{"id":60212,"date":"2023-10-03T14:43:15","date_gmt":"2023-10-03T12:43:15","guid":{"rendered":"https:\/\/www.iemn.fr\/?p=60212"},"modified":"2023-10-03T14:43:15","modified_gmt":"2023-10-03T12:43:15","slug":"these-bilal-chehaibou-modeling-of-the-optoelectronic-properties-of-colloidal-nanocrystals-for-infrared-imaging-purposes","status":"publish","type":"post","link":"https:\/\/www.iemn.fr\/en\/agenda\/these-bilal-chehaibou-modeling-of-the-optoelectronic-properties-of-colloidal-nanocrystals-for-infrared-imaging-purposes.html","title":{"rendered":"THESE : Bilal CHEHAIBOU \u2013 \u00ab Modeling of the optoelectronic properties of colloidal nanocrystals for infrared imaging purposes \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_668bkxz03jep\" 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-60212'><div class='entry-content-wrapper clearfix'>\n\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-lnaagh2n-93a82609e83ec9eecd1599b535b05821\">\n#top .av-special-heading.av-lnaagh2n-93a82609e83ec9eecd1599b535b05821{\nmargin:0 0 10px 0;\npadding-bottom:4px;\n}\nbody .av-special-heading.av-lnaagh2n-93a82609e83ec9eecd1599b535b05821 .av-special-heading-tag .heading-char{\nfont-size:25px;\n}\n.av-special-heading.av-lnaagh2n-93a82609e83ec9eecd1599b535b05821 .av-subheading{\nfont-size:15px;\n}\n<\/style>\n<div  class='av-special-heading av-lnaagh2n-93a82609e83ec9eecd1599b535b05821 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 : Bilal CHEHAIBOU \u2013 \u00ab Modeling of the optoelectronic properties of colloidal nanocrystals for infrared imaging purposes \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-jriy64i8-2f4600354c0449b610997916bbd9b6bc'   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<p><strong>\u00a0Bilal CHEHAIBOU<\/strong><\/p>\n<p>Soutenance : 17 Octobre \u00e0 10 h <strong><br \/>\n<\/strong>IRCICA \u2013 Villeneuve d\u2019Ascq<\/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<div>\n<div>\n<div class=\"page\" title=\"Page 1\">\n<div class=\"layoutArea\">\n<div class=\"column\">\n<p>\u2013 Herv\u00e9 Rinnert \u2013 Professeur des universit\u00e9s, Universit\u00e9 de Lorraine, Rapporteur<br \/>\n\u2013 Mathieu Luisier \u2013 Professeur, ETH Z\u00fcrich, Rapporteur<br \/>\n\u2013 Soline Boyer-Richard \u2013 Ma\u00eetresse de conf\u00e9rence, INSA Rennes, Examinatrice<br \/>\n\u2013 Arthur Arnaud \u2013 Docteur, STMicroelectronics, Examinateur<br \/>\n\u2013 Christophe Delerue \u2013 Directeur de recherche, IEMN, Directeur de la th\u00e8se<br \/>\n\u2013 Peter Reiss \u2013 Chercheur, chef de laboratoire, CEA Grenoble, Co-directeur de la th\u00e8se<br \/>\n\u2013 Gabriel Mugny \u2013 Docteur, STMicroelectronics, Invit\u00e9<\/p>\n<p>\u2013 Emmanuel Lhuillier \u2013 Charg\u00e9 de recherche, Sorbonne University, Invit\u00e9<\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<div><\/div>\n<h5>Summary:<\/h5>\n<p>Les couches semi-conductrices compos\u00e9es de nanocristaux collo\u00efdaux (NC) ont montr\u00e9 un grand potentiel en tant que mat\u00e9riaux actifs dans les capteurs infrarouges (IR), avec des promesses de r\u00e9duction des co\u00fbts de fabrication et d\u2019am\u00e9lioration des propri\u00e9t\u00e9s opto\u00e9lectroniques. Bien qu\u2019il s\u2019agisse d\u2019une technologie relativement nouvelle, avec la premi\u00e8re synth\u00e8se monodispers\u00e9e il y a 30 ans, d\u2019\u00e9normes progr\u00e8s, notamment dans la synth\u00e8se, l\u2019ing\u00e9nierie de surface, les m\u00e9thodes de d\u00e9p\u00f4t, l\u2019architecture des dispositifs et la physique fondamentale, ont conduit \u00e0 la commercialisation. Cependant, pour atteindre le plein potentiel des capteurs infrarouges NC, des am\u00e9liorations sont encore n\u00e9cessaires, avec un accent particulier sur la compr\u00e9hension et le contr\u00f4le des propri\u00e9t\u00e9s des mat\u00e9riaux et leur d\u00e9pendance \u00e0 l\u2019\u00e9gard de l\u2019environnement.<\/p>\n<p>Dans ce contexte, nous visons \u00e0 combiner des outils exp\u00e9rimentaux et th\u00e9oriques pour \u00e9tudier les propri\u00e9t\u00e9s opto\u00e9lectroniques de NCs isol\u00e9s jusqu\u2019\u00e0 une couche de NCs int\u00e9gr\u00e9s dans des dispositifs \u00e9lectroniques. Dans le premier chapitre, nous avons r\u00e9alis\u00e9 diff\u00e9rentes synth\u00e8ses de NCs collo\u00efdales de PbS qui nous ont permis de mener de nombreuses investigations physico-chimiques allant des propri\u00e9t\u00e9s optiques \u00e0 la caract\u00e9risation de la surface. Dans le deuxi\u00e8me chapitre, nous avons \u00e9tudi\u00e9 la structure \u00e9lectronique de NCs de PbS et de HgTe isol\u00e9s en utilisant des outils th\u00e9oriques avanc\u00e9s tels que la m\u00e9thode Empirical Tight-Binding (ETBM), la th\u00e9orie de la fonctionnelle de la densit\u00e9 (DFT) et la m\u00e9thode du pseudopotentiel empirique (EPM). Nous avons \u00e9tudi\u00e9 l\u2019effet de la taille et de la forme sur la structure \u00e9lectronique et d\u00e9voil\u00e9 une transition de phase topologique 0D dans les NC de HgTe. Le troisi\u00e8me chapitre se concentre sur les propri\u00e9t\u00e9s optiques des NCs de PbS et de HgTe. En utilisant l\u2019ETBM et l\u2019EPM, nous avons reli\u00e9 la structure \u00e9lectronique aux caract\u00e9ristiques essentielles d\u2019un spectre d\u2019absorption exp\u00e9rimental. Dans le quatri\u00e8me chapitre, nous \u00e9tendons les r\u00e9sultats pr\u00e9c\u00e9dents \u00e0 une couche solide compos\u00e9e de NCs dens\u00e9ment emball\u00e9s. Cependant, les propri\u00e9t\u00e9s d\u2019une couche solide sont diff\u00e9rentes de celles d\u2019un NC isol\u00e9, en raison de l\u2019interaction avec l\u2019environnement, en particulier les ligands. Par cons\u00e9quent, en plus des calculs ETBM, nous incluons l\u2019approximation du milieu effectif (EMA) et, en synergie avec les mesures d\u2019ellipsom\u00e9trie spectroscopique, nous avons \u00e9tudi\u00e9 l\u2019effet de la chimie de surface, de la forme et de la taille sur les propri\u00e9t\u00e9s optiques d\u2019une couche de NC. A partir des connaissances accumul\u00e9es dans les chapitres pr\u00e9c\u00e9dents, nous avons d\u00e9velopp\u00e9 un mod\u00e8le dans le cinqui\u00e8me chapitre qui nous a permis une comparaison syst\u00e9matique d\u2019un seul NC \u00e0 la pile de photodiodes de divers mat\u00e9riaux semi-conducteurs (PbSe,<br \/>\nInAs, InSb, InP et CdSe). Plus pr\u00e9cis\u00e9ment, nous fournissons des abaques de propri\u00e9t\u00e9s optiques en fonction de param\u00e8tres qui peuvent \u00eatre modifi\u00e9s exp\u00e9rimentalement, tels que la longueur du ligand ou la taille du NC. Le dernier chapitre concerne le contr\u00f4le sp\u00e9cifique de la fonction de travail avec les ligands. Nous avons commenc\u00e9 \u00e0 d\u00e9velopper un mod\u00e8le qui, en termes, vise \u00e0 faciliter l\u2019ing\u00e9nierie de l\u2019alignement des bandes, am\u00e9liorant ainsi la performance des dispositifs.<\/p>\n<h5>Abstract:<\/h5>\n<div>Semiconducting layers made of colloidal nanocrystals (NCs) have shown great potential as active materials in infrared (IR) sensors, with promises to reduce fabrication costs and enhance optoelectronic properties. Although it is a relatively new technology, with the first monodisperse synthesis 30 years ago, huge advances including synthesis, surface engineering, deposition methods, device architecture, and fundamental physics have led to commercialization. However, to attain the full potential of NC IR sensors, improvements are still needed with a particular focus on the understanding and control of the material properties and their dependence on the environment.<\/div>\n<div><\/div>\n<div>In this context, we aim to combine experimental and theoretical tools to study the optoelectronic properties of isolated NCs until a layer of NCs integrated into electronic devices. In the first Chapter, we performed different PbS colloidal NC syntheses that allowed us to conduct numerous physicochemical investigations from the optical properties to the surface characterization. In the second Chapter, we studied the electronic structure of isolated PbS and HgTe NCs using advanced theoretical tools such as Empirical Tight-Binding Method (ETBM), Density Functional Theory (DFT), and Empirical Pseudopotential Method (EPM). We studied the effect of size and shape on the electronic structure and unveiled a 0D topological phase transition in HgTe NCs. The third Chapter focuses on the optical properties of PbS and HgTe NCs. Using ETBM and EPM, we related electronic structure to the essential features of an experimental absorption spectrum. In the fourth Chapter, we extend the previous results to a solid layer composed of densely packed NCs. However, the properties of a solid layer are different for an isolated NC, due to the interaction with the environment, especially the ligands. Therefore, on top of ETBM calculations we include Effective Medium Approximation (EMA), and in synergy with spectroscopic ellipsometry measurements, we investigated the effect of the surface chemistry, shape, and size of the optical properties of a NC layer. From the knowledge accumulated in the previous Chapters, we developed a model in the fifth Chapter that allowed us a systematic comparison from a single NC to the photodiode stack of various semiconductors materials (PbSe,<\/div>\n<div>InAs, InSb, InP, and CdSe). Specifically, we provide abacuses of optical properties according to parameters that can be engineered experimentally, such as the ligand length or NC size. The last Chapter concerns the specific control of the work function with ligands. We started to develop a model that in terms aims to facilitate band-alignment engineering enhancing the device performance.<\/div>\n<\/div><\/section>","protected":false},"excerpt":{"rendered":"","protected":false},"author":20,"featured_media":60214,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[87,65,84,187],"tags":[],"class_list":["post-60212","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-agenda-en","category-agenda","category-agenda-en-en","category-annonces-these"],"_links":{"self":[{"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/posts\/60212","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=60212"}],"version-history":[{"count":0,"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/posts\/60212\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/media\/60214"}],"wp:attachment":[{"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/media?parent=60212"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/categories?post=60212"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/tags?post=60212"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}