{"id":41997,"date":"2025-09-25T09:30:36","date_gmt":"2025-09-25T07:30:36","guid":{"rendered":"https:\/\/www.uni.lu\/fstm-en\/?post_type=news&#038;p=41997"},"modified":"2025-09-25T10:00:03","modified_gmt":"2025-09-25T08:00:03","slug":"catching-more-sunlight-how-tandem-solar-panels-are-changing-solar-energy","status":"publish","type":"news","link":"https:\/\/www.uni.lu\/fstm-en\/news\/catching-more-sunlight-how-tandem-solar-panels-are-changing-solar-energy\/","title":{"rendered":"Catching more sunlight: how tandem solar panels are changing solar energy"},"content":{"rendered":"\n<section class=\"wp-block-unilux-blocks-free-section section\"><div class=\"container xl:max-w-screen-xl\">\n<p>Solar panels are everywhere, but did you know that a significant part of the sunlight they receive still goes to waste? <a href=\"https:\/\/www.uni.lu\/fstm-en\/people\/susanne-siebentritt\/\">Prof. Susanne Siebentritt <\/a>and her team at the University of Luxembourg are developing a new generation of solar cells that could change that. Their tandem solar cells are incredibly thin and efficient, converting more sunlight into electricity than traditional panels.<\/p>\n\n\n<div class=\"wp-block-unilux-blocks-spacer is-spacer-size-md\"><\/div>\n\n\n<h2 class=\"has-text-align-left wp-block-unilux-blocks-heading\"        id=\"why-current-solar-cells-arent-enough\"\n    >\nWhy current solar cells aren&#8217;t enough<\/h2>\n\n\n\n<p>Today, conventional solar cells can convert typically less than 25% of the sunlight they receive into electricity. Why so little? Imagine single cyclists pedaling their bikes. They can only go so fast on their own. Now picture two cyclists riding a tandem bike: together, they can pedal farther and faster. Tandem solar cells work in a similar way. By stacking two layers of semiconductor, each capturing different parts of sunlight, they combine their energy to produce more electricity than a single layer ever could.<\/p>\n\n\n\n<p>Even tandem cells, however, lose some energy. Prof. Siebentritt\u2019s team investigates exactly where these losses occur to understand their causes. By measuring the light emitted by the solar cell\u2019s semiconductor layer\u2014the part that absorbs sunlight and generates electricity\u2014they can pinpoint energy losses even before the cell is fully built.<\/p>\n\n\n<div class=\"wp-block-unilux-blocks-spacer is-spacer-size-sm\"><\/div>\n\n\n<h2 class=\"has-text-align-left wp-block-unilux-blocks-heading\"        id=\"a-barrier-that-helps-and-hinders-at-the-same-time\"\n    >\nA barrier that helps and hinders at the same time<\/h2>\n\n\n\n<p>One feature the team studies is the intentional compositional gradient, a deliberate change in the material across the layer.&nbsp;This gradient helps direct electron flow, improving current generation.<\/p>\n\n\n\n<p>However, it also introduces energy losses that reduce the cell\u2019s voltage. Accurate measurements reveal where the losses occur. With this information, the team can fine-tune the gradient\u2019s design to maximise benefits and limit drawbacks.<\/p>\n\n\n<div class=\"wp-block-unilux-blocks-spacer is-spacer-size-sm\"><\/div>\n\n\n<section class=\"wp-block-unilux-blocks-quote-people\">\n    <div class=\"quote-people\" role=\"group\">\n        <figure class=\"quote-people__body\">\n            <blockquote class=\"quote-people__blockquote\">\n    <span class=\"quote-people__quote\">\u201f<\/span>\n    \u201cThe tools we use to understand the losses in solar cells are very helpful to develop stable tandem solar cells. We are all very excited to contribute to the future of solar cells.\u201d\u00a0\u201d\n<\/blockquote>\n<div class=\"wp-block-unilux-blocks-wrapper quote-people__visual\"><figure class=\"wp-block-dev4-reusable-blocks-image  object-fit--cover\">\n    \n<img decoding=\"async\" class=\"wp-block-image unilux-custom-image-block\"\n                alt=\"\"\n            src=\"https:\/\/www.uni.lu\/wp-content\/uploads\/sites\/4\/2024\/10\/NTAwMDMwODlfX1N1c2FubmUgU0lFQkVOVFJJVFQ-2048x2048-1.jpg\"\n                srcset=\"https:\/\/www.uni.lu\/wp-content\/uploads\/sites\/4\/2024\/10\/NTAwMDMwODlfX1N1c2FubmUgU0lFQkVOVFJJVFQ-2048x2048-1-300x200.jpg 300w, https:\/\/www.uni.lu\/wp-content\/uploads\/sites\/4\/2024\/10\/NTAwMDMwODlfX1N1c2FubmUgU0lFQkVOVFJJVFQ-2048x2048-1-1024x683.jpg 1024w, https:\/\/www.uni.lu\/wp-content\/uploads\/sites\/4\/2024\/10\/NTAwMDMwODlfX1N1c2FubmUgU0lFQkVOVFJJVFQ-2048x2048-1-768x512.jpg 768w, https:\/\/www.uni.lu\/wp-content\/uploads\/sites\/4\/2024\/10\/NTAwMDMwODlfX1N1c2FubmUgU0lFQkVOVFJJVFQ-2048x2048-1-1536x1024.jpg 1536w, https:\/\/www.uni.lu\/wp-content\/uploads\/sites\/4\/2024\/10\/NTAwMDMwODlfX1N1c2FubmUgU0lFQkVOVFJJVFQ-2048x2048-1.jpg 2048w\"\n                style=\"object-position: 4.00% 57.00%; font-family: &quot;object-fit: cover; object-position: 4.00% 57.00%;&quot;; aspect-ratio: 1\/1; object-fit: cover; width: 100%;\"\n        loading=\"lazy\"\n\/>    <\/figure><\/div>\n\n<div class=\"wp-block-unilux-blocks-wrapper quote-people__figcaption\">\n<p class=\"quote-people__author wp-block-unilux-blocks-plain-text\">Prof. Susanne Siebentritt<\/p>\n\n\n<p class=\"quote-people__position wp-block-unilux-blocks-plain-text\">Professor in Physics<\/p>\n\n<div class=\"wp-block-unilux-blocks-simple-cta\">\n    <a\n        href=\"https:\/\/www.uni.lu\/fstm-en\/people\/susanne-siebentritt\/\"\n        title=\"View Profile\"\n        class=\"link-text link-text--icon quote-people__link\"\n        target=\"\"\n    >\n        <span class=\"link-text__body\">\n            <span class=\"link-text__name\">View profile<\/span>\n        <\/span>\n        <svg aria-hidden=\"true\" focusable=\"false\" class=\"icon icon-outline icon--arrow-right \"><use xlink:href=\"https:\/\/www.uni.lu\/wp-content\/themes\/unilux-theme\/assets\/images\/icons\/icons-outline.svg#icon--arrow-right\"><\/use><\/svg>    <\/a>\n<\/div>\n<\/div>\n        <\/figure>\n    <\/div>\n<\/section>\n\n<div class=\"wp-block-unilux-blocks-spacer is-spacer-size-sm\"><\/div>\n\n\n<h2 class=\"has-text-align-left wp-block-unilux-blocks-heading\"        id=\"the-future-of-solar-energy\"\n    >\nThe future of solar energy<\/h2>\n\n\n\n<p>Commercial solar cells are getting better in efficiency all the time. The team will produce tandem cells in the coming years to continue this trend. The solar cells investigated in Prof. Susanne Siebentritt\u2019s team can become the tandem partner for conventional solar cells in the future. They are particularly interesting because they maintain their efficiency under real world conditions for decades.&nbsp;<\/p>\n\n\n\n<p>Prof. Susanne Siebentritt and her team are also exploring designs without compositional gradients. These innovations have already led to record efficiencies, which is very promising for the future.&nbsp;&nbsp;\u201cThese record efficiencies and our tools to understand the losses in solar cells are very helpful to develop stable tandem solar cells. We are all very excited to contribute to the future of solar cells\u201d says Prof. Susanne Siebentritt.<\/p>\n\n\n\n<p>Looking ahead, Prof. Siebentritt aims to optimise alternative cell designs. New projects also aim to make the back layer of the solar cell see-through. This design allows the cell to capture light from the backside. Additionally, this lets the team use light-based measurements to see exactly where energy is lost inside the cell, helping them improve performance even further.<\/p>\n\n\n<div class=\"wp-block-unilux-blocks-spacer is-spacer-size-md\"><\/div>\n\n\n<p><em>The scientific\u00a0journal<\/em> <em><a href=\"https:\/\/journals.aps.org\/prxenergy\/abstract\/10.1103\/r25l-ftmp\" target=\"_blank\" rel=\"noreferrer noopener\">PRX Energy<\/a>\u00a0recently published this study<\/em>. <em>The solar cell has also been included in the recognised <a href=\"https:\/\/onlinelibrary.wiley.com\/doi\/10.1002\/pip.3919\" target=\"_blank\" rel=\"noreferrer noopener\">efficiency tables for photovoltaic devices<\/a>.<\/em><\/p>\n<\/div><\/section>\n","protected":false},"excerpt":{"rendered":"<p>By stacking two layers of semiconductor, each capturing different parts of sunlight, tandem solar cells combine their energy to produce more electricity than a single layer ever could.<\/p>\n","protected":false},"author":325,"featured_media":41998,"template":"","format":"standard","meta":{"featured_image_focal_point":{"x":0.65,"y":0.47},"show_featured_caption":false,"ulux_newsletter_groups":"","uluxPostTitle":"","uluxPrePostTitle":"","_trash_the_other_posts":false,"_price":"","_stock":"","_tribe_ticket_header":"","_tribe_default_ticket_provider":"","_tribe_ticket_capacity":"0","_ticket_start_date":"","_ticket_end_date":"","_tribe_ticket_show_description":"","_tribe_ticket_show_not_going":false,"_tribe_ticket_use_global_stock":"","_tribe_ticket_global_stock_level":"","_global_stock_mode":"","_global_stock_cap":"","_tribe_rsvp_for_event":"","_tribe_ticket_going_count":"","_tribe_ticket_not_going_count":"","_tribe_tickets_list":"[]","_tribe_ticket_has_attendee_info_fields":false},"news-category":[8],"news-topic":[25],"organisation":[80,29],"authorship":[325],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v22.3 (Yoast SEO v22.3) - 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