{"id":10661,"date":"2022-05-11T13:44:19","date_gmt":"2022-05-11T11:44:19","guid":{"rendered":"https:\/\/ggba.swiss\/lepfl-valais-solutionne-le-deploiement-a-grande-echelles-des-cellules-solaires-en-perovskite\/"},"modified":"2023-07-04T13:43:56","modified_gmt":"2023-07-04T11:43:56","slug":"lepfl-valais-solutionne-le-deploiement-a-grande-echelles-des-cellules-solaires-en-perovskite","status":"publish","type":"post","link":"https:\/\/ggba.swiss\/fr\/lepfl-valais-solutionne-le-deploiement-a-grande-echelles-des-cellules-solaires-en-perovskite\/","title":{"rendered":"L&rsquo;EPFL Valais solutionne le d\u00e9ploiement \u00e0 grande \u00e9chelle des cellules solaires en p\u00e9rovskite"},"content":{"rendered":"\n<p>Des scientifiques de l&rsquo;<a href=\"https:\/\/www.epfl.ch\/about\/campus\/fr\/valais-fr\/\" target=\"_blank\" rel=\"noopener\">EPFL Valais Wallis<\/a> ont trouv\u00e9 un moyen de surmonter les probl\u00e8mes de d\u00e9ploiement \u00e0 grande \u00e9chelle des p\u00e9rovskites.\u00a0 Ils ont mis au point une m\u00e9thode solvothermique simple permettant de produire des nanoparticules rhombo\u00e9driques de dioxyde de titane monocristallin qui peuvent \u00eatre utilis\u00e9es pour cr\u00e9er un film de p\u00e9rovskite.<\/p>\n<p>Les p\u00e9rovskites sont des mat\u00e9riaux hybrides \u00e0 base d\u2019halog\u00e9nures m\u00e9talliques et de compos\u00e9s organiques. Elles int\u00e9ressent beaucoup le domaine de l\u2019\u00e9nergie solaire en raison de leurs capacit\u00e9s en tant que collecteurs de lumi\u00e8re associ\u00e9es \u00e0 un faible co\u00fbt de fabrication, ce qui fait d\u2019elles les principaux candidats pour supplanter leurs homologues en silicium sur le march\u00e9. Les p\u00e9rovskites offrent un vaste potentiel dans de multiples applications dont les \u00e9clairages \u00e0 LED, les lasers et les photod\u00e9tecteurs.<\/p>\n<p>L\u2019un des obstacles \u00e0 la commercialisation des cellules photovolta\u00efques \u00e0 p\u00e9rovskites est la diminution de leur rendement de conversion de puissance et de leur stabilit\u00e9 op\u00e9rationnelle lorsqu\u2019elles sont d\u00e9ploy\u00e9es \u00e0 grande \u00e9chelle. Cela s\u2019explique par les d\u00e9fauts naturels de la structure mol\u00e9culaire de la p\u00e9rovskite, qui interf\u00e8rent avec le flux d\u2019\u00e9lectrons. \u00a0Il s\u2019ensuit une \u00abperte r\u00e9sistive\u00bb, c\u2019est-\u00e0-dire une perte de puissance due \u00e0 la r\u00e9sistance. Par ailleurs, les processus n\u00e9cessaires pour obtenir des films de p\u00e9rovskite de haute qualit\u00e9 et de grande surface sont assez complexes.<\/p>\n<p>La nouvelle structure d\u00e9velopp\u00e9e par les scientifiques de l\u2019EPFL Valais Vallis pr\u00e9sente une quantit\u00e9 moindre de d\u00e9saccords de r\u00e9seau, faisant r\u00e9f\u00e9rence \u00e0 la structure en \u00e9chelle des nanoparticules de dioxyde de titane. Cela se traduit par un nombre plus faible de d\u00e9fauts, ce qui garantit un meilleur flux d\u2019\u00e9lectrons tout au long du processus et une perte de puissance moindre.<\/p>\n<h4>Des modules \u00e0 haut rendement avec un minimum de pertes lors de d\u00e9ploiement \u00e0 grande \u00e9chelle<\/h4>\n<p>Apr\u00e8s avoir test\u00e9 les nouvelles petites cellules photovolta\u00efques \u00e0 base de nanoparticules, les scientifiques ont obtenu un rendement de conversion de puissance de 24,05% et un facteur de remplissage (une mesure de la puissance r\u00e9elle disponible) de 84,7%. Les cellules conservent \u00e9galement environ 90% de leurs performances initiales apr\u00e8s un fonctionnement continu de 1\u2019400 heures.<\/p>\n<p>Les scientifiques ont \u00e9galement fabriqu\u00e9 des cellules de grande surface, qui ont atteint une efficacit\u00e9 de 22,72 % pour une surface active de pr\u00e8s de 24 cm2, ce qui en fait les modules les plus efficaces avec la plus faible perte d&rsquo;efficacit\u00e9 lors d\u2019un d\u00e9ploiement \u00e0 grande \u00e9chelle.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Des scientifiques de l&rsquo;EPFL Valais Wallis ont trouv\u00e9 un moyen de surmonter la perte de puissance et la complexit\u00e9 de fabrication que repr\u00e9sente le d\u00e9ploiement \u00e0 grande \u00e9chelle des cellules solaires en p\u00e9rovskite.<\/p>\n","protected":false},"author":3,"featured_media":10662,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"inline_featured_image":false,"mc4wp_mailchimp_campaign":[],"footnotes":""},"categories":[844],"tags":[1039,1078,1081],"class_list":["post-10661","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-cleantech","tag-energy-fr","tag-solar-energy-fr","tag-sustainability-fr"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.2 - 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