{"id":414902,"date":"2020-02-04T11:55:37","date_gmt":"2020-02-04T16:55:37","guid":{"rendered":"http:\/\/www.rochester.edu\/newscenter\/?p=414902"},"modified":"2023-02-16T11:18:53","modified_gmt":"2023-02-16T16:18:53","slug":"lasers-etch-a-perfect-solar-energy-absorber-414902","status":"publish","type":"post","link":"https:\/\/www.rochester.edu\/newscenter\/lasers-etch-a-perfect-solar-energy-absorber-414902\/","title":{"rendered":"Lasers etch a \u2018perfect\u2019 solar energy absorber"},"content":{"rendered":"<p>The <a href=\"https:\/\/rochester.edu\/\">University of Rochester<\/a> research lab that recently used lasers to create <a href=\"https:\/\/www.rochester.edu\/newscenter\/superhydrophobic-metal-wont-sink-406272\/\">unsinkable metallic structures<\/a> has now demonstrated how the same technology could be used to create highly efficient solar power generators.<\/p>\n<p>In a <a href=\"https:\/\/www.nature.com\/articles\/s41377-020-0242-y\">paper in <em>Light: Science &amp; Applications<\/em><\/a>, the lab of <a href=\"http:\/\/www2.optics.rochester.edu\/workgroups\/guo\/about.html\">Chunlei Guo<\/a>, professor of <a href=\"\/\/www.hajim.rochester.edu\/optics\/\">optics<\/a> also affiliated with the <a href=\"\/\/www.pas.rochester.edu\/\">Department of Physics and Astronomy<\/a> and the <a href=\"https:\/\/www.hajim.rochester.edu\/matsci\/\">Material Sciences Program<\/a>, describes using powerful femto-second laser pulses to etch metal surfaces with nanoscale structures that selectively absorb light only at the solar wavelengths, but not elsewhere.<\/p>\n<p>A regular metal surface is shiny and highly reflective. Years ago, the Guo lab developed a black metal technology that turned shiny metals pitch black. \u201cBut to make a perfect solar absorber,\u201d Guo says, \u201cWe need more than a black metal and the result is this selective absorber.\u201d<\/p>\n<p>&nbsp;<\/p>\n<div class=\"embed-container\"><iframe loading=\"lazy\" src=\"https:\/\/www.youtube.com\/embed\/t2dSUwilqDE\" width=\"560\" height=\"315\" frameborder=\"0\" allowfullscreen=\"allowfullscreen\"><\/iframe><\/div>\n<p>&nbsp;<\/p>\n<p>This surface not only enhances the energy absorption from sunlight, but also reduces heat dissipation at other wavelengths, in effect, \u201cmaking a perfect metallic solar absorber for the first time,\u201d Guo says. \u201cWe also demonstrate solar energy harnessing with a thermal electric generator device.\u201d<\/p>\n<p>\u201cThis will be useful for any thermal solar energy absorber or harvesting device,\u201d particularly in \u00a0places with abundant sunlight, he adds.<\/p>\n<p>The work was funded by the Bill and Melinda Gates Foundation, the Army Research Office, and the National Science Foundation.<\/p>\n<p>The researchers experimented with aluminum, copper, steel, and tungsten, and found that tungsten, commonly used as a thermal solar absorber, had the highest solar absorption efficiency when treated with the new nanoscale structures. This improved the efficiency of thermal electrical generation by 130 percent compared to untreated tungsten.<\/p>\n<p>Coauthors include Sohail Jalil, Bo Lai, Mohamed Elkabbash, Jihua Zhang, Erik M. Garcell, and Subhash Singh of the Guo lab.<\/p>\n<h3><strong>A long line of research<\/strong><\/h3>\n<p>The lab has also used the femto-second laser etching technology to create <a href=\"https:\/\/www.rochester.edu\/newscenter\/superhydrophobic-metals-85592\/\">superhydrophobic<\/a> (water repellent) and <a href=\"http:\/\/www.rochester.edu\/news\/show.php?id=3387\">superhydrophilic<\/a> (water-attracting) metals. In November 2019, for example, Guo\u2019s lab reported creating <a href=\"https:\/\/www.rochester.edu\/newscenter\/superhydrophobic-metal-wont-sink-406272\/\">metallic structures that do not sink<\/a> no matter how often they are forced into water or how much it is damaged or punctured.<\/p>\n<p>This new paper, however, expands upon the lab\u2019s initial work with femto-second laser etched black metal.<\/p>\n<p>Prior to creating the water attracting and repellent metals, \u00a0Guo and his assistant, Anatoliy Vorobyev, demonstrated the use of femto-second laser pulses <a href=\"https:\/\/www.rochester.edu\/news\/show.php?id=2701\">to turn almost any metal pitch blac<\/a>k. The surface structures created on the metal were incredibly effective at capturing incoming radiation, such as light. But they captured light over a broad range of wavelengths.<\/p>\n<p>Subsequently, his team used a similar process to <a href=\"https:\/\/www.rochester.edu\/news\/show.php?id=3106\">change the color of a range of metals to various colors, such as blue, golden, and gray<\/a>, in addition to the black already achieved. The applications could include making color filters and optical spectral devices, a car factory using a single laser to produce cars of different colors; etching a full-color photograph of a family into the refrigerator door; or proposing with a gold engagement ring that matches the color of your fiancee&#8217;s blue eyes.<\/p>\n<p>The lab also used the initial black and colored metal technique to create a unique array of nano- and micro-scale structures <a href=\"https:\/\/www.rochester.edu\/pr\/Review\/V71N6\/inreview08.html\">on the surface of a regular tungsten filament<\/a>, enabling a light bulb to glow more brightly at the same energy usage.<\/p>\n<p>\u201cWe fired the laser beam right through the glass of the bulb and altered a patch on the filament. When we lit the bulb, we could actually see this one patch was clearly brighter than the rest of the filament,\u201d Guo said.<\/p>\n<hr \/>\n<h3><strong>Read more<\/strong><\/h3>\n<div class=\"large-up-3\">\n<div class=\"column\" style=\"padding-left: 0px;\"><a href=\"https:\/\/www.rochester.edu\/newscenter\/superhydrophobic-metal-wont-sink-406272\/\"><img decoding=\"async\" style=\"margin-bottom: 10px; height: 200px;\" src=\"https:\/\/www.rochester.edu\/newscenter\/wp-content\/uploads\/2019\/11\/fea-superhydrophobic-metal-unsinkable.jpg\" alt=\"Metal disc submerged in a beaker of water, rising back to the surface.\" \/><br \/>\n<strong>Spiders and ants inspire metal that won\u2019t sink<\/strong><\/a><\/p>\n<p><span style=\"font-size: .9em;\">Rochester researchers have created a metallic structure so water repellent, it refuses to sink\u2014no matter how often it is forced into water.<\/span><\/div>\n<div class=\"column\" style=\"padding-right: 0px;\"><a href=\"https:\/\/www.rochester.edu\/newscenter\/superhydrophobic-metals-85592\/\"><img decoding=\"async\" style=\"margin-bottom: 10px;\" src=\"https:\/\/www.rochester.edu\/newscenter\/wp-content\/uploads\/2015\/01\/2013-12-19_chunlei_drops_042.jpg\" alt=\"drop of water about to drop off the edge of a metal surface.\" height=\"600\" \/><br \/>\n<strong>Laser-generated surface structures create extremely water-repellent metals<\/strong><\/a><\/p>\n<p><span style=\"font-size: .9em;\">Scientists at the Institute of Optics have used lasers to transform metals into extremely water repellent, or super-hydrophobic, materials without the need for temporary coatings.<\/span><\/div>\n<div class=\"column\" style=\"padding-right: 0px;\"><a href=\"https:\/\/www.rochester.edu\/newscenter\/metal-perovskite-solar-cells-vs-silicon-efficiency-550212\/\"><img decoding=\"async\" style=\"margin-bottom: 10px;\" src=\"https:\/\/www.rochester.edu\/newscenter\/wp-content\/uploads\/2023\/02\/fea-perovskites.jpg\" alt=\"Close-up of a perovskite crystalline stone against a white background. Perovskites show great potential as light absorbing material.\" height=\"600\" \/><br \/>\n<strong>Perovskites, a \u2018dirt cheap\u2019 alternative to silicon, just got a lot more efficient<\/strong><\/a><\/p>\n<p><span style=\"font-size: .9em;\">The secret, a University of Rochester optics professor explains, is to harness the power of metals. <\/span><\/div>\n<\/div>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>The University of Rochester research lab that recently used lasers to create unsinkable metal structures has now demonstrated how the same technology could be used to create highly efficient solar power generators.<\/p>\n","protected":false},"author":286,"featured_media":415272,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[116],"tags":[18662,18632,18652,37312,18572,16072],"class_list":["post-414902","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-sci-tech","tag-department-of-physics-and-astronomy","tag-hajim-school-of-engineering-and-applied-sciences","tag-institute-of-optics","tag-materials-science-program","tag-research-finding","tag-school-of-arts-and-sciences"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Lasers etch a \u2018perfect\u2019 solar energy absorber<\/title>\n<meta name=\"description\" content=\"The same technology Rochester researchers used to create unsinkable metal structures can also be used to create highly efficient solar power generators.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.rochester.edu\/newscenter\/lasers-etch-a-perfect-solar-energy-absorber-414902\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Lasers etch a \u2018perfect\u2019 solar energy absorber\" \/>\n<meta property=\"og:description\" content=\"The same technology Rochester researchers used to create unsinkable metal structures can also be used to create highly efficient solar power generators.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.rochester.edu\/newscenter\/lasers-etch-a-perfect-solar-energy-absorber-414902\/\" \/>\n<meta property=\"og:site_name\" content=\"News Center\" \/>\n<meta property=\"article:published_time\" content=\"2020-02-04T16:55:37+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2023-02-16T16:18:53+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.rochester.edu\/newscenter\/wp-content\/uploads\/2020\/02\/fea-solar-energy-absorber.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1000\" \/>\n\t<meta property=\"og:image:height\" content=\"600\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"Bob Marcotte\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Bob Marcotte\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"4 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/www.rochester.edu\\\/newscenter\\\/lasers-etch-a-perfect-solar-energy-absorber-414902\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.rochester.edu\\\/newscenter\\\/lasers-etch-a-perfect-solar-energy-absorber-414902\\\/\"},\"author\":{\"name\":\"Bob Marcotte\",\"@id\":\"https:\\\/\\\/www.rochester.edu\\\/newscenter\\\/#\\\/schema\\\/person\\\/e0d8d271cd290d592461fa9cefca013b\"},\"headline\":\"Lasers etch a \u2018perfect\u2019 solar energy absorber\",\"datePublished\":\"2020-02-04T16:55:37+00:00\",\"dateModified\":\"2023-02-16T16:18:53+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/www.rochester.edu\\\/newscenter\\\/lasers-etch-a-perfect-solar-energy-absorber-414902\\\/\"},\"wordCount\":690,\"image\":{\"@id\":\"https:\\\/\\\/www.rochester.edu\\\/newscenter\\\/lasers-etch-a-perfect-solar-energy-absorber-414902\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/www.rochester.edu\\\/newscenter\\\/wp-content\\\/uploads\\\/2020\\\/02\\\/fea-solar-energy-absorber.jpg\",\"keywords\":[\"Department of Physics and Astronomy\",\"Hajim School of Engineering and Applied Sciences\",\"Institute of Optics\",\"Materials Science Program\",\"research finding\",\"School of Arts and Sciences\"],\"articleSection\":[\"Science &amp; 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