{"id":33510,"date":"2025-03-21T17:17:12","date_gmt":"2025-03-21T09:17:12","guid":{"rendered":"https:\/\/www.ray-tron.com\/?p=33510"},"modified":"2025-03-21T17:17:19","modified_gmt":"2025-03-21T09:17:19","slug":"the-reason-why-traditional-crystalline-silicon-photovoltaic-modules-choose-sn60pb40-as-the-tin-layer","status":"publish","type":"post","link":"https:\/\/www.ray-tron.com\/en\/the-reason-why-traditional-crystalline-silicon-photovoltaic-modules-choose-sn60pb40-as-the-tin-layer\/","title":{"rendered":"The reason why traditional crystalline silicon photovoltaic modules choose SN60PB40 as the tin layer"},"content":{"rendered":"<p>SN60PB40 (60% tin + 40% lead) is a traditional crystalline silicon<a href=\"https:\/\/www.ray-tron.com\/en\/\" data-internallinksmanager029f6b8e52c=\"14\" title=\"Photovoltaic modules\">Photovoltaic modules<\/a>The most common solder strip coating material, mainly used for <strong>PERC, monocrystalline silicon, multicrystalline silicon<\/strong> The following are the main reasons for choosing this tin plating type:<\/p><h3 class=\"wp-block-heading\"><strong>1. Excellent welding performance<\/strong><\/h3><ul class=\"wp-block-list\"><li><strong>Good wettability<\/strong><ul class=\"wp-block-list\"><li>SN60PB40 has better wettability than pure tin (SN100) and can adhere better to<a href=\"https:\/\/www.ray-tron.com\/en\/\" data-internallinksmanager029f6b8e52c=\"15\" title=\"Solar panels\">Solar Cells<\/a>The silver paste on the main grid line of the film.<\/li>\n\n<li>It has strong wettability and can spread quickly to form reliable solder joints, avoiding cold solder joints and false solder joints, ensuring that the solder joints are firm.<\/li><\/ul><\/li>\n\n<li><strong>Welding window width<\/strong><ul class=\"wp-block-list\"><li>Melting point range <strong>183\u2103-190\u2103<\/strong>, suitable for most string welding processes and compatible with different types of welding equipment.<\/li>\n\n<li>The welding temperature window is wide, over-welding or cold welding is less likely to occur, and the production yield is improved.<\/li><\/ul><\/li><\/ul><hr class=\"wp-block-separator has-alpha-channel-opacity\"\/><h3 class=\"wp-block-heading\"><strong>2. Reduce welding temperature and reduce battery cell damage<\/strong><\/h3><ul class=\"wp-block-list\"><li><strong>Low melting point (183\u2103-190\u2103)<\/strong><ul class=\"wp-block-list\"><li>SN60PB40 has a low melting point, which is conducive to completing welding at a lower temperature and effectively preventing high temperature from causing thermal stress damage to the battery cell.<\/li>\n\n<li>Especially for <strong>Polycrystalline silicon cells and thin-film cells<\/strong> It has a more protective effect and can avoid problems such as micro cracks and increased fragmentation rate caused by high temperature.<\/li><\/ul><\/li>\n\n<li><strong>Protecting silver paste busbars<\/strong><ul class=\"wp-block-list\"><li>Lower welding temperature can reduce the melting and diffusion of silver paste busbars, avoid burning or breaking of busbars due to high temperature, and improve welding quality.<\/li><\/ul><\/li><\/ul><hr class=\"wp-block-separator has-alpha-channel-opacity\"\/><h3 class=\"wp-block-heading\"><strong>3. Excellent mechanical strength and crack resistance<\/strong><\/h3><ul class=\"wp-block-list\"><li><strong>Strong solder joints and high tensile strength<\/strong><ul class=\"wp-block-list\"><li>The alloy composition containing 40% lead makes the solder joint have higher mechanical strength and crack resistance after welding, and can withstand the mechanical stress caused by thermal expansion and contraction.<\/li>\n\n<li>For photovoltaic modules <strong>Thermal cycle life<\/strong>(Thermal Cycling) has been greatly improved to prevent solder joint cracking and improve long-term reliability.<\/li><\/ul><\/li>\n\n<li><strong>Better thermal fatigue resistance<\/strong><ul class=\"wp-block-list\"><li>SN60PB40 has better thermal fatigue resistance in high temperature environments, and the solder joints are not easily desoldered due to thermal expansion and contraction, which helps to extend the service life of photovoltaic modules (25 years+).<\/li><\/ul><\/li><\/ul><h3 class=\"wp-block-heading\"><strong>4. Excellent conductivity, reducing power loss<\/strong><\/h3><ul class=\"wp-block-list\"><li><strong>Low resistivity, improved conductivity<\/strong><ul class=\"wp-block-list\"><li>SN60PB40 has a low resistivity (about 14.5 \u00b5\u03a9\u00b7cm), which can effectively reduce<a href=\"https:\/\/www.ray-tron.com\/en\/pvribbon\/\" data-internallinksmanager029f6b8e52c=\"43\" title=\"Photovoltaic welding ribbon\">Photovoltaic welding ribbon<\/a>resistance loss.<\/li>\n\n<li>During the string welding process, the current can be transmitted to the busbars of the battery cells more stably, improving the overall power output of the photovoltaic module.<\/li><\/ul><\/li><\/ul><hr class=\"wp-block-separator has-alpha-channel-opacity\"\/><h3 class=\"wp-block-heading\"><strong>5. Low cost and mature technology<\/strong><\/h3><ul class=\"wp-block-list\"><li><strong>Lower material cost<\/strong><ul class=\"wp-block-list\"><li>SN60PB40 has lower raw material cost and has a more advantageous production cost compared to lead-free solders (such as SN100 or SN-Ag).<\/li>\n\n<li>Due to its mature technology and wide market application, it can effectively reduce the production cost of photovoltaic modules and improve cost-effectiveness.<\/li><\/ul><\/li>\n\n<li><strong>Strong compatibility<\/strong><ul class=\"wp-block-list\"><li>Traditional string soldering machines and convergence soldering equipment all support SN60PB40, and the process adjustment cost is relatively low.<\/li><\/ul><\/li><\/ul><hr class=\"wp-block-separator has-alpha-channel-opacity\"\/><h3 class=\"wp-block-heading\"><strong>6. Disadvantages and future trends<\/strong><\/h3><ul class=\"wp-block-list\"><li><strong>Environmental issues<\/strong><ul class=\"wp-block-list\"><li>Lead-containing solder ribbons do not comply with the EU RoHS (Restriction of Hazardous Substances Directive), so in the context of increasingly stringent environmental regulations, lead-free solder ribbons (such as SN100 and SN-Ag) are gradually replacing SN60PB40.<\/li><\/ul><\/li>\n\n<li><strong>Applicability Limitations<\/strong><ul class=\"wp-block-list\"><li>New high-efficiency battery technologies (such as TOPCon, HJT, and IBC) are more likely to use <strong>Lead-free solder ribbon<\/strong>, and gradually reduce the application of SN60PB40.<\/li><\/ul><\/li><\/ul><h2 class=\"wp-block-heading\"><strong>Summary: Why choose SN60PB40?<\/strong><\/h2><figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th><strong>Advantages<\/strong><\/th><th><strong>Specific manifestations<\/strong><\/th><\/tr><\/thead><tbody><tr><td>Excellent welding performance<\/td><td>Good wettability, strong solder joints, wide soldering window<\/td><\/tr><tr><td>Low melting point<\/td><td>183\u2103-190\u2103, reduce battery damage<\/td><\/tr><tr><td>High mechanical strength<\/td><td>Strong crack resistance, excellent thermal fatigue resistance of solder joints<\/td><\/tr><tr><td>Good conductivity<\/td><td>Low resistivity, reducing power loss<\/td><\/tr><tr><td>Cost Advantage<\/td><td>Low material cost, strong compatibility, suitable for mass production<\/td><\/tr><\/tbody><\/table><\/figure><hr class=\"wp-block-separator has-alpha-channel-opacity\"\/><h2 class=\"wp-block-heading\"><strong>Applicable scenarios<\/strong><\/h2><ul class=\"wp-block-list\"><li>Tradition <strong>PERC<\/strong> Monocrystalline silicon and polycrystalline silicon photovoltaic cells<\/li>\n\n<li>Mass production of common photovoltaic modules<\/li>\n\n<li>Projects with high requirements on welding stability and crack resistance<\/li><\/ul>","protected":false},"excerpt":{"rendered":"<p>SN60PB40 (60% tin + 40% lead) is the most common solder strip coating material in traditional crystalline silicon photovoltaic modules, mainly used in PERC, monocrystalline silicon [\u2026]<\/p>","protected":false},"author":1,"featured_media":9170,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center 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