{"id":71491,"date":"2013-04-08T00:00:00","date_gmt":"2013-04-07T22:00:00","guid":{"rendered":"http:\/\/b.bati-journal.com\/vers-des-rendements-photovoltaiques-de-33-avec-les-nanofils\/71491"},"modified":"2019-07-15T12:22:20","modified_gmt":"2019-07-15T10:22:20","slug":"vers-des-rendements-photovoltaiques-de-33-avec-les-nanofils","status":"publish","type":"post","link":"https:\/\/batijournal.com\/index.php\/vers-des-rendements-photovoltaiques-de-33-avec-les-nanofils\/71491\/","title":{"rendered":"Vers des rendements photovolta\u00efques de 33% avec les nanofils"},"content":{"rendered":"

De r\u00e9centes d\u00e9couvertes des chercheurs de l’EPFL (Lausanne), sur de petits filaments appel\u00e9s \u00abnanofils\u00bb laissent entrevoir la fabrication de panneaux solaires captant 12 fois plus de lumi\u00e8re mais n\u00e9cessitant 10 000 fois moins de mati\u00e8re. Malgr\u00e9 leur taille minuscule, les nanofils rec\u00e8lent un incroyable potentiel de production d’\u00e9nergie.\u00a0\u00abIls captent beaucoup plus de lumi\u00e8re que pr\u00e9vu\u00bb<\/i>, explique Anna Fontcuberta i Morral, qui vient de publier sa d\u00e9couverte dans Nature Photonics. Les nanofils sont de tr\u00e8s petits filaments, capables dans ce cas d’absorber la lumi\u00e8re. Leur diam\u00e8tre est de l’ordre du millioni\u00e8me de millim\u00e8tre (20 \u00e0 100 nanom\u00e8tres), soit jusqu’\u00e0 1 000 fois plus fins qu’un cheveu humain, ou comparable \u00e0 celui d’un virus. Dot\u00e9 des propri\u00e9t\u00e9s \u00e9lectroniques ad\u00e9quates, le nanofil devient une mini-cellule solaire qui transforme la lumi\u00e8re en courant \u00e9lectrique. Anna Fontcuberta i Morral et son \u00e9quipe ont d\u00e9velopp\u00e9 une cellule solaire \u00e0 nanofils utilisant l’ars\u00e9niure de gallium, un mat\u00e9riau sensiblement plus efficace que le traditionnel silicium. Ils ont d\u00e9couvert que cette cellule \u00e0 nanofils a l’\u00e9tonnante propri\u00e9t\u00e9 d’absorber jusqu’\u00e0 12 fois plus de lumi\u00e8re qu’une cellule conventionnelle. Or davantage de lumi\u00e8re, c’est davantage d’\u00e9nergie. Dispos\u00e9 sur un plan vertical, le nanofil agit comme une sorte d’entonnoir \u00e0 lumi\u00e8re: malgr\u00e9 un diam\u00e8tre infime, de quelques centaines de nanom\u00e8tres, il absorbe les rayons du jour comme s’il \u00e9tat 12 fois plus gros. Les performances mesur\u00e9es du prototype d’Anna Fontcuberta sont d’ores et d\u00e9j\u00e0 10% plus \u00e9lev\u00e9es que le seuil th\u00e9orique des panneaux solaires conventionnels \u00e0 mat\u00e9riau unique. Le rendement pourrait \u00eatre encore am\u00e9lior\u00e9 par une optimisation des dimensions des nanofils, de la qualit\u00e9 de l’ars\u00e9niure de gallium et des contacts \u00e9lectriques. Les dispositifs photovolta\u00efques \u00e0 nanofils ouvrent de nouvelles perspectives pour la production d’\u00e9nergie. En pratique, un r\u00e9seau de nanofils pourrait atteindre un rendement effectif de 33%, contre un maximum de 20% pour les panneaux conventionnels actuellement sur le march\u00e9.\u000b\u000bwww.epfl.ch<\/span><\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

De r\u00e9centes d\u00e9couvertes des chercheurs de l’EPFL (Lausanne), sur de petits filaments appel\u00e9s \u00abnanofils\u00bb laissent entrevoir la fabrication de panneaux solaires captant 12 fois plus de lumi\u00e8re mais n\u00e9cessitant 10 000 fois moins de mati\u00e8re. Malgr\u00e9 leur taille minuscule, les nanofils rec\u00e8lent un incroyable potentiel de production d’\u00e9nergie.\u00a0\u00abIls captent beaucoup plus de lumi\u00e8re que pr\u00e9vu\u00bb, […]<\/p>\n","protected":false},"author":1,"featured_media":71492,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_et_pb_use_builder":"","_et_pb_old_content":"","_et_gb_content_width":"","footnotes":""},"categories":[6351],"tags":[464],"class_list":["post-71491","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-energie-environnement","tag-photovoltaique"],"yoast_head":"\nVers des rendements photovolta\u00efques de 33% avec les nanofils<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/batijournal.com\/index.php\/vers-des-rendements-photovoltaiques-de-33-avec-les-nanofils\/71491\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Vers des rendements photovolta\u00efques de 33% avec les nanofils\" \/>\n<meta property=\"og:description\" content=\"De r\u00e9centes d\u00e9couvertes des chercheurs de l’EPFL (Lausanne), sur de petits filaments appel\u00e9s \u00abnanofils\u00bb laissent entrevoir la fabrication de panneaux solaires captant 12 fois plus de lumi\u00e8re mais n\u00e9cessitant 10 000 fois moins de mati\u00e8re. Malgr\u00e9 leur taille minuscule, les nanofils rec\u00e8lent un incroyable potentiel de production d’\u00e9nergie.\u00a0\u00abIls captent beaucoup plus de lumi\u00e8re que pr\u00e9vu\u00bb, […]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/batijournal.com\/index.php\/vers-des-rendements-photovoltaiques-de-33-avec-les-nanofils\/71491\/\" \/>\n<meta property=\"og:site_name\" content=\"Batijournal\" \/>\n<meta property=\"article:published_time\" content=\"2013-04-07T22:00:00+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2019-07-15T10:22:20+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/batijournal.com\/wp-content\/uploads\/2015\/03\/61449296.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"599\" \/>\n\t<meta property=\"og:image:height\" content=\"330\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"Bati-journal\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta 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