{"id":4018,"date":"2015-04-19T07:45:11","date_gmt":"2015-04-19T07:45:11","guid":{"rendered":"http:\/\/revoscience.com\/en\/?p=4018"},"modified":"2015-04-19T07:45:11","modified_gmt":"2015-04-19T07:45:11","slug":"sputtering-start-for-flat-materials","status":"publish","type":"post","link":"https:\/\/www.revoscience.com\/en\/sputtering-start-for-flat-materials\/","title":{"rendered":"Sputtering start for flat materials"},"content":{"rendered":"

A simple method for creating high-quality two-dimensional materials could enable industrial-scale production.<\/strong><\/em><\/p>\n

\n

\"Transistors<\/a>
Transistors made of films of two-dimensional molybdenum disulfide (MoS2) could be integrated with other silicon electronics devices. \u00a9 2015 A*STAR Institute of Materials Research and Engineering<\/figcaption><\/figure>\n

Two-dimensional materials have a whole host of exotic properties because they are just one atom thick. A*STAR researchers have now developed a method for creating large areas of atom-thin material for use in electronic devices.<\/span>

Graphene, a single layer of carbon atoms arranged into a honeycomb-like pattern, is the most famous example of a two-dimensional material. It is stronger than steel, has excellent electrical properties, and could be used to make two-dimensional devices that are much smaller than those currently made from bulk or thin-film silicon. However, it is not a semiconductor. And so scientists are turning to other materials that have this essential property for creating transistors.<\/span>

Shijie Wang from the A*STAR Institute of Materials Research and Engineering and his collaborators have now demonstrated a technique for creating a single atomic layer of molybdenum disulfide \u2014 a two-dimensional semiconductor.<\/span>

Molybdenum disulfide belongs to a family of materials called transition-metal dichalcogenides. They have two chalcogenide atoms (such as sulfur, selenium or tellurium) for every transition-metal atom (molybdenum and tungsten are examples). These materials and their wide range of electrical properties provide an excellent platform material system for versatile electronics. But creating high-quality material over areas large enough for industrial-scale production is difficult.<\/span>

\u201cTraditional mechanical exfoliation methods for obtaining two-dimensional materials have limited usefulness in commercial applications, and all previous chemical methods are incompatible for integration with device fabrication,\u201d says Wang. \u201cOur technique is a one-step process that can grow good-quality monolayer films, or few layers of molybdenum disulfide films, at wafer scale on various substrates using magnetron sputtering.\u201d<\/span>

The team fired a beam of argon ions at a molybdenum target in a vacuum chamber. This ejected molybdenum atoms from the surface where they reacted with a nearby sulfur vapor. These atoms then assembled onto a heated substrate of either sapphire or silicon. The team found that they could grow monolayer, bilayer, trilayer or thicker samples by altering the power of the argon-ion beam or the deposition time.<\/span>

They confirmed the quality of their material using a number of common characterization tools including Raman spectroscopy, atomic force microscopy, X-ray photoelectron spectroscopy and transmission electron microscopy. The researchers also demonstrated the excellent electrical properties of their molybdenum disulfide films by creating a working transistor.<\/span>

\u201cOur next step in this work will focus on the application of this technique to synthesize other two-dimensional materials and integrate them with different materials for various device applications,\u201d says Wang.<\/span>

The A*STAR-affiliated researchers contributing to this research are from the Institute of Materials Research and Engineering.<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"

A simple method for creating high-quality two-dimensional materials could enable industrial-scale production. Two-dimensional materials have a whole host of exotic properties because they are just one atom thick. A*STAR researchers have now developed a method for creating large areas of atom-thin material for use in electronic devices.Graphene, a single layer of carbon atoms arranged into […]<\/p>\n","protected":false},"author":6,"featured_media":4019,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[14],"tags":[],"class_list":["post-4018","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-innovation"],"featured_image_urls":{"full":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2015\/04\/2671.jpg",300,99,false],"thumbnail":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2015\/04\/2671-150x99.jpg",150,99,true],"medium":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2015\/04\/2671.jpg",300,99,false],"medium_large":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2015\/04\/2671.jpg",300,99,false],"large":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2015\/04\/2671.jpg",300,99,false],"1536x1536":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2015\/04\/2671.jpg",300,99,false],"2048x2048":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2015\/04\/2671.jpg",300,99,false],"ultp_layout_landscape_large":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2015\/04\/2671.jpg",300,99,false],"ultp_layout_landscape":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2015\/04\/2671.jpg",300,99,false],"ultp_layout_portrait":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2015\/04\/2671.jpg",300,99,false],"ultp_layout_square":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2015\/04\/2671.jpg",300,99,false],"newspaper-x-single-post":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2015\/04\/2671.jpg",300,99,false],"newspaper-x-recent-post-big":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2015\/04\/2671.jpg",300,99,false],"newspaper-x-recent-post-list-image":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2015\/04\/2671.jpg",95,31,false],"web-stories-poster-portrait":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2015\/04\/2671.jpg",300,99,false],"web-stories-publisher-logo":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2015\/04\/2671.jpg",96,32,false],"web-stories-thumbnail":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2015\/04\/2671.jpg",150,50,false]},"author_info":{"info":["Amrita Tuladhar"]},"category_info":"Innovation<\/a>","tag_info":"Innovation","comment_count":"0","_links":{"self":[{"href":"https:\/\/www.revoscience.com\/en\/wp-json\/wp\/v2\/posts\/4018","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.revoscience.com\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.revoscience.com\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.revoscience.com\/en\/wp-json\/wp\/v2\/users\/6"}],"replies":[{"embeddable":true,"href":"https:\/\/www.revoscience.com\/en\/wp-json\/wp\/v2\/comments?post=4018"}],"version-history":[{"count":0,"href":"https:\/\/www.revoscience.com\/en\/wp-json\/wp\/v2\/posts\/4018\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.revoscience.com\/en\/wp-json\/wp\/v2\/media\/4019"}],"wp:attachment":[{"href":"https:\/\/www.revoscience.com\/en\/wp-json\/wp\/v2\/media?parent=4018"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.revoscience.com\/en\/wp-json\/wp\/v2\/categories?post=4018"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.revoscience.com\/en\/wp-json\/wp\/v2\/tags?post=4018"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}