{"id":69967,"date":"2024-09-03T09:46:41","date_gmt":"2024-09-03T07:46:41","guid":{"rendered":"https:\/\/www.iemn.fr\/?p=69967"},"modified":"2024-09-12T16:25:12","modified_gmt":"2024-09-12T14:25:12","slug":"des-jonctions-moleculaires-innovantes-pour-des-commutateurs-et-detecteurs-terahertz","status":"publish","type":"post","link":"https:\/\/www.iemn.fr\/en\/newsletter\/des-jonctions-moleculaires-innovantes-pour-des-commutateurs-et-detecteurs-terahertz.html","title":{"rendered":"Innovative Molecular Junctions for Terahertz Switches and Detectors"},"content":{"rendered":"<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-m0zdkx2y-d802c2fea5c396c4b5ed23481b363743\">\n#top .av_textblock_section.av-m0zdkx2y-d802c2fea5c396c4b5ed23481b363743 .avia_textblock{\nfont-size:24px;\n}\n<\/style>\n<section  class='av_textblock_section av-m0zdkx2y-d802c2fea5c396c4b5ed23481b363743'   itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/BlogPosting\" itemprop=\"blogPost\" ><div class='avia_textblock'  itemprop=\"text\" ><p style=\"text-align: center;\"><span style=\"color: #8f3f01;\">Innovative Molecular Junctions for Terahertz Switches and Detectors<\/span><\/p>\n<\/div><\/section>\n<div  class='flex_column av-1cj60of-a41243a461e1429567b4f5837e5c749e av_one_half  avia-builder-el-1  el_after_av_textblock  el_before_av_one_half  first flex_column_div  column-top-margin'     ><section  class='av_textblock_section av-m0zdp016-78ae0a332e892d2736f780c724084470'   itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/BlogPosting\" itemprop=\"blogPost\" ><div class='avia_textblock'  itemprop=\"text\" ><div class=\"introduction\">\n<div class=\"clearfix text-formatted field field--name-body field--type-text-with-summary field--label-hidden field__item\">\n<div class=\"tex2jax_process\">\n<blockquote>\n<p>Le groupe Nanostructures, nano-Composants et Mol\u00e9cules (NCM), en collaboration avec le groupe Syst\u00e8mes Conjugu\u00e9s Lin\u00e9aires (SCL) \u00e0 Moltech-Anjou (Angers) et le laboratoire de chimie des nouveaux mat\u00e9riaux (U. Mons, Belgique) a d\u00e9velopp\u00e9 des jonctions mol\u00e9culaires con\u00e7ues pour fonctionner comme des commutateurs dans le domaine des fr\u00e9quences t\u00e9rahertz (THz), une avanc\u00e9e significative dans l&rsquo;\u00e9lectronique \u00e0 l&rsquo;\u00e9chelle mol\u00e9culaire.<\/p>\n<\/blockquote>\n<h5 style=\"text-align: center;\">\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-1k5r4vj-af84e01644e33661e6744daff70b018d\">\n.av_font_icon.av-1k5r4vj-af84e01644e33661e6744daff70b018d{\ncolor:#7bb0e7;\nborder-color:#7bb0e7;\n}\n.av_font_icon.av-1k5r4vj-af84e01644e33661e6744daff70b018d .av-icon-char{\nfont-size:22px;\nline-height:22px;\n}\n<\/style>\n<span  class='av_font_icon av-1k5r4vj-af84e01644e33661e6744daff70b018d avia_animate_when_visible av-icon-style- avia-icon-pos-left avia-icon-animate'><span class='av-icon-char' aria-hidden='true' data-av_icon='\ue881' data-av_iconfont='entypo-fontello' ><\/span><\/span><\/h5>\n<p>Ces jonctions mol\u00e9culaires sont constitu\u00e9es de monocouches auto-assembl\u00e9es (SAMs) de mol\u00e9cules pr\u00e9sentant une structure \u03c0-\u03c3-\u03c0. Cette structure comprend deux groupements conjugu\u00e9s (\u03c0) reli\u00e9s par un espaceur non conjugu\u00e9 (\u03c3), une configuration qui permet au dispositif de pr\u00e9senter une conductance diff\u00e9rentielle n\u00e9gative (NDC) \u2014 un ph\u00e9nom\u00e8ne dans lequel une augmentation du voltage \u00e0 travers un dispositif entra\u00eene une diminution du courant.<\/p>\n<h5 style=\"text-align: center;\">\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-1k5r4vj-6-a1ab7cc8c65033f5f46cf5d0f970fb47\">\n.av_font_icon.av-1k5r4vj-6-a1ab7cc8c65033f5f46cf5d0f970fb47{\ncolor:#7bb0e7;\nborder-color:#7bb0e7;\n}\n.av_font_icon.av-1k5r4vj-6-a1ab7cc8c65033f5f46cf5d0f970fb47 .av-icon-char{\nfont-size:22px;\nline-height:22px;\n}\n<\/style>\n<span  class='av_font_icon av-1k5r4vj-6-a1ab7cc8c65033f5f46cf5d0f970fb47 avia_animate_when_visible av-icon-style- avia-icon-pos-left avia-icon-animate'><span class='av-icon-char' aria-hidden='true' data-av_icon='\ue881' data-av_iconfont='entypo-fontello' ><\/span><\/span><\/h5>\n<p>Le NDC survient lorsque la tension \u00e9lectrique appliqu\u00e9e aligne les niveaux d&rsquo;\u00e9nergie des deux sous-unit\u00e9s conjugu\u00e9es, g\u00e9n\u00e9rant un pic de courant, suivi d&rsquo;une diminution lorsque ces niveaux se d\u00e9salignent. Cette propri\u00e9t\u00e9 est essentielle pour le fonctionnement des commutateurs mol\u00e9culaires, jouant un r\u00f4le crucial dans la transition entre des \u00e9tats de haute et de basse conductance sous l&rsquo;influence d&rsquo;une irradiation t\u00e9rahertz.<\/p>\n<h5 style=\"text-align: center;\">\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-1k5r4vj-5-5f9c012228e1cbc445e4ccd1ee63a2fd\">\n.av_font_icon.av-1k5r4vj-5-5f9c012228e1cbc445e4ccd1ee63a2fd{\ncolor:#7bb0e7;\nborder-color:#7bb0e7;\n}\n.av_font_icon.av-1k5r4vj-5-5f9c012228e1cbc445e4ccd1ee63a2fd .av-icon-char{\nfont-size:22px;\nline-height:22px;\n}\n<\/style>\n<span  class='av_font_icon av-1k5r4vj-5-5f9c012228e1cbc445e4ccd1ee63a2fd avia_animate_when_visible av-icon-style- avia-icon-pos-left avia-icon-animate'><span class='av-icon-char' aria-hidden='true' data-av_icon='\ue881' data-av_iconfont='entypo-fontello' ><\/span><\/span><\/h5>\n<p>L&rsquo;installation exp\u00e9rimentale a consist\u00e9 \u00e0 cr\u00e9er des jonctions mol\u00e9culaires en assemblant soigneusement des SAMs sur des \u00e9lectrodes en or ultra-plates, puis \u00e0 mesurer leurs propri\u00e9t\u00e9s de transport \u00e9lectronique en utilisant la microscopie \u00e0 force atomique conductive (C-AFM) (figure 1.a). Cette technique, combin\u00e9e \u00e0 l&rsquo;irradiation laser t\u00e9rahertz (\u00e0 30THz et \u00e0 2.5THz), a permis d&rsquo;observer et d&rsquo;analyser le comportement de commutation en temps r\u00e9el et \u00e0 temp\u00e9rature ambiante (figure 1. b). Il a \u00e9t\u00e9 d\u00e9couvert qu&rsquo;\u00e0 30 THz, l&rsquo;effet NDC pouvait \u00eatre compl\u00e8tement et r\u00e9versiblement supprim\u00e9 en fonction de la puissance et de la fr\u00e9quence de l&rsquo;onde t\u00e9rahertz, ce qui constitue non seulement une r\u00e9alisation exp\u00e9rimentale majeure, mais aussi une validation des pr\u00e9dictions th\u00e9oriques (figure 1.c). Ce comportement indique une interaction hautement sensible entre les jonctions mol\u00e9culaires et le champ t\u00e9rahertz, soulignant le potentiel de ces jonctions pour \u00eatre utilis\u00e9es dans des d\u00e9tecteurs t\u00e9rahertz avanc\u00e9s.<\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div><\/section><\/div>\n<div  class='flex_column av-x0l4xb-ff534b8b6e4997f151406b52b8270fd5 av_one_half  avia-builder-el-6  el_after_av_one_half  el_before_av_hr  flex_column_div  column-top-margin'     ><section  class='av_textblock_section av-m0zdpac4-c5ddbf336d7d6f835220075d3c1ed3c9'   itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/BlogPosting\" itemprop=\"blogPost\" ><div class='avia_textblock'  itemprop=\"text\" ><div class=\"introduction\">\n<div class=\"clearfix text-formatted field field--name-body field--type-text-with-summary field--label-hidden field__item\">\n<div class=\"tex2jax_process\">\n<h5 style=\"text-align: center;\">\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-1k5r4vj-4-2f69eccfbe9299ca8620b83ce930e7d6\">\n.av_font_icon.av-1k5r4vj-4-2f69eccfbe9299ca8620b83ce930e7d6{\ncolor:#7bb0e7;\nborder-color:#7bb0e7;\n}\n.av_font_icon.av-1k5r4vj-4-2f69eccfbe9299ca8620b83ce930e7d6 .av-icon-char{\nfont-size:22px;\nline-height:22px;\n}\n<\/style>\n<span  class='av_font_icon av-1k5r4vj-4-2f69eccfbe9299ca8620b83ce930e7d6 avia_animate_when_visible av-icon-style- avia-icon-pos-left avia-icon-animate'><span class='av-icon-char' aria-hidden='true' data-av_icon='\ue881' data-av_iconfont='entypo-fontello' ><\/span><\/span><\/h5>\n<p>Le m\u00e9canisme de suppression des effets NDC sous irradiation t\u00e9rahertz repose sur une interaction dynamique entre l&rsquo;onde THz et les orbitales mol\u00e9culaires des deux sous-unit\u00e9s du syst\u00e8me mol\u00e9culaire. Cette interaction induit un transfert de charge r\u00e9sonant entre les niveaux d&rsquo;\u00e9nergie des mol\u00e9cules, ce qui entra\u00eene une r\u00e9duction du courant au niveau des pics de conductance. De plus, l&rsquo;effet de suppression est renforc\u00e9 par un ph\u00e9nom\u00e8ne connu sous le nom de<span style=\"color: #000000;\"> \u00ab\u00a0destruction coh\u00e9rente de l&rsquo;effet tunnel\u00a0\u00bb<\/span>, o\u00f9 l&rsquo;irradiation t\u00e9rahertz d\u00e9sactive temporairement le passage des \u00e9lectrons \u00e0 travers la jonction mol\u00e9culaire, r\u00e9duisant ainsi la conductance globale. La pr\u00e9sence de polaritons de plasmon de surface, en interaction avec les niveaux mol\u00e9culaires, contribue \u00e9galement \u00e0 cette suppression.<\/p>\n<\/div>\n<\/div>\n<\/div>\n<div class=\"section-elements\">\n<h5 style=\"text-align: center;\">\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-1k5r4vj-3-c834c959116332a99d7b0fdbe43dcd4a\">\n.av_font_icon.av-1k5r4vj-3-c834c959116332a99d7b0fdbe43dcd4a{\ncolor:#7bb0e7;\nborder-color:#7bb0e7;\n}\n.av_font_icon.av-1k5r4vj-3-c834c959116332a99d7b0fdbe43dcd4a .av-icon-char{\nfont-size:22px;\nline-height:22px;\n}\n<\/style>\n<span  class='av_font_icon av-1k5r4vj-3-c834c959116332a99d7b0fdbe43dcd4a avia_animate_when_visible av-icon-style- avia-icon-pos-left avia-icon-animate'><span class='av-icon-char' aria-hidden='true' data-av_icon='\ue881' data-av_iconfont='entypo-fontello' ><\/span><\/span><\/h5>\n<p>Cependant, lorsque les dispositifs ont \u00e9t\u00e9 soumis \u00e0 une irradiation de 2,5 THz, la suppression du comportement NDC n&rsquo;a pas \u00e9t\u00e9 observ\u00e9e. Cela indique que l&rsquo;\u00e9nergie photonique de 2,5 THz (environ 10 meV) est insuffisante pour induire le m\u00eame effet de suppression que celui observ\u00e9 \u00e0 30 THz. Ces r\u00e9sultats soulignent l&rsquo;importance de la fr\u00e9quence de l&rsquo;irradiation t\u00e9rahertz dans le fonctionnement du commutateur mol\u00e9culaire, d\u00e9montrant ainsi que la r\u00e9ponse du dispositif est fortement d\u00e9pendante de l&rsquo;\u00e9nergie des photons incident.<\/p>\n<h5 style=\"text-align: center;\">\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-1k5r4vj-2-05c5e6aeb7a053b3af9d5107771d266e\">\n.av_font_icon.av-1k5r4vj-2-05c5e6aeb7a053b3af9d5107771d266e{\ncolor:#7bb0e7;\nborder-color:#7bb0e7;\n}\n.av_font_icon.av-1k5r4vj-2-05c5e6aeb7a053b3af9d5107771d266e .av-icon-char{\nfont-size:22px;\nline-height:22px;\n}\n<\/style>\n<span  class='av_font_icon av-1k5r4vj-2-05c5e6aeb7a053b3af9d5107771d266e avia_animate_when_visible av-icon-style- avia-icon-pos-left avia-icon-animate'><span class='av-icon-char' aria-hidden='true' data-av_icon='\ue881' data-av_iconfont='entypo-fontello' ><\/span><\/span><\/h5>\n<p>En regardant vers l&rsquo;avenir, l&rsquo;int\u00e9gration de ces commutateurs mol\u00e9culaires dans des d\u00e9tecteurs t\u00e9rahertz pratiques semble possible. L\u2019\u00e9quipe propose d&rsquo;utiliser des \u00e9lectrodes transparentes de grande surface, telles que le graph\u00e8ne monocouche, qui serait presque transparent aux ondes t\u00e9rahertz, facilitant ainsi le processus de d\u00e9tection. De plus, la nature modifiable des mol\u00e9cules par ing\u00e9nierie chimique permettrait d&rsquo;ajuster la r\u00e9ponse en fr\u00e9quence de ces dispositifs en modifiant les groupements conjugu\u00e9s \u03c0, \u00e9largissant ainsi leur applicabilit\u00e9 \u00e0 travers une gamme de fr\u00e9quences t\u00e9rahertz.<\/p>\n<\/div>\n<div class=\"tex2jax_process\"><\/div>\n<\/div><\/section><\/div>\n\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-lyydekit-0abbee231ff3a63bb08d21586e81d83b\">\n#top .hr.av-lyydekit-0abbee231ff3a63bb08d21586e81d83b{\nmargin-top:30px;\nmargin-bottom:30px;\n}\n.hr.av-lyydekit-0abbee231ff3a63bb08d21586e81d83b .hr-inner{\nwidth:200;\nmax-width:45%;\n}\n<\/style>\n<div  class='hr av-lyydekit-0abbee231ff3a63bb08d21586e81d83b hr-custom  avia-builder-el-11  el_after_av_one_half  el_before_av_textblock  hr-center hr-icon-yes'><span class='hr-inner inner-border-av-border-fat'><span class=\"hr-inner-style\"><\/span><\/span><span class='av-seperator-icon' aria-hidden='true' data-av_icon='\ue808' data-av_iconfont='entypo-fontello'><\/span><span class='hr-inner inner-border-av-border-fat'><span class=\"hr-inner-style\"><\/span><\/span><\/div>\n<section  class='av_textblock_section av-m0zds1n8-0ae420d0ec3e7e5838010ba2a6a5994f'   itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/BlogPosting\" itemprop=\"blogPost\" ><div class='avia_textblock'  itemprop=\"text\" ><div class=\"introduction\">\n<div class=\"clearfix text-formatted field field--name-body field--type-text-with-summary field--label-hidden field__item\">\n<div class=\"tex2jax_process\"><\/div>\n<\/div>\n<\/div>\n<div class=\"tex2jax_process\"><\/div>\n<p style=\"text-align: center;\"><a href=\"https:\/\/www.iemn.fr\/wp-content\/uploads\/2024\/09\/visuelImen.png\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-70421\" src=\"https:\/\/www.iemn.fr\/wp-content\/uploads\/2024\/09\/visuelImen.png\" alt=\"\" width=\"700\" height=\"382\" srcset=\"https:\/\/www.iemn.fr\/wp-content\/uploads\/2024\/09\/visuelImen.png 900w, https:\/\/www.iemn.fr\/wp-content\/uploads\/2024\/09\/visuelImen-300x164.png 300w, https:\/\/www.iemn.fr\/wp-content\/uploads\/2024\/09\/visuelImen-768x419.png 768w, https:\/\/www.iemn.fr\/wp-content\/uploads\/2024\/09\/visuelImen-18x10.png 18w, https:\/\/www.iemn.fr\/wp-content\/uploads\/2024\/09\/visuelImen-705x385.png 705w\" sizes=\"auto, (max-width: 700px) 100vw, 700px\" \/><\/a><\/p>\n<h5 style=\"text-align: center;\">\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-1k5r4vj-1-6a85bea365bde3b1033c5c2369e541a2\">\n.av_font_icon.av-1k5r4vj-1-6a85bea365bde3b1033c5c2369e541a2{\ncolor:#7bb0e7;\nborder-color:#7bb0e7;\n}\n.av_font_icon.av-1k5r4vj-1-6a85bea365bde3b1033c5c2369e541a2 .av-icon-char{\nfont-size:22px;\nline-height:22px;\n}\n<\/style>\n<span  class='av_font_icon av-1k5r4vj-1-6a85bea365bde3b1033c5c2369e541a2 avia_animate_when_visible av-icon-style- avia-icon-pos-left avia-icon-animate'><span class='av-icon-char' aria-hidden='true' data-av_icon='\ue881' data-av_iconfont='entypo-fontello' ><\/span><\/span><\/h5>\n<h5><span style=\"text-decoration: underline;\">Plus d&rsquo;informations <\/span><strong>:<\/strong><\/h5>\n<p>Nano Letters : <a class=\"\" href=\"https:\/\/pubs.acs.org\/doi\/10.1021\/acs.nanolett.3c04602\" target=\"_blank\" rel=\"noopener\">https:\/\/pubs.acs.org\/doi\/10.1021\/acs.nanolett.3c04602<\/a><\/p>\n<p>ArXiv : <a class=\"\" href=\"https:\/\/arxiv.org\/abs\/2310.08916\" target=\"_blank\" rel=\"noopener\">https:\/\/arxiv.org\/abs\/2310.08916<\/a><\/p>\n<p><strong> <div  class='avia-button-wrap av-11vv5f3-d6d9ff38d2e28918218c5098b8df944d-wrap avia-button-left  avia-builder-el-14  el_after_av_font_icon  el_before_av_button'><a href='mailto:imen.hnid@univ-lille.fr'  class='avia-button av-11vv5f3-d6d9ff38d2e28918218c5098b8df944d av-link-btn avia-icon_select-yes-left-icon avia-size-small avia-position-left avia-color-silver'   aria-label=\"Contact: Imen Hnid\"><span class='avia_button_icon avia_button_icon_left' aria-hidden='true' data-av_icon='\ue805' data-av_iconfont='entypo-fontello'><\/span><span class='avia_iconbox_title' >Contact: Imen Hnid<\/span><\/a><\/div> \u00a0 <\/strong><strong><div  class='avia-button-wrap av-m69cq7-4a97b48632c89e1d5f7dbfd9c0a5fb6d-wrap avia-button-left  avia-builder-el-15  el_after_av_button  avia-builder-el-last'><a href='mailto:dominique.vuillaume@iemn.fr'  class='avia-button av-m69cq7-4a97b48632c89e1d5f7dbfd9c0a5fb6d av-link-btn avia-icon_select-yes-left-icon avia-size-small avia-position-left avia-color-silver'   aria-label=\"Contact: Dominique Vuillaume\"><span class='avia_button_icon avia_button_icon_left' aria-hidden='true' data-av_icon='\ue805' data-av_iconfont='entypo-fontello'><\/span><span class='avia_iconbox_title' >Contact: Dominique Vuillaume<\/span><\/a><\/div><\/strong><\/p>\n<\/div><\/section>","protected":false},"excerpt":{"rendered":"","protected":false},"author":20,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[297],"tags":[],"class_list":["post-69967","post","type-post","status-publish","format-standard","hentry","category-newsletter"],"_links":{"self":[{"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/posts\/69967","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/users\/20"}],"replies":[{"embeddable":true,"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/comments?post=69967"}],"version-history":[{"count":0,"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/posts\/69967\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/media?parent=69967"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/categories?post=69967"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/tags?post=69967"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}