{"id":2141,"date":"2015-10-01T02:14:15","date_gmt":"2015-10-01T02:14:15","guid":{"rendered":"http:\/\/www.kurzweilai.net\/?p=263049"},"modified":"2015-10-01T08:15:41","modified_gmt":"2015-10-01T08:15:41","slug":"a-promising-new-2-d-semiconductor-material","status":"publish","type":"post","link":"https:\/\/hoo.central12.com\/fugic\/2015\/10\/01\/a-promising-new-2-d-semiconductor-material\/","title":{"rendered":"A promising new 2-D semiconductor material"},"content":{"rendered":"
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Ultrathin sheets of a new 2-D hybrid perovskite are square-shaped and relatively large in area, properties that should facilitate their integration into future electronic devices (credit: Peidong Yang, Berkeley Lab)<\/p><\/div>\n

<\/strong>The first atomically thin 2D sheets of organic-inorganic hybrid perovskites<\/a> have been created by Lawrence Berkeley National Laboratory (Berkeley Lab)<\/a> researchers, adding to the growing list of two-dimensional semiconductors, such as graphene<\/a>, boron nitride<\/a>, and molybdenum disulfide<\/a>, whose unique electronic properties make them potential successors to silicon in future devices.<\/p>\n

However, unlike the other contenders, which are covalent semiconductors, these 2D hybrid perovskites are ionic materials, which gives them special properties of their own.<\/p>\n

Traditional perovskites are typically metal-oxide materials that display a wide range of electromagnetic properties, including ferroelectricity and piezoelectricity, superconductivity and colossal magnetoresistance. As KurzweilAI<\/em> has reported, perovskites have been solution-processed recently into thin films or bulk crystals for photovoltaic devices<\/a>, reaching 20-percent power conversion efficiency; and have been used to create lower-cost, high-brightness LEDs<\/a>.<\/p>\n

2D atomically thin nanostructures<\/strong><\/p>\n

The new ultrathin sheets are of high quality, large in area, and square-shaped. They also exhibited efficient photoluminescence, color-tunability, and a unique structural relaxation not found in covalent semiconductor sheets.<\/p>\n

\u201cWe believe this is the first example of 2D atomically thin nanostructures made from ionic materials,\u201d says Peidong Yang<\/a>, a chemist with Berkeley Lab\u2019s Materials Sciences Division and world authority on nanostructures, who first came up with the idea for this research some 20 years ago.<\/p>\n

\u201cThe results of our study open up opportunities for fundamental research on the synthesis and characterization of atomically thin 2D hybrid perovskites and introduce a new family of 2D solution-processed semiconductors for nanoscale optoelectronic devices, such as\u00a0field effect transistors and photodetectors.\u201d<\/p>\n

Yang, who also holds appointments with the University of California (UC) Berkeley<\/a> and is a co-director of the Kavli Energy NanoScience Institute (Kavli-ENSI)<\/a>, is the corresponding author of a paper describing this research in the journal Science.\u00a0<\/em><\/p>\n

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Structural illustration of a single layer of a 2D hybrid perovskite (C4H9NH3)2PbBr4), an ionic material with different properties than 2D covalent semiconductors (credit: Peidong Yang, Berkeley Lab)<\/p><\/div>\n

 <\/p>\n

\n

Abstract of\u00a0Atomically thin two-dimensional organic-inorganic hybrid perovskites<\/em><\/strong><\/p>\n

Organic-inorganic hybrid perovskites, which have proved to be promising semiconductor materials for photovoltaic applications, have been made into atomically thin two-dimensional (2D) sheets. We report the solution-phase growth of single- and few-unit-cell-thick single-crystalline 2D hybrid perovskites of (C4<\/sub>H9<\/sub>NH3<\/sub>)2<\/sub>PbBr4<\/sub>\u00a0with well-defined square shape and large size. In contrast to other 2D materials, the hybrid perovskite sheets exhibit an unusual structural relaxation, and this structural change leads to a band gap shift as compared to the bulk crystal. The high-quality 2D crystals exhibit efficient photoluminescence, and color tuning could be achieved by changing sheet thickness as well as composition via the synthesis of related materials.<\/p>\n","protected":false},"excerpt":{"rendered":"

The first atomically thin 2D sheets of organic-inorganic hybrid perovskites have been created by Lawrence Berkeley National Laboratory (Berkeley Lab) researchers, adding to the growing list of two-dimensional semiconductors, such as graphene, boron nitride, and molybdenum disulfide, whose unique electronic properties make them potential successors to silicon in future devices. However, unlike the other contenders, […]<\/p>\n","protected":false},"author":13,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[48,43],"tags":[],"class_list":["post-2141","post","type-post","status-publish","format-standard","hentry","category-electronics","category-news"],"_links":{"self":[{"href":"https:\/\/hoo.central12.com\/fugic\/wp-json\/wp\/v2\/posts\/2141"}],"collection":[{"href":"https:\/\/hoo.central12.com\/fugic\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/hoo.central12.com\/fugic\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/hoo.central12.com\/fugic\/wp-json\/wp\/v2\/users\/13"}],"replies":[{"embeddable":true,"href":"https:\/\/hoo.central12.com\/fugic\/wp-json\/wp\/v2\/comments?post=2141"}],"version-history":[{"count":1,"href":"https:\/\/hoo.central12.com\/fugic\/wp-json\/wp\/v2\/posts\/2141\/revisions"}],"predecessor-version":[{"id":2142,"href":"https:\/\/hoo.central12.com\/fugic\/wp-json\/wp\/v2\/posts\/2141\/revisions\/2142"}],"wp:attachment":[{"href":"https:\/\/hoo.central12.com\/fugic\/wp-json\/wp\/v2\/media?parent=2141"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/hoo.central12.com\/fugic\/wp-json\/wp\/v2\/categories?post=2141"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/hoo.central12.com\/fugic\/wp-json\/wp\/v2\/tags?post=2141"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}