{"id":168892,"date":"2024-07-11T09:30:00","date_gmt":"2024-07-11T13:30:00","guid":{"rendered":"https:\/\/inrs.ca\/?p=168892"},"modified":"2024-07-10T14:26:23","modified_gmt":"2024-07-10T18:26:23","slug":"an-innovatively-structured-2d-material-with-high-promises-to-revolutionize-optoelectronics","status":"publish","type":"post","link":"https:\/\/inrs.ca\/en\/news\/an-innovatively-structured-2d-material-with-high-promises-to-revolutionize-optoelectronics\/","title":{"rendered":"An Innovatively Structured 2D-Material with High promises to Revolutionize Optoelectronics"},"content":{"rendered":"\n<p class=\"has-large-font-size wp-block-paragraph\"><strong>Professor My Ali El Khakani achieves a breakthrough in materials science by controlling the optoelectronic properties of MoS<\/strong>\u2082<strong> films.<\/strong><\/p>\n\n\n    \n<div class=\"wp-block full-width-image \">\n    <div class=\"image-ctn\">\n        <img decoding=\"async\" src=\"https:\/\/inrs.ca\/wp-content\/uploads\/Photo-Groupe-El_Khakani-june2024-1.jpg\" alt=\"\" \/>\n    <\/div>\n    <p>Professor El Khakani&#8217;s team in his INRS laboratory.<\/p>\n<\/div>\n\n\n<p class=\"wp-block-paragraph\">An international research team led by Professor <a href=\"blank\">My Ali El Khakani<\/a> of the Institut national de la recherche scientifique (INRS) has made a surprising discovery about the properties of molybdenum disulphide, also known as MoS\u2082. The material is highly sought after in optoelectronics, a field at the crossings of optics and electronics.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The results of this study, carried out in collaboration with Professor Mustapha Jouiad\u2019s team at the<a href=\"blank\"> Universit\u00e9 de Picardie Jules Verne (UPJV)<\/a>, have just been published in the prestigious journal <a href=\"blank\"><em>Advanced Optical Materials<\/em><\/a>, and are featured on the inside cover of May issue.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This work has been accomplished within the framework of Driss Mouloua\u2019s thesis research, carried out under the joint supervision of Professors El Khakani and Jouiad at INRS\u2019s <a href=\"blank\">\u00c9nergie Mat\u00e9riaux T\u00e9l\u00e9communications Research Centre<\/a> and UPJV. Dr.\u00a0Mouloua is currently a postdoctoral researcher at the Commissariat \u00e0 l\u2019\u00e9nergie atomique in France.<\/p>\n\n\n\n<div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<figure class=\"wp-block-image alignright size-full is-resized is-style-rounded\"><img loading=\"lazy\" decoding=\"async\" width=\"928\" height=\"1071\" src=\"https:\/\/inrs.ca\/wp-content\/uploads\/photo-Driss-Moulouaa-2.jpg\" alt=\"\" class=\"wp-image-168889\" style=\"aspect-ratio:1;object-fit:cover;width:234px;height:auto\" srcset=\"https:\/\/inrs.ca\/wp-content\/uploads\/photo-Driss-Moulouaa-2.jpg 928w, https:\/\/inrs.ca\/wp-content\/uploads\/photo-Driss-Moulouaa-2-260x300.jpg 260w, https:\/\/inrs.ca\/wp-content\/uploads\/photo-Driss-Moulouaa-2-887x1024.jpg 887w, https:\/\/inrs.ca\/wp-content\/uploads\/photo-Driss-Moulouaa-2-768x886.jpg 768w\" sizes=\"auto, (max-width: 928px) 100vw, 928px\" \/><\/figure>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\">\u201cBy proposing a new way of growing MoS\u2082 films with a vertically layered structure, we are paving the way for the synthesis of MoS\u2082 that is labelled as \u20183D\u2019, but has exceptional \u20182D\u2019 behavior. The results of this thesis work could lead to innovative developments in the fields of optoelectronics and renewable energies.\u201d<\/p>\n<cite>Driss Mouloua, PhD, energy and material sciences<\/cite><\/blockquote>\n\n\n\n<div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>A material with unique properties<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Following the worldwide excitement generated by graphene and its applications, MoS\u2082 is emerging as another two-dimensional (2D) material, yet semiconductor, that is attracting a great deal of interest from the scientific community because of its exceptional properties. While it has been used since the 1970s and 1980s as a solid lubricant in the aerospace industry and for high-performance mechanics, MoS\u2082 is making a comeback as a strategic material for optoelectronics.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">MoS\u2082 is a material that can strongly absorb light and transform it into electrical charges with high electron mobility, giving it the capacity for rapid signal transmission. This combination of unique properties makes it particularly appealing for the development of optoelectronic applications such as photodetectors, photonic switches, next-generation solar cells, and light-emitting diodes (LEDs).<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">However, all these properties depend on the way the monolayers (or atomic \u201cmonosheets\u201d) of this 2D material, which can be pictured as \u201cpuff pastry\u201d structure, are arranged in the films. Over time, scientists have developed manufacturing strategies to obtain 2 to 5 horizontally layered monolayers, in order to take advantage of MoS\u2082\u2019s exceptional optoelectronic properties.<\/p>\n\n\n\n<div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>A new paradigm<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">With their most recent study, Professor El Khakani\u2019s team has changed the paradigm by demonstrating that it is possible to synthesize relatively thick MoS\u2082 films (\u201c3D\u201d) that are made up of vertically aligned MoS\u2082 layers. To achieve this, the team used an innovative approach based on pulsed-laser deposition (PLD) technique.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">By controlling the growth conditions of these thin PLD-MoS\u2082 films and studying their properties, the researchers have achieved relatively thick MoS<sub>2<\/sub> films (about 100\u00a0nanometres thick, equivalent to ~200 atomic monolayers of MoS<sub>2<\/sub>) but their optoelectronic behavior astonishingly resembles that of ultra-thin 2D MoS<sub>2<\/sub> (with only 3-5 MoS<sub>2<\/sub> monolayers).<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u201cIn the end, we have a \u20183D\u2019 material that behaves like a 2D material, which is quite interesting yet intriguing,\u201d said Professor El Khakani.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">By pushing deeper their nanostructural charcaterizations, by using high-resolution electron transmission microscopy, the researchers have discovered that the more vertical the layers, the better the photodetection performance of the PLD-MoS<sub>2<\/sub> films. This novel nanostructure enables the vertical MoS\u2082monolayers to interact individually with light, enhancing thereby their capacity to absorb light and to achieve a swift vertical transfer (along the MoS<sub>2<\/sub> layers) of the created photocharges. This, in turn, translates into an optoelectronic performance comparable to that of the few-layers \u201c2D\u201d MoS<sub>2<\/sub> ultrathin films. Moreover, these \u201c3D\u201d PLD-MoS<sub>2<\/sub> films can be scaled-up to the wafer level while circumventing the difficulties associated with the challenging synthesis of only few horizontal monolayers.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">With this achievement, Professor El Kakhani\u2019s team is opening a new route towards a better control of the optoelectronic properties of MoS<sub>2<\/sub> films by gaining control on the vertical alignment of their constituting MoS<sub>2<\/sub> monolayers.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u201cNot only is this the first time that MoS\u2082 with vertically aligned layers has been achieved by using the PLD technique, but, even more importantly, we have succeeded in correlating directly the degree of vertical alignment of the monolayers with the photodetection performance of the MoS\u2082 films. This is an important breakthrough that will contribute to a better understanding of quantum confinement phenomena in \u201c3D\u201d-MoS\u2082, and to improving the design of new optoelectronic devices based on \u201c2D\u201d materials, such as MoS\u2082, or WS\u2082\u201d concludes the researcher.<\/p>\n\n\n\n<div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>About this article <\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Driss Mouloua, Jo\u00ebl LeBlanc-Lavoie, Loick Pichon, Nitul S.\u00a0Rajput, Mimoun El Marssi, Mustapha Jouiad, and My Ali El Khakani, \u201cTuning the Optoelectronic Properties of Pulsed Laser Deposited \u20183D\u2019-MoS\u2082 Films via the Degree of Vertical Alignment of Their Constituting Layers\u201d, <em>Adv.<\/em> <em>Optical Mater.<\/em> 2024, 2302966; DOI: 10.1002\/adom.202302966<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This research was funded by the <a href=\"blank\">Natural Sciences and Engineering Research Council of Canada<\/a> and the <a href=\"blank\">Hauts-de-France region<\/a>.<\/p>\n\n\n\n<div style=\"height:40px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n","protected":false},"excerpt":{"rendered":"<p>A research team led by Professor My Ali El Khakani has made a surprising discovery concerning the properties of molybdenum disulfide MoS2.<\/p>\n","protected":false},"author":430,"featured_media":168901,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"categories":[688,15],"tags":[],"sectors":[731],"class_list":["post-168892","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-innover-a-linrs-en","category-series-en","sectors-materiaux-en"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v26.1 (Yoast SEO v28.3) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>An Innovatively Structured 2D-Material with High promises to Revolutionize Optoelectronics | INRS News<\/title>\n<meta name=\"description\" content=\"A research team led by Professor My Ali El Khakani has made a 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