{"id":73682,"date":"2025-05-22T15:03:37","date_gmt":"2025-05-22T13:03:37","guid":{"rendered":"https:\/\/www.iemn.fr\/?p=73682"},"modified":"2025-05-22T15:06:51","modified_gmt":"2025-05-22T13:06:51","slug":"quantitative-analysis-of-molecular-conductance-in-the-tunneling-regime","status":"publish","type":"post","link":"https:\/\/www.iemn.fr\/en\/a-la-une\/quantitative-analysis-of-molecular-conductance-in-the-tunneling-regime.html","title":{"rendered":"S\u00e9minaire : C. Daniel Frisbie &lsquo;Quantitative Analysis of Molecular Conductance in the Tunneling Regime&rsquo; &#8211; 23 mai"},"content":{"rendered":"<div  class='flex_column av-vq9ow6-4ea65ffd1d4e0be7a5230f1077847b71 av_one_full  avia-builder-el-0  avia-builder-el-no-sibling  first flex_column_div'     ><section  class='av_textblock_section av-mazchq0s-aa5f04d93e6c3bb80342cae114145ef6'   itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/BlogPosting\" itemprop=\"blogPost\" ><div class='avia_textblock'  itemprop=\"text\" ><h4>Quantitative Analysis of Molecular Conductance in the Tunneling Regime<\/h4>\n<p><strong><span style=\"color: #800000;\">\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-13ewzjw-10-2ccad9ba8c63aebd0958467334f1a6d9\">\n.av_font_icon.av-13ewzjw-10-2ccad9ba8c63aebd0958467334f1a6d9{\ncolor:#f16728;\nborder-color:#f16728;\n}\n.av_font_icon.av-13ewzjw-10-2ccad9ba8c63aebd0958467334f1a6d9 .av-icon-char{\nfont-size:20px;\nline-height:20px;\n}\n<\/style>\n<span  class='av_font_icon av-13ewzjw-10-2ccad9ba8c63aebd0958467334f1a6d9 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='\ue885' data-av_iconfont='entypo-fontello' ><\/span><\/span><\/span><span style=\"color: #f16728;\">Par C. Daniel Frisbie &#8211; <\/span><\/strong>(Distinguished McKnight University Professor,\u00a0Chemical Engineering &amp; Materials Science,\u00a0University of Minnesota<\/p>\n<p style=\"text-align: center;\"><a href=\"https:\/\/frisbie.cems.umn.edu\" target=\"_blank\" rel=\"noopener\"><strong><span style=\"color: #800000;\">\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-13ewzjw-10-1-b4a54ade627b32af46f36cd660d59f3b\">\n.av_font_icon.av-13ewzjw-10-1-b4a54ade627b32af46f36cd660d59f3b{\ncolor:#f16728;\nborder-color:#f16728;\n}\n.av_font_icon.av-13ewzjw-10-1-b4a54ade627b32af46f36cd660d59f3b .av-icon-char{\nfont-size:20px;\nline-height:20px;\n}\n<\/style>\n<span  class='av_font_icon av-13ewzjw-10-1-b4a54ade627b32af46f36cd660d59f3b avia_animate_when_visible av-icon-style- avia-icon-pos-center avia-icon-animate'><span class='av-icon-char' aria-hidden='true' data-av_icon='\ue803' data-av_iconfont='entypo-fontello' ><\/span><\/span> See more<\/span><\/strong><\/a><\/p>\n<hr \/>\n<p><strong><span style=\"color: #800000;\">\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-13ewzjw-10-2-1322fb3547e3b74b5da047468cfbdfd2\">\n.av_font_icon.av-13ewzjw-10-2-1322fb3547e3b74b5da047468cfbdfd2{\ncolor:#f16728;\nborder-color:#f16728;\n}\n.av_font_icon.av-13ewzjw-10-2-1322fb3547e3b74b5da047468cfbdfd2 .av-icon-char{\nfont-size:20px;\nline-height:20px;\n}\n<\/style>\n<span  class='av_font_icon av-13ewzjw-10-2-1322fb3547e3b74b5da047468cfbdfd2 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='\ue842' data-av_iconfont='entypo-fontello' ><\/span><\/span>Friday, May 23 at 10h30 a.m., IEMN amphitheater<\/span><\/strong><\/p>\n<p><strong><span style=\"color: #800000;\">\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-13ewzjw-10-2-1-eb796ac4d55a0216ab3601fd1256342c\">\n.av_font_icon.av-13ewzjw-10-2-1-eb796ac4d55a0216ab3601fd1256342c{\ncolor:#f16728;\nborder-color:#f16728;\n}\n.av_font_icon.av-13ewzjw-10-2-1-eb796ac4d55a0216ab3601fd1256342c .av-icon-char{\nfont-size:20px;\nline-height:20px;\n}\n<\/style>\n<span  class='av_font_icon av-13ewzjw-10-2-1-eb796ac4d55a0216ab3601fd1256342c 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='\ue84e' data-av_iconfont='entypo-fontello' ><\/span><\/span><\/span><span style=\"color: #f16728;\">Abstract:<\/span><\/strong> This talk will describe measurements and quantitative analysis of tunneling conductance through molecules connected between metal electrodes. Experiments employ conducting probe atomic force microscopy (CP-AFM) to make electrical contacts to self-assembled monolayers (SAMs) on various\u00a0metals. Quantitative analysis of the junction current-voltage (I-V) characteristics is greatly aided by an analytical model that allows extraction of the molecular orbital (e.g., HOMO or LUMO) offset from the Fermi level,\u00a0\u03b5, and the metal-orbital coupling,\u00a0\u0393. These two parameters and a voltage shift factor\u00a0\u03b3\u00a0define the junction density of states and the basic tunneling transmission function. We show that the single level model applies extremely well to common molecular junctions in which the mechanism is single step tunneling. Using this analytical formalism and the CP-AFM platform, we address a\u00a0number of different conductance problems in molecular electronics including: (i) the impact of molecular structure and metal work function; (ii) the identification of the orbital facilitating conduction; (iii) the role of metal-orbital coupling; (iv) Fermi and HOMO level pinning; (v) the causes of current\u00a0rectification; (vi) the effects of image potentials; (vii) the general applicability and limits of the single level model; (viii) accurate\u00a0I-V\u00a0simulations and universal behavior; (ix) mixed molecular junctions and the role of intermolecular interactions; (x) the causes of recently discovered conductance-proton\u00a0chemical shift correlations. The talk will focus on a subset of these issues. The overall aim of this work is to enhance fundamental understanding of molecular conductance and simultaneously to elevate molecular electronics as a quantitative sub-discipline in chemistry, physics, and materials science.<\/p>\n<\/div><\/section><\/div>","protected":false},"excerpt":{"rendered":"","protected":false},"author":2,"featured_media":69379,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3],"tags":[],"class_list":["post-73682","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-a-la-une"],"_links":{"self":[{"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/posts\/73682","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=73682"}],"version-history":[{"count":5,"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/posts\/73682\/revisions"}],"predecessor-version":[{"id":73684,"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/posts\/73682\/revisions\/73684"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/media\/69379"}],"wp:attachment":[{"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/media?parent=73682"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/categories?post=73682"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/tags?post=73682"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}