\text{max}}\approx 2.7 \Omega $ . We also analyze the observed emission frequency shift of porous silicon electroluminescent devices when Ag films are used as solid electrical contacts in replacement of electrolytic ones. |
| first_indexed | 2024-03-12T15:47:37Z |
| format | Article |
| id | doaj.art-1355eeefa7b942a9bef3434acf3b0389 |
| institution | Directory Open Access Journal |
| issn | 2053-1591 |
| language | English |
| last_indexed | 2024-03-12T15:47:37Z |
| publishDate | 2017-01-01 |
| publisher | IOP Publishing |
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| series | Materials Research Express |
| spelling | doaj.art-1355eeefa7b942a9bef3434acf3b03892023-08-09T15:20:53ZengIOP PublishingMaterials Research Express2053-15912017-01-014101502610.1088/2053-1591/aa58bdOptical and electrical properties of nanostructured metallic electrical contactsVictor J Toranzos0Guillermo P Ortiz1W Luis Mochán2Jorge O Zerbino3Departamento de Física—Facultad de Ciencias Exactas Naturales y Agrimensura, Universidad Nacional del Nordeste , Corrientes, ArgentinaDepartamento de Física—Facultad de Ciencias Exactas Naturales y Agrimensura, Universidad Nacional del Nordeste , Corrientes, ArgentinaInstituto de Ciencias Físicas, Universidad Nacional Autónoma de México , Cuernavaca, Morelos, MexicoInstituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas , Centro Investigaciones Científicas de la Provincia de Buenos Aires, La Plata, ArgentinaWe study the optical and electrical properties of silver films with a graded thickness obtained through metallic evaporation in vacuum on a tilted substrate to evaluate their use as semitransparent electrical contacts. We measure their ellipsometric coefficients, optical transmissions and electrical conductivity for different widths, and we employ an efficient recursive method to calculate their macroscopic dielectric function, their optical properties and their microscopic electric fields. The topology of very thin films corresponds to disconnected islands, while very wide films are simply connected. For intermediate widths the film becomes semicontinuous, multiply connected, and its microscopic electric field develops hotspots at optical resonances which appear near the percolation threshold of the conducting phase, yielding large ohmic losses that increase the absorptance above that of a corresponding homogeneous film. Optimizing the thickness of the film to maximize its transmittance above the percolation threshold of the conductive phase we obtained a film with transmittance T = 0.41 and a sheet resistance $R_{s}^{\text{max}}\approx 2.7 \Omega $ . We also analyze the observed emission frequency shift of porous silicon electroluminescent devices when Ag films are used as solid electrical contacts in replacement of electrolytic ones.https://doi.org/10.1088/2053-1591/aa58bdhotspotseffective mediarecursive algorithms |
| spellingShingle | Victor J Toranzos Guillermo P Ortiz W Luis Mochán Jorge O Zerbino Optical and electrical properties of nanostructured metallic electrical contacts Materials Research Express hotspots effective media recursive algorithms |
| title | Optical and electrical properties of nanostructured metallic electrical contacts |
| title_full | Optical and electrical properties of nanostructured metallic electrical contacts |
| title_fullStr | Optical and electrical properties of nanostructured metallic electrical contacts |
| title_full_unstemmed | Optical and electrical properties of nanostructured metallic electrical contacts |
| title_short | Optical and electrical properties of nanostructured metallic electrical contacts |
| title_sort | optical and electrical properties of nanostructured metallic electrical contacts |
| topic | hotspots effective media recursive algorithms |
| url | https://doi.org/10.1088/2053-1591/aa58bd |
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