{"id":893,"date":"2025-10-09T18:11:38","date_gmt":"2025-10-09T18:11:38","guid":{"rendered":"https:\/\/www.science.sbtechem.com\/?p=893"},"modified":"2025-10-09T18:11:38","modified_gmt":"2025-10-09T18:11:38","slug":"stanford-scientists-create-solar-panels-that-can-generate-power-at-night","status":"publish","type":"post","link":"https:\/\/www.science.sbtechem.com\/?p=893","title":{"rendered":"Stanford Scientists Create Solar Panels That Can Generate Power at Night"},"content":{"rendered":"<div class=\"7a19b57d3f502e506f541b4c6899bb20\" data-index=\"1\" style=\"float: none; margin:10px 0 10px 0; text-align:center;\">\n<script type=\"text\/javascript\">\r\n\tatOptions = {\r\n\t\t'key' : '763760c8ca37b90150f32ad474f817c0',\r\n\t\t'format' : 'iframe',\r\n\t\t'height' : 250,\r\n\t\t'width' : 300,\r\n\t\t'params' : {}\r\n\t};\r\n<\/script>\r\n<script type=\"text\/javascript\" src=\"\/\/electthirteenth.com\/763760c8ca37b90150f32ad474f817c0\/invoke.js\"><\/script>\n<\/div>\n<p>For decades, solar panels have been a symbol of clean energy \u2014 but they\u2019ve always had one major limitation: they only work when the sun is shining. That could soon change. Researchers at Stanford University have developed a new way for solar panels to generate electricity even at night \u2014 by tapping into a natural phenomenon known as Earth\u2019s radiative cooling.<\/p>\n<p>&nbsp;<\/p>\n<p>This breakthrough could reshape the future of renewable energy, making solar power more reliable around the clock.<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&#8212;<\/p>\n<p>&nbsp;<\/p>\n<p>How Solar Panels Can Work After Sunset<\/p>\n<p>&nbsp;<\/p>\n<p>Traditional solar panels convert sunlight into electricity through photovoltaic cells. When the sun goes down, they stop producing power. To keep the lights on at night, solar farms and homes usually rely on batteries or the electrical grid.<\/p>\n<p>&nbsp;<\/p>\n<p>But Stanford\u2019s team, led by Professor Shanhui Fan from the Department of Electrical Engineering, found another way. Their approach doesn\u2019t use sunlight at all. Instead, it takes advantage of the heat difference between the Earth and outer space.<\/p>\n<p>&nbsp;<\/p>\n<p>Here\u2019s how it works:<\/p>\n<p>&nbsp;<\/p>\n<p>At night, any surface facing the clear sky naturally loses heat by radiating infrared energy into the coldness of space.<\/p>\n<p>&nbsp;<\/p>\n<p>As a result, the surface becomes slightly cooler than the surrounding air.<\/p>\n<p>&nbsp;<\/p>\n<p>The Stanford researchers connected a thermoelectric generator (TEG) to a standard solar panel. This small device converts temperature differences into electricity.<\/p>\n<p>&nbsp;<\/p>\n<p>The result: even in total darkness, the system can produce power by harnessing the flow of heat from the warmer air to the cooler panel surface.<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&#8212;<\/p>\n<p>&nbsp;<\/p>\n<p>Results From the Experiment<\/p>\n<p>&nbsp;<\/p>\n<p>The team tested their prototype on a rooftop in Stanford, California, under clear night skies. Their setup was able to produce around 50 milliwatts of electricity per square meter (50 mW\/m\u00b2) of solar panel area.<\/p>\n<p>&nbsp;<\/p>\n<p>That might not sound like much compared to the hundreds of watts per square meter that panels generate during the day, but it\u2019s enough to power low-energy devices like sensors, LED lights, or small electronics \u2014 and more importantly, it proves that solar installations don\u2019t have to go completely dark at night.<\/p>\n<p>&nbsp;<\/p>\n<p>According to the researchers, this technique can be further improved. With optimized materials and better thermoelectric generators, the nighttime output could increase significantly in the future.<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&#8212;<\/p>\n<p>&nbsp;<\/p>\n<p>Why This Breakthrough Matters<\/p>\n<p>&nbsp;<\/p>\n<p>Solar energy is one of the fastest-growing sources of clean power worldwide, but its intermittency \u2014 the fact that it stops at night or on cloudy days \u2014 is a big challenge. Most solar systems today depend on large, expensive batteries to store daytime energy for nighttime use.<\/p>\n<p>&nbsp;<\/p>\n<p>Stanford\u2019s discovery offers a new piece of the puzzle. While it won\u2019t replace batteries or grid power anytime soon, it could:<\/p>\n<p>&nbsp;<\/p>\n<p>Extend the working hours of solar installations, improving their overall efficiency.<\/p>\n<p>&nbsp;<\/p>\n<p>Provide continuous power for remote or off-grid sensors where replacing batteries is difficult.<\/p>\n<p>&nbsp;<\/p>\n<p>Reduce the cost and complexity of some small-scale solar systems.<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>\u201cPhotovoltaic panels are optimized for daytime, but we often forget there\u2019s a lot of useful physics at night too,\u201d said Professor Fan. \u201cOur work shows we can capture some of that energy instead of wasting it.\u201d<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&#8212;<\/p>\n<p>&nbsp;<\/p>\n<p>The Road Ahead<\/p>\n<p>&nbsp;<\/p>\n<p>The research is still in its early stages. To become commercially viable, engineers will need to boost power output, make the technology cost-effective, and integrate it seamlessly with existing solar panels.<\/p>\n<p>&nbsp;<\/p>\n<p>But the potential is exciting. As renewable energy plays an ever-bigger role in powering our world, innovations like this could help us move closer to 24-hour clean energy \u2014 not just when the sun shines, but long after it sets.<\/p>\n<p>&nbsp;<\/p>\n<p>For now, Stanford\u2019s nighttime solar panels are a reminder that nature\u2019s energy isn\u2019t limited to daylight. Even the Earth\u2019s own heat, radiating quietly into the cold of space, can be turned into electricity with the right technology \u2014 a small but powerful step toward a more sustainable future.<\/p>\n<!--CusAds0-->\n<div style=\"font-size: 0px; height: 0px; line-height: 0px; margin: 0; padding: 0; clear: both;\"><\/div>","protected":false},"excerpt":{"rendered":"<p>For decades, solar panels have been a symbol of clean energy \u2014 but they\u2019ve always had one major limitation: they only work when the sun is shining. That could soon change. Researchers at Stanford University have developed a new way for solar panels to generate electricity even at night \u2014 by tapping into a natural\u2026 <span class=\"read-more\"><a href=\"https:\/\/www.science.sbtechem.com\/?p=893\">Read More &raquo;<\/a><\/span><\/p>\n","protected":false},"author":1,"featured_media":894,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-893","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-uncategorized"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/www.science.sbtechem.com\/index.php?rest_route=\/wp\/v2\/posts\/893","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.science.sbtechem.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.science.sbtechem.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.science.sbtechem.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.science.sbtechem.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=893"}],"version-history":[{"count":1,"href":"https:\/\/www.science.sbtechem.com\/index.php?rest_route=\/wp\/v2\/posts\/893\/revisions"}],"predecessor-version":[{"id":895,"href":"https:\/\/www.science.sbtechem.com\/index.php?rest_route=\/wp\/v2\/posts\/893\/revisions\/895"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.science.sbtechem.com\/index.php?rest_route=\/wp\/v2\/media\/894"}],"wp:attachment":[{"href":"https:\/\/www.science.sbtechem.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=893"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.science.sbtechem.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=893"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.science.sbtechem.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=893"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}