{"id":76656,"date":"2025-12-22T12:00:57","date_gmt":"2025-12-22T10:00:57","guid":{"rendered":"https:\/\/www.iemn.fr\/?p=76656"},"modified":"2025-12-22T12:26:33","modified_gmt":"2025-12-22T10:26:33","slug":"corentin-mercier-15-12-2025-optimisation-thermique-des-commutateurs-rf","status":"publish","type":"post","link":"https:\/\/www.iemn.fr\/en\/a-la-une\/corentin-mercier-15-12-2025-optimisation-thermique-des-commutateurs-rf.html","title":{"rendered":"Corentin MERCIER &#8211; 15\/12\/2025 &#8211; \u00ab Optimisation thermique des commutateurs RF bas\u00e9s sur les mat\u00e9riaux \u00e0 changement de phase pour les communications 5G et au-del\u00e0\u00bb"},"content":{"rendered":"<div id='layer_slider_1'  class='avia-layerslider main_color avia-shadow  avia-builder-el-0  el_before_av_heading  avia-builder-el-first  container_wrap sidebar_right'  style='height: 261px;'  ><div id=\"layerslider_58_pihimvigapeo\" data-ls-slug=\"homepageslider\" class=\"ls-wp-container fitvidsignore ls-selectable\" style=\"width:1140px;height:260px;margin:0 auto;margin-bottom: 0px;\"><div class=\"ls-slide\" data-ls=\"duration:6000;transition2d:5;\"><img loading=\"lazy\" decoding=\"async\" width=\"2600\" height=\"270\" src=\"https:\/\/www.iemn.fr\/wp-content\/uploads\/2019\/01\/sliders_news1.jpg\" class=\"ls-bg\" alt=\"\" srcset=\"https:\/\/www.iemn.fr\/wp-content\/uploads\/2019\/01\/sliders_news1.jpg 2600w, https:\/\/www.iemn.fr\/wp-content\/uploads\/2019\/01\/sliders_news1-300x31.jpg 300w, https:\/\/www.iemn.fr\/wp-content\/uploads\/2019\/01\/sliders_news1-768x80.jpg 768w, https:\/\/www.iemn.fr\/wp-content\/uploads\/2019\/01\/sliders_news1-1030x107.jpg 1030w, https:\/\/www.iemn.fr\/wp-content\/uploads\/2019\/01\/sliders_news1-1500x156.jpg 1500w, https:\/\/www.iemn.fr\/wp-content\/uploads\/2019\/01\/sliders_news1-705x73.jpg 705w\" sizes=\"auto, (max-width: 2600px) 100vw, 2600px\" \/><ls-layer style=\"font-size:14px;text-align:left;font-style:normal;text-decoration:none;text-transform:none;font-weight:700;letter-spacing:0px;border-style:solid;border-color:#000;background-position:0% 0%;background-repeat:no-repeat;width:180px;height:30px;left:0px;top:231px;line-height:32px;color:#ffffff;border-radius:6px 6px 6px 6px;padding-left:50px;background-color:rgba(0, 0, 0, 0.57);\" class=\"ls-l ls-ib-icon ls-text-layer\" data-ls=\"minfontsize:0;minmobilefontsize:0;\"><i class=\"fa fa-quote-right\" style=\"color:#ffffff;margin-right:0.8em;font-size:1em;transform:translateY( -0.125em );\"><\/i>ACTUALITES<\/ls-layer><\/div><\/div><\/div><div id='after_layer_slider_1'  class='main_color av_default_container_wrap container_wrap sidebar_right'  ><div class='container av-section-cont-open' ><div class='template-page content  av-content-small alpha units'><div class='post-entry post-entry-type-page post-entry-76656'><div class='entry-content-wrapper clearfix'>\n\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-mih9a83v-165e232d84b8a83f1af2515fbd0b0e20\">\n#top .av-special-heading.av-mih9a83v-165e232d84b8a83f1af2515fbd0b0e20{\nmargin:0 0 10px 0;\npadding-bottom:4px;\ncolor:#e58302;\n}\nbody .av-special-heading.av-mih9a83v-165e232d84b8a83f1af2515fbd0b0e20 .av-special-heading-tag .heading-char{\nfont-size:25px;\n}\n.av-special-heading.av-mih9a83v-165e232d84b8a83f1af2515fbd0b0e20 .special-heading-inner-border{\nborder-color:#e58302;\n}\n.av-special-heading.av-mih9a83v-165e232d84b8a83f1af2515fbd0b0e20 .av-subheading{\nfont-size:15px;\n}\n<\/style>\n<div  class='av-special-heading av-mih9a83v-165e232d84b8a83f1af2515fbd0b0e20 av-special-heading-h2 custom-color-heading  avia-builder-el-1  el_after_av_layerslider  el_before_av_hr  avia-builder-el-first  av-linked-heading'><h2 class='av-special-heading-tag'  itemprop=\"headline\"  >THESE : Corentin MERCIER &#8211; 15\/12\/2025 &#8211; \u00ab Optimisation thermique des commutateurs RF bas\u00e9s sur les mat\u00e9riaux \u00e0 changement de phase pour les communications 5G et au-del\u00e0\u00bb <\/h2><div class=\"special-heading-border\"><div class=\"special-heading-inner-border\"><\/div><\/div><\/div>\n\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-18u73nj-dad6a947580930e400fc42ba200e80f1\">\n#top .hr.av-18u73nj-dad6a947580930e400fc42ba200e80f1{\nmargin-top:5px;\nmargin-bottom:5px;\n}\n.hr.av-18u73nj-dad6a947580930e400fc42ba200e80f1 .hr-inner{\nwidth:100%;\n}\n<\/style>\n<div  class='hr av-18u73nj-dad6a947580930e400fc42ba200e80f1 hr-custom  avia-builder-el-2  el_after_av_heading  el_before_av_textblock  hr-left hr-icon-no'><span class='hr-inner inner-border-av-border-thin'><span class=\"hr-inner-style\"><\/span><\/span><\/div>\n<section  class='av_textblock_section av-jriy64i8-fd5f2e9d63bf552d6910d12f255eb26e'   itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/BlogPosting\" itemprop=\"blogPost\" ><div class='avia_textblock'  itemprop=\"text\" >\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-13ewzjw-649e41ac67c26b53aa0b3d91d18e5f5a\">\n.av_font_icon.av-13ewzjw-649e41ac67c26b53aa0b3d91d18e5f5a{\ncolor:#e58302;\nborder-color:#e58302;\n}\n.av_font_icon.av-13ewzjw-649e41ac67c26b53aa0b3d91d18e5f5a .av-icon-char{\nfont-size:60px;\nline-height:60px;\n}\n<\/style>\n<span  class='av_font_icon av-13ewzjw-649e41ac67c26b53aa0b3d91d18e5f5a 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='\ue8c9' data-av_iconfont='entypo-fontello' ><\/span><\/span>\n<h4><span style=\"color: #ff9900;\"><strong>Corentin MERCIER<\/strong><\/span><\/h4>\n<p><strong>Le 15 d\u00e9cembre 2025 \u00e0 10h00<br \/>\n<\/strong>Amphith\u00e9\u00e2tre LCI<\/p>\n<\/div><\/section>\n<section  class='av_textblock_section av-jtefqx33-26fa44c544b10063385818eda37e027b'   itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/BlogPosting\" itemprop=\"blogPost\" ><div class='avia_textblock'  itemprop=\"text\" ><div  class='hr av-kjh3zw-4dff888f744b728a1aca9b3a0971493a hr-default  avia-builder-el-6  avia-builder-el-no-sibling'><span class='hr-inner'><span class=\"hr-inner-style\"><\/span><\/span><\/div>\n<h5><strong><span style=\"color: #800000;\">Jury :<\/span><\/strong><\/h5>\n<ul>\n<li><b>M. Pierre BLONDY, <\/b><i>Professeur des universit\u00e9s, XLIM,<\/i><b>\u00a0Rapporteur<\/b><\/li>\n<li><b>Mme Florence PODEVIN, <\/b><i>Professeure des universit\u00e9s, Institut Polytechnique de Grenoble, <\/i><b>Rapporteure<\/b><\/li>\n<li><b>M. Bruno REIG<\/b><i>, Ing\u00e9nieur de recherche, CEA-LETI, <\/i><b>Examinateur<\/b><\/li>\n<li><b>Mme Magali PUTERO, <\/b><i>Professeure des universit\u00e9s, Aix-Marseille Universit\u00e9,<\/i><b>\u00a0Examinatrice<\/b><\/li>\n<li><b>M. Jean-Fran\u00e7ois ROBILLARD, <\/b><i>Enseignant-Chercheur, Junia, Lille<\/i><b>\u00a0Directeur de th\u00e8se<\/b><\/li>\n<li><b>M. Emmanuel DUBOIS, <\/b><i>Directeur de recherche CNRS, ISEN-IEMN, Lille, <\/i><b>Directeur de th\u00e8se<\/b><\/li>\n<li><b>M. St\u00e9phane MONFRAY, <\/b><i>Ing\u00e9nieur R&amp;D, STMicroelectronics, Crolles, <\/i><b>Invit\u00e9<\/b><\/li>\n<li><b>M. Alain FLEURY, <\/b><i>Ing\u00e9nieur R&amp;D, STMicroelectronics, Crolles,<\/i><b>\u00a0Invit\u00e9<\/b><\/li>\n<\/ul>\n<h5><span style=\"color: #800000;\">Summary:<\/span><\/h5>\n<div class=\"elementToProof\">L\u2019augmentation massive des \u00e9changes de donn\u00e9es \u00e0 l\u2019\u00e9chelle mondiale impose la conception de technologies de communication \u00e0 haute performance. Les commutateurs radiofr\u00e9quence (RF) \u00e0 base de mat\u00e9riaux \u00e0 changement de phase (PCM), dont la conductivit\u00e9 \u00e9lectrique est modul\u00e9e par une transition de phase thermique, apparaissent comme une solution prometteuse, notamment dans le cadre d\u2019exploitations de nouvelles bandes de fr\u00e9quences plus \u00e9lev\u00e9es offrant des d\u00e9bits plus rapides. Toutefois, pour \u00eatre comp\u00e9titifs, ces dispositifs doivent offrir \u00e0 la fois une excellente tenue en puissance et des performances RF optimales.<\/div>\n<div class=\"elementToProof\">Ce travail de th\u00e8se propose une d\u00e9marche d\u2019optimisation de ces commutateurs, en s\u2019appuyant sur des simulations par \u00e9l\u00e9ments finis pour analyser l\u2019influence des param\u00e8tres g\u00e9om\u00e9triques, des mat\u00e9riaux utilis\u00e9s et des strat\u00e9gies de chauffage. De nouveaux designs sont propos\u00e9s afin d\u2019am\u00e9liorer l\u2019efficacit\u00e9 de la commutation, notamment en augmentant la quantit\u00e9 de PCM amorphis\u00e9 \u00e0 l\u2019\u00e9tat OFF, ce qui permet de r\u00e9duire les pertes parasites et d\u2019augmenter la stabilit\u00e9 thermique.<\/div>\n<div class=\"elementToProof\">Les dispositifs issus de cette d\u00e9marche pr\u00e9sentent, apr\u00e8s fabrication et caract\u00e9risation, des avanc\u00e9es notables. L\u2019ajout de couches thermiquement conductrices et l\u2019adoption d\u2019architectures sp\u00e9cifiques ont permis d\u2019optimiser l\u2019\u00e9vacuation de la chaleur, conduisant \u00e0 une am\u00e9lioration de la tenue en puissance \u00e0 l\u2019\u00e9tat OFF de 5 dBm pour des structures en s\u00e9rie. Par ailleurs, l\u2019impl\u00e9mentation de structures chauffantes multibranches a permis d\u2019atteindre des tenues en puissance de 37 dBm \u00e0 l\u2019\u00e9tat OFF et de 35 dBm \u00e0 l\u2019\u00e9tat ON. Ces r\u00e9sultats s\u2019accompagnent d\u2019une diminution de 20 % des capacit\u00e9s parasites \u00e0 l\u2019\u00e9tat OFF, sans compromis sur la r\u00e9sistance \u00e0 l\u2019\u00e9tat ON, ainsi que d\u2019une r\u00e9duction de 16 % de la consommation \u00e9nerg\u00e9tique.<\/div>\n<div class=\"elementToProof\">Enfin, une mod\u00e9lisation bas\u00e9e sur la m\u00e9thode \u00ab champ de phase \u00bb a \u00e9t\u00e9 int\u00e9gr\u00e9e \u00e0 l\u2019environnement de simulation pour suivre l\u2019\u00e9volution microstructurale du PCM lors de la commutation. Cette approche permet de comparer le comportement de mat\u00e9riaux comme le GST et le GeTe, ce dernier montrant une meilleure stabilit\u00e9 de phase \u00e0 l\u2019\u00e9tat OFF, et confirmant son int\u00e9r\u00eat pour les applications RF.<\/div>\n<h5><span style=\"color: #800000;\">Abstract:<\/span><\/h5>\n<div class=\"elementToProof\">The exponential growth in global data exchange is placing increasing demands on high-performance communication technologies. Among emerging solutions, radio-frequency (RF) switches based on phase-change materials (PCMs), which modulate electrical conductivity via thermally induced phase transitions, show significant promise, especially for operation in higher-frequency bands that support faster data rates. To compete with established technologies, however, these devices must offer both robust power handling and excellent RF performance.<\/div>\n<div class=\"elementToProof\">This thesis presents a comprehensive optimization strategy for PCM-based RF switches, grounded in finite element simulations to evaluate the impact of device geometry, material selection, and thermal actuation methods. New design approaches are proposed to enhance switching efficiency, primarily by increasing the volume of amorphized PCM in the OFF state, leading to reduced parasitic losses and improved thermal stability.<\/div>\n<div class=\"elementToProof\">Fabricated and experimentally characterized devices exhibit substantial performance gains. The use of thermally conductive layers, together with tailored thermal management architectures, significantly improves heat dissipation and enables OFF-state power handling improvement of up to 5 dBm in series-configured switches. Furthermore, the implementation of multi-branch heating structures allows the switches to sustain power levels of up to 37 dBm in the OFF state and 35 dBm in the ON state. These enhancements are accompanied by a 20 % reduction in OFF-state parasitic capacitance, with no degradation in ON-state resistance, and a 16 % reduction in overall energy consumption.<\/div>\n<div class=\"elementToProof\">In parallel, a Phase-Field modeling framework has been integrated into the simulation environment to track the microstructural evolution of the PCM during switching. This approach enables direct comparison between materials such as GST and GeTe, with GeTe demonstrating superior phase stability in the OFF state, highlighting its suitability for next-generation RF applications.<\/div>\n<\/div><\/section>","protected":false},"excerpt":{"rendered":"","protected":false},"author":20,"featured_media":71083,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3,8,199],"tags":[],"class_list":["post-76656","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-a-la-une","category-actualites","category-these"],"_links":{"self":[{"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/posts\/76656","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=76656"}],"version-history":[{"count":2,"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/posts\/76656\/revisions"}],"predecessor-version":[{"id":76681,"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/posts\/76656\/revisions\/76681"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/media\/71083"}],"wp:attachment":[{"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/media?parent=76656"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/categories?post=76656"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/tags?post=76656"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}