{"id":11713,"date":"2017-03-07T11:27:45","date_gmt":"2017-03-07T11:27:45","guid":{"rendered":"http:\/\/revoscience.com\/en\/?p=11713"},"modified":"2017-03-07T11:27:45","modified_gmt":"2017-03-07T11:27:45","slug":"coffee-ring-effect-leads-crystallization-control-semiconductors","status":"publish","type":"post","link":"https:\/\/www.revoscience.com\/en\/coffee-ring-effect-leads-crystallization-control-semiconductors\/","title":{"rendered":"Coffee-ring effect leads to crystallization control in semiconductors"},"content":{"rendered":"

KAUST researchers develop a method to control the orientation and properties of crystal regions within polycrystalline semiconductors<\/strong><\/em><\/span><\/p>\n

\"\"
Crystallization behavior can be controlled locally, creating regions with different crystal patterns. \u00a9 2017 KAUST<\/figcaption><\/figure>\n

A chance observation of crystals forming a mark that resembled the stain of a coffee cup left on a table has led to the growth of customized polycrystals with implications for faster and more versatile semiconductors.<\/span><\/p>\n

Thin-film semiconductors are the foundation of a vast array of electronic and optoelectronic devices. They are generally fabricated by crystallization processes that yield polycrystals with a chaotic mix of individual crystals of different orientations and sizes.<\/span><\/p>\n

Significant advances in controlling crystallization has been made by a team led by Professor Aram Amassian of Material Science and Engineering at King Abdullah University of Science and Technology (KAUST), Saudi Arabia. The group included individuals from the KAUST Solar Center and others from the University\u2019s Physical Science and Engineering Division in collaboration with Cornell University. Amassian said, \u201cThere is no longer a need to settle for random and incoherent crystallization.\u201d<\/span><\/p>\n

The team\u2019s recent discovery began when Dr. Liyang Yu of the KAUST team noticed that a droplet of liquid semiconductor material dried to form an outer coffee-ring shape that was much thicker than the material at the center. When he induced the material to crystallize, the outer ring crystallized first.<\/span><\/p>\n

\u201cThis hinted that local thickness matters for initiating crystallization,\u201d said Amassian, which went against the prevailing understanding of how polycrystal films form.<\/span><\/p>\n

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Seeding different patterns of crystallization at different locations enabled bespoke arrays of crystals that have commercial potential. \u00a9 2017 KAUST<\/figcaption><\/figure>\n

This anomaly led the researchers to delve deeper. They found that the thickness of the crystallizing film could be used to manipulate the crystallization of many materials (see top image). Most crucially, tinkering with the thickness also allowed fine control over the position and orientation of the crystals in different regions of a semiconductor [1].<\/span><\/p>\n

\u201cWe discovered how to achieve excellent semiconductor properties everywhere in a polycrystal film,\u201d said Amassian. He explained that seeding different patterns of crystallization at different locations also allowed the researchers to create bespoke arrays that can now be used in electronic circuits (see bottom image).<\/span><\/p>\n

This is a huge improvement to the conventional practice of making do with materials whose good properties are not sustained throughout the entire polycrystal nor whose functions at different regions can be controlled.<\/span><\/p>\n

\u201cWe can now make customized polycrystals on demand,\u201d Amassian said.<\/span><\/p>\n

Amassian hopes that this development will lead to high-quality, tailored polycrystal semiconductors to promote advances in optoelectronics, photovoltaics and printed electronic components. The method has the potential to bring more efficient consumer electronic devices, some with flexible and lightweight parts, new solar power generating systems and advances in medical electronics. And all thanks to the chance observation of an odd pattern in a semiconductor droplet.<\/span><\/p>\n

The team will now explore ways to move their work beyond the laboratory through industry partnerships and research collaborations.<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"

KAUST researchers develop a method to control the orientation and properties of crystal regions within polycrystalline semiconductors A chance observation of crystals forming a mark that resembled the stain of a coffee cup left on a table has led to the growth of customized polycrystals with implications for faster and more versatile semiconductors. Thin-film semiconductors […]<\/p>\n","protected":false},"author":6,"featured_media":11714,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[17],"tags":[],"class_list":["post-11713","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-research"],"featured_image_urls":{"full":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2017\/03\/4286.jpg",500,334,false],"thumbnail":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2017\/03\/4286-150x150.jpg",150,150,true],"medium":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2017\/03\/4286-300x200.jpg",300,200,true],"medium_large":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2017\/03\/4286.jpg",500,334,false],"large":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2017\/03\/4286.jpg",500,334,false],"1536x1536":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2017\/03\/4286.jpg",500,334,false],"2048x2048":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2017\/03\/4286.jpg",500,334,false],"ultp_layout_landscape_large":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2017\/03\/4286.jpg",500,334,false],"ultp_layout_landscape":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2017\/03\/4286.jpg",500,334,false],"ultp_layout_portrait":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2017\/03\/4286.jpg",500,334,false],"ultp_layout_square":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2017\/03\/4286.jpg",500,334,false],"newspaper-x-single-post":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2017\/03\/4286.jpg",500,334,false],"newspaper-x-recent-post-big":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2017\/03\/4286.jpg",500,334,false],"newspaper-x-recent-post-list-image":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2017\/03\/4286.jpg",95,63,false],"web-stories-poster-portrait":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2017\/03\/4286.jpg",500,334,false],"web-stories-publisher-logo":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2017\/03\/4286.jpg",96,64,false],"web-stories-thumbnail":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2017\/03\/4286.jpg",150,100,false]},"author_info":{"info":["Amrita Tuladhar"]},"category_info":"Research<\/a>","tag_info":"Research","comment_count":"0","_links":{"self":[{"href":"https:\/\/www.revoscience.com\/en\/wp-json\/wp\/v2\/posts\/11713","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=11713"}],"version-history":[{"count":0,"href":"https:\/\/www.revoscience.com\/en\/wp-json\/wp\/v2\/posts\/11713\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.revoscience.com\/en\/wp-json\/wp\/v2\/media\/11714"}],"wp:attachment":[{"href":"https:\/\/www.revoscience.com\/en\/wp-json\/wp\/v2\/media?parent=11713"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.revoscience.com\/en\/wp-json\/wp\/v2\/categories?post=11713"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.revoscience.com\/en\/wp-json\/wp\/v2\/tags?post=11713"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}