{"id":38625,"date":"2019-12-12T14:51:24","date_gmt":"2019-12-12T12:51:24","guid":{"rendered":"https:\/\/www.iemn.fr\/?p=38625"},"modified":"2020-01-10T16:08:47","modified_gmt":"2020-01-10T14:08:47","slug":"soutenance-de-these-tianqi-zhu-convertisseurs-thermoelectronique-a-gap-micrometrique-materiaux-conception-et-fabrication-dun-demonstrateur","status":"publish","type":"post","link":"https:\/\/www.iemn.fr\/en\/actualites\/soutenance-de-these-tianqi-zhu-convertisseurs-thermoelectronique-a-gap-micrometrique-materiaux-conception-et-fabrication-dun-demonstrateur.html","title":{"rendered":"Soutenance de th\u00e8se: Tianqi ZHU \u2013 Convertisseurs thermo\u00e9lectroniques \u00e0 gap microm\u00e9trique : mat\u00e9riaux, conception et fabrication d\u2019un d\u00e9monstrateur"},"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_1sgbx9a50hjyd\" 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-38625'><div class='entry-content-wrapper clearfix'>\n\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-k42r03xk-1536820913bf5cd321eca025a3d21562\">\n#top .av-special-heading.av-k42r03xk-1536820913bf5cd321eca025a3d21562{\nmargin:0 0 10px 0;\npadding-bottom:4px;\n}\nbody .av-special-heading.av-k42r03xk-1536820913bf5cd321eca025a3d21562 .av-special-heading-tag .heading-char{\nfont-size:25px;\n}\n.av-special-heading.av-k42r03xk-1536820913bf5cd321eca025a3d21562 .av-subheading{\nfont-size:15px;\n}\n<\/style>\n<div  class='av-special-heading av-k42r03xk-1536820913bf5cd321eca025a3d21562 av-special-heading-h2  avia-builder-el-1  el_after_av_layerslider  el_before_av_hr  avia-builder-el-first'><h2 class='av-special-heading-tag'  itemprop=\"headline\"  >THESE : Convertisseurs thermo\u00e9lectroniques \u00e0 gap microm\u00e9trique : mat\u00e9riaux, conception et fabrication d\u2019un d\u00e9monstrateur <\/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-jriy64i8-2f4600354c0449b610997916bbd9b6bc'   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-68e036126b913e5028f77311dc66b825\">\n.av_font_icon.av-13ewzjw-68e036126b913e5028f77311dc66b825{\ncolor:#bfbfbf;\nborder-color:#bfbfbf;\n}\n.av_font_icon.av-13ewzjw-68e036126b913e5028f77311dc66b825 .av-icon-char{\nfont-size:60px;\nline-height:60px;\n}\n<\/style>\n<span  class='av_font_icon av-13ewzjw-68e036126b913e5028f77311dc66b825 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<h5><strong style=\"font-size: 16px;\">Tianqi ZHU<\/strong><\/h5>\n<p><strong>Jeudi 19 d\u00e9cembre 2019 \u00e0 10h30<\/strong><br \/>\nAmphith\u00e9\u00e2tre de l&rsquo;ISEN\/IEMN, Institut Sup\u00e9rieur d&rsquo;Electronique et du Num\u00e9rique<br \/>\n41 Boulevard Vauban, 59046 Lille<\/p>\n<\/div><\/section>\n<section  class='av_textblock_section av-jtefqx33-628129dba2299b2ecd65ebfc92eac29d'   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>Karl JOULAIN, Professeur des Universit\u00e9s, Institut P&rsquo;, Poitiers (Rapporteur)<\/li>\n<li>Aomar HALIMAOUI, Ing\u00e9nieur de Recherche, STMicroelectronics, Crolles (Rapporteur)<\/li>\n<li>Xiaohui TANG, Charg\u00e9e de Recherche, ICTEAM, EPL, Universit\u00e9 Catholique de Louvain (Examinatrice)<\/li>\n<li>Katir ZIOUCHE, Professeur des Universit\u00e9s, Universit\u00e9 de Lille (Examinateur)<u><br \/>\n<\/u>St\u00e9phane MONFRAY, Ing\u00e9nieur de Recherche, STMicroelectronics, Crolles (Membre Invit\u00e9)<\/li>\n<li>Emmanuel DUBOIS Directeur de Recherche CNRS, IEMN, Villeneuve d\u2019Ascq (Directeur de th\u00e8se)<\/li>\n<li>Jean-Fran\u00e7ois ROBILLARD, Professeur Associ\u00e9, IEMN\/ISEN\/Yncr\u00e9a Hauts-de-France, Lille (Co-encadrant)<\/li>\n<\/ul>\n<h5>Summary:<\/h5>\n<p>La conversion thermo\u00e9lectrique \u00e0 l\u2019\u00e9tat solide, qui produit de l\u2019\u00e9lectricit\u00e9 de mani\u00e8re directe, silencieuse, sans vibrations ni entretien, rev\u00eat le plus grand int\u00e9r\u00eat pour la r\u00e9cup\u00e9ration d\u2019\u00e9nergie. L&rsquo;\u00e9nergie thermique est une source abondante et bien distribu\u00e9e, ce qui fait de la thermo\u00e9lectricit\u00e9 une bonne solution pour r\u00e9pondre \u00e0 la demande croissante en \u00e9nergie. En particulier, elle est envisag\u00e9e comme une solution pour l\u2019alimentation de faible puissance des appareils \u00e9lectroniques autonomes, ce que l\u2019on appelle aussi l\u2019internet des objets. Les g\u00e9n\u00e9rateurs thermo\u00e9lectriques conventionnels (TEG), bas\u00e9s sur l&rsquo;effet Seebeck, g\u00e9n\u00e8rent de l&rsquo;\u00e9nergie \u00e9lectrique gr\u00e2ce \u00e0 des mat\u00e9riaux \u00e0 l&rsquo;\u00e9tat solide soumis \u00e0 un gradient de temp\u00e9rature. Le m\u00e9canisme de ce moteur thermique engendre un \u00e9norme flux thermique, ce qui explique leur faible rendement inh\u00e9rent. De nature radicalement diff\u00e9rente, la structure du convertisseur thermo\u00e9lectronique \u00e0 vide microm\u00e9trique (MTC) bas\u00e9e sur l\u2019\u00e9mission thermo\u00e9lectronique \u00e9limine pratiquement les pertes thermiques tout en conservant toutes les caract\u00e9ristiques attractives de la thermo\u00e9lectricit\u00e9. Dans ce travail, le concept de convertisseur thermo\u00e9lectronique est revisit\u00e9 sur la base de rev\u00eatements \u00e0 faible travail d\u2019extraction et en tirant parti des technologies de fabrication traditionnelles des MEMS pour la fabrication de paires d&rsquo;\u00e9lectrodes \u00e0 espacements microm\u00e9triques contr\u00f4l\u00e9s. Premi\u00e8rement, les oxydes alcalins sont d\u00e9pos\u00e9s et caract\u00e9ris\u00e9s. Le compos\u00e9 d&rsquo;oxyde de c\u00e9sium peut r\u00e9duire le travail de sortie du silicium de pr\u00e8s de 3eV \u00e0 partir d&rsquo;une valeur initiale d&rsquo;environ 4,2eV. Deuxi\u00e8mement, une \u00e9tude num\u00e9rique est men\u00e9e sur le transfert thermique au sein du dispositif pour concevoir le convertisseur. Enfin, un processus de micro et nano-fabrication est d\u00e9velopp\u00e9 pour fabriquer un d\u00e9monstrateur MTC.<\/p>\n<h5>Abstract:<\/h5>\n<p>Solid-state thermoelectric conversion, which generates electricity in a direct, silent, vibration-free and maintenance-free way, is of the greatest interest for energy harvesting. The thermal energy is an abundant source for electrical generation, which makes thermoelectricity a good solution to meet the increasing demand for energy. Especially, it is seen as a tool towards low power supply for autonomous electronic devices, as field also known as internet-of-things. Conventional thermoelectric generators (TEG), based on Seebeck effect, generate electric power based on solid-states materials submitted to a temperature gradient. The mechanism of this thermal engine results in a huge thermal flow, which explains their inherent low efficiency. Radically different in nature, the structure of micro-vacuum-gap thermionic converter (MTC) based on thermionic emission virtually eliminates the thermal losses while keeping all attracting features of thermoelectricity. In this work, the concept of thermionic converter is revisited based on low workfunction coatings and benefiting from mainstream fabrication technologies of MEMS to fabricate electrode pairs with controlled micrometer gaps. Firstly, alkali oxides are deposited and characterized. We find that the cesium oxide compound can reduce the work function of silicon by almost 3eV from an initial value of about 4.2eV. Secondly, a numerical study is lead on the thermal transfer within the device to propose a design. Finally, a micro and nano\u00adfabrication process is developed to fabricate a MTC demonstrator.<\/p>\n<\/div><\/section>","protected":false},"excerpt":{"rendered":"","protected":false},"author":2,"featured_media":38632,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[8],"tags":[],"class_list":["post-38625","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-actualites"],"_links":{"self":[{"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/posts\/38625","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\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/comments?post=38625"}],"version-history":[{"count":0,"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/posts\/38625\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/media\/38632"}],"wp:attachment":[{"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/media?parent=38625"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/categories?post=38625"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/tags?post=38625"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}