{"id":2541,"date":"2022-06-08T15:35:43","date_gmt":"2022-06-08T13:35:43","guid":{"rendered":"https:\/\/blog.rwth-aachen.de\/elektrotechnik\/?p=2541"},"modified":"2022-06-08T16:24:30","modified_gmt":"2022-06-08T14:24:30","slug":"neue-veroeffentlichung-von-professor-lemme-kolleginnen-und-kollegen","status":"publish","type":"post","link":"https:\/\/blog.rwth-aachen.de\/elektrotechnik\/en\/neue-veroeffentlichung-von-professor-lemme-kolleginnen-und-kollegen\/","title":{"rendered":"New Publication by Professor Lemme and Colleagues"},"content":{"rendered":"<div class=\"twoclick_social_bookmarks_post_2541 social_share_privacy clearfix 1.6.4 locale-en_US sprite-en_US\"><\/div><div class=\"twoclick-js\"><script type=\"text\/javascript\">\/* <![CDATA[ *\/\njQuery(document).ready(function($){if($('.twoclick_social_bookmarks_post_2541')){$('.twoclick_social_bookmarks_post_2541').socialSharePrivacy({\"services\":{\"facebook\":{\"status\":\"on\",\"txt_info\":\"2 Klicks f\\u00fcr mehr Datenschutz: Erst wenn Sie hier klicken, wird der Button aktiv und Sie k\\u00f6nnen Ihre Empfehlung an Facebook senden. Schon beim Aktivieren werden Daten an Dritte \\u00fcbertragen - siehe <em>i<\\\/em>.\",\"perma_option\":\"off\",\"action\":\"recommend\",\"language\":\"en_US\"}},\"txt_help\":\"Wenn Sie diese Felder durch einen Klick aktivieren, werden Informationen an Facebook, Twitter, Flattr, Xing, t3n, LinkedIn, Pinterest oder Google eventuell ins Ausland \\u00fcbertragen und unter Umst\\u00e4nden auch dort gespeichert. N\\u00e4heres erfahren Sie durch einen Klick auf das <em>i<\\\/em>.\",\"settings_perma\":\"Dauerhaft aktivieren und Daten\\u00fcber-tragung zustimmen:\",\"info_link\":\"http:\\\/\\\/www.heise.de\\\/ct\\\/artikel\\\/2-Klicks-fuer-mehr-Datenschutz-1333879.html\",\"uri\":\"https:\\\/\\\/blog.rwth-aachen.de\\\/elektrotechnik\\\/en\\\/neue-veroeffentlichung-von-professor-lemme-kolleginnen-und-kollegen\\\/\",\"post_id\":2541,\"post_title_referrer_track\":\"New+Publication+by+Professor+Lemme+and+Colleagues\",\"display_infobox\":\"on\"});}});\n\/* ]]> *\/<\/script><\/div><p><div id=\"attachment_2543\" style=\"width: 310px\" class=\"wp-caption alignright\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-2543\" class=\"wp-image-2543 size-medium\" src=\"https:\/\/blog.rwth-aachen.de\/elektrotechnik\/files\/2022\/06\/Portraet-von-Prof.-Lemme_Copyright-JRF-300x200.jpg\" alt=\"Portrait von Prof. Lemme\" width=\"300\" height=\"200\" srcset=\"https:\/\/blog.rwth-aachen.de\/elektrotechnik\/files\/2022\/06\/Portraet-von-Prof.-Lemme_Copyright-JRF-300x200.jpg 300w, https:\/\/blog.rwth-aachen.de\/elektrotechnik\/files\/2022\/06\/Portraet-von-Prof.-Lemme_Copyright-JRF-1024x683.jpg 1024w, https:\/\/blog.rwth-aachen.de\/elektrotechnik\/files\/2022\/06\/Portraet-von-Prof.-Lemme_Copyright-JRF-768x512.jpg 768w, https:\/\/blog.rwth-aachen.de\/elektrotechnik\/files\/2022\/06\/Portraet-von-Prof.-Lemme_Copyright-JRF.jpg 1500w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><p id=\"caption-attachment-2543\" class=\"wp-caption-text\">Portrait of Prof. Lemme (\u00a9 JRF)<\/p><\/div><\/p>\n<p><strong>Healing Achilles heel of two-dimensional transistors<\/strong><\/p>\n<p>Stability \u2013 in the sense of stable operation thorough lifetime \u2013 is one of the key characteristics that an electronic device need to present to be suitable for applications. And it is the Achilles heel of transistors based on two-dimensional materials, which typically show much worse stability than devices based on silicon. A team of researchers from TU Wien, AMO GmbH, RWTH Aachen University and Wuppertal University has now demonstrated a novel engineering approach to enhance the electrical stability of two-dimensional transistors by carefully tuning the Fermi energy. The results have been reported in Nature Electronics.<\/p>\n<p>Today, there is little doubt that devices based on graphene and other two-dimensional (2D) materials can exceed the state of the art for certain applications, thanks to their intrinsic properties. Two-dimensional materials are also seen as some of the most promising candidates for realizing ultimately scaled transistors at the end of the roadmap of silicon technology.\u00a0 However, devices based on 2D materials often show poor electrical stability, meaning that their behavior changes depending on their operation history.<\/p>\n<p>\u201cComponent reliability is one aspect that is often neglected in research. This is precisely where we have been working for several years, because it is of central importance for applications.&#8221; explains Professor Max Lemme, scientific director of AMO GmbH and Head of the Chair of Electronic Devices at RWTH. The instability is not only caused by 2D materials themselves, but mostly by charges trapped into the oxide-insulator used to fabricate the transistors. &#8220;Ideally, one would like to use a different insulator with fewer charge traps,&#8221; says Lemme, &#8220;but there are no scalable solutions for this yet. In our work, we have shown instead that it is possible to use a standard insulator such as aluminum oxide and to significantly suppress the adverse effects of the charge traps in the oxide, by adjusting the charge carrier density in the 2D material.&#8221;<\/p>\n<div id=\"attachment_2547\" style=\"width: 310px\" class=\"wp-caption alignleft\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-2547\" class=\"size-medium wp-image-2547\" src=\"https:\/\/blog.rwth-aachen.de\/elektrotechnik\/files\/2022\/06\/FOR_0111_digital_rgb-300x200.jpg\" alt=\"Mikrochip\" width=\"300\" height=\"200\" srcset=\"https:\/\/blog.rwth-aachen.de\/elektrotechnik\/files\/2022\/06\/FOR_0111_digital_rgb-300x200.jpg 300w, https:\/\/blog.rwth-aachen.de\/elektrotechnik\/files\/2022\/06\/FOR_0111_digital_rgb-1024x683.jpg 1024w, https:\/\/blog.rwth-aachen.de\/elektrotechnik\/files\/2022\/06\/FOR_0111_digital_rgb-768x512.jpg 768w, https:\/\/blog.rwth-aachen.de\/elektrotechnik\/files\/2022\/06\/FOR_0111_digital_rgb.jpg 1280w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><p id=\"caption-attachment-2547\" class=\"wp-caption-text\">\u00a9 Martin Braun<\/p><\/div>\n<p>The work combines a thorough theoretical analysis of the novel approach \u2013 dubbed by the authors \u2018stability-based design\u2019 \u2013 and a proof of principle demonstration of the concept, performed by measuring different types of graphene-based FETs. The key idea of the approach is to try to engineer the combination 2D-material\/insulator in such a way that the energy of the charge traps in the insulator is as different as possible from the one of the charge carriers in the 2D material. Lemme explains: \u201cGraphene based FETs were the ideal test bed for our approach, as it is relatively easy to tune the energy of charge carriers in graphene. The approach, however, is applicable to all FETs based on 2D semiconductors\u201d.\u00a0 These results represent a major step forward towards stable and reliable 2D materials transistors to be integrated in semiconductor technology.<\/p>\n<p>Bibliographic information:<br \/>\nT. Knobloch, B. Uzlu, Y. Yu. I.llarionov, Z. Wang, M. Otto, L. Filipovic, M. Waltl, D. Neumaier, M. C. Lemme, T. Grasser, <a href=\"https:\/\/www.nature.com\/articles\/s41928-022-00768-0\"><em>Improving stability in two-dimensional transistors with amorphous gate oxides by Fermi-level tuning<\/em><\/a><em>, Nature Electronics (2022) <\/em>\u2013 Open Access<em><br \/>\n<\/em>DOI: 10.1038\/s41928-022-00768-0<\/p>\n<p>&nbsp;<\/p>\n<p><strong>Contact:<\/strong><br \/>\nProf. Max C. Lemme<br \/>\nAMO GmbH<br \/>\nlemme@amo.de<\/p>","protected":false},"excerpt":{"rendered":"<p>Healing Achilles heel of two-dimensional transistors Stability \u2013 in the sense of stable operation thorough lifetime \u2013 is one of the key characteristics that an electronic device need to present [&hellip;]<\/p>\n","protected":false},"author":4047,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"c2c_always_allow_admin_comments":false,"footnotes":""},"categories":[1,7,8],"tags":[],"class_list":["post-2541","post","type-post","status-publish","format-standard","hentry","category-allgemein","category-energie-und-umwelt","category-information-kommunikation-und-elektronik"],"_links":{"self":[{"href":"https:\/\/blog.rwth-aachen.de\/elektrotechnik\/en\/wp-json\/wp\/v2\/posts\/2541","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/blog.rwth-aachen.de\/elektrotechnik\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blog.rwth-aachen.de\/elektrotechnik\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blog.rwth-aachen.de\/elektrotechnik\/en\/wp-json\/wp\/v2\/users\/4047"}],"replies":[{"embeddable":true,"href":"https:\/\/blog.rwth-aachen.de\/elektrotechnik\/en\/wp-json\/wp\/v2\/comments?post=2541"}],"version-history":[{"count":10,"href":"https:\/\/blog.rwth-aachen.de\/elektrotechnik\/en\/wp-json\/wp\/v2\/posts\/2541\/revisions"}],"predecessor-version":[{"id":2566,"href":"https:\/\/blog.rwth-aachen.de\/elektrotechnik\/en\/wp-json\/wp\/v2\/posts\/2541\/revisions\/2566"}],"wp:attachment":[{"href":"https:\/\/blog.rwth-aachen.de\/elektrotechnik\/en\/wp-json\/wp\/v2\/media?parent=2541"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blog.rwth-aachen.de\/elektrotechnik\/en\/wp-json\/wp\/v2\/categories?post=2541"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blog.rwth-aachen.de\/elektrotechnik\/en\/wp-json\/wp\/v2\/tags?post=2541"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}