--- title: LONGi Sets a New World Record of 27.09% for the Efficiency of Silicon Heterojunction Back-Contact (HBC) Solar Cells -LONGi description: LONGi announced today that it has set a new world record of 27.09% for the efficiency of crystalline silicon heterojunction back-contact (HBC) solar cells. image: https://blog.nastechsolar.com/hubfs/Imported_Blog_Media/heterojunction_back_contact_battery_2023121903_a280153179-1.jpg --- [Skip to content](https://blog.nastechsolar.com/en/news/heterojunction-back-contact-battery#main-content) [![Home of Clean Energy](https://blog.nastechsolar.com/hs-fs/hubfs/Nastech%20logo-1.png?width=410&height=139&name=Nastech%20logo-1.png)](https://nastechsolar.com) - [Contact Us](https://blog.nastechsolar.com/contact-us) - [News](https://blog.nastechsolar.com/en) Open main navigation Close main navigation - [Contact Us](https://blog.nastechsolar.com/contact-us) - [News](https://blog.nastechsolar.com/en) - [Go Back to > Nastechsolar](https://nastechsolar.com) [Go Back to > Nastechsolar](https://nastechsolar.com) [All posts](https://blog.nastechsolar.com/en/all) March 25, 2024 # LONGi Sets a New World Record of 27.09% for the Efficiency of Silicon Heterojunction Back-Contact (HBC) Solar Cells -LONGi By  [Longi](https://blog.nastechsolar.com/en/author/longi)  ·  1 minute read **Xi’an, December 18, 2023**-The world-leading solar technology company, LONGi Green Energy Technology Co., Ltd. (hereafter as "LONGi"), announced today that it has set a new world record of 27.09% for the efficiency of crystalline silicon heterojunction back-contact (HBC) solar cells, certified by the Institute for Solar Energy Research Hamelin (ISFH) in Germany. The 27.09% efficiency HBC cell was developed independently in LONGi using an all-laser patterning process. This is a new world record for single-crystalline silicon solar cells, breaking the [**26.81% efficiency record**](https://www.longi.com/en/news/propelling-the-transformation/) announced in November 2022. ![](https://blog.nastechsolar.com/hubfs/Imported_Blog_Media/heterojunction_back_contact_battery_2023121903_a280153179-1.jpg) To mitigate the problem of high patterning cost for back-contact cells, the R&D team in LONGi has been continuing technological innovation, abandoned the costly photolithography process, and successfully developed an all-laser patterning process. The all-laser patterning process was utilized in the 27.09% efficiency record cell. Another advantage of HBC cells over bifacial heterojunction solar cells is the reduced usage of transparent conductive oxide layers (ITO). Through continuous technological improvements, LONGi's R&D team has developed an ultra-thin TCO layer with reduced indium usage. The indium usage of the 27.09% efficiency record cell is only 1/5 of that of traditional bifacial heterojunction solar cells. “Innovation is the core competitiveness of enterprises and LONGi is committed to 'making the best of solar energy to build a green world'. We at LONGi believe that photovoltaics will play a crucial role in the worldwide energy transition,” said Li Zhenguo, Founder & President of LONGi. Li highlighted the company's continuous pursuit of high-quality product and high-efficiency solar cell technology. **About LONGi** Founded in 2000, LONGi is committed to being the world’s leading solar technology company, focusing on customer-driven value creation for full scenario energy transformation. Under its mission of 'making the best of solar energy to build a green world', LONGi has dedicated itself to technology innovation and established five business sectors, covering [**mono silicon wafers**](https://www.longi.com/en/products/silicon/) cells and[ **modules**](https://www.longi.com/en/products/modules/), [**commercial & industrial distributed solar solutions**](https://www.longi.com/en/solutions/residential/), [**green energy solutions**](https://www.longi.com/en/solutions/detail/eco-friendly-solar/) and [**hydrogen equipment**](https://www.longi.com/en/products/hydrogen/). The company has honed its capabilities to provide green energy and has more recently, also embraced green hydrogen products and solutions to support global zero carbon development. [**www.longi.com**](https://www.longi.com/) Share: [facebook-f icon](http://www.facebook.com/share.php?u=https://blog.nastechsolar.com/en/news/heterojunction-back-contact-battery) [linkedin-in icon](http://www.linkedin.com/shareArticle?mini=true&url=https://blog.nastechsolar.com/en/news/heterojunction-back-contact-battery) [twitter icon](https://twitter.com/intent/tweet?url=https://blog.nastechsolar.com/en/news/heterojunction-back-contact-battery) [pinterest-p icon](http://pinterest.com/pin/create/link/?url=https://blog.nastechsolar.com/en/news/heterojunction-back-contact-battery) [envelope icon](mailto:?body=https://blog.nastechsolar.com/en/news/heterojunction-back-contact-battery) ## Related posts [![](https://blog.nastechsolar.com/hubfs/Imported_Blog_Media/Longi_climate_action_cover_EN_858730e36d.jpg)](https://blog.nastechsolar.com/en/in/news/white-paper-on-climate-action-2022?hsLang=en) ### [LONGi displays latest Hi-MO 6 series modules at COP27, releases 2nd White Paper on Climate Action - LONGi](https://blog.nastechsolar.com/en/in/news/white-paper-on-climate-action-2022?hsLang=en) [![](https://blog.nastechsolar.com/hubfs/Imported_Blog_Media/Longi_climate_action_cover_EN_858730e36d-1.jpg)](https://blog.nastechsolar.com/en/news/white-paper-on-climate-action-2022?hsLang=en) ### [LONGi displays latest Hi-MO 6 series modules at COP27, releases 2nd White Paper on Climate Action - LONGi](https://blog.nastechsolar.com/en/news/white-paper-on-climate-action-2022?hsLang=en) [![](https://blog.nastechsolar.com/hubfs/Imported_Blog_Media/Longi_climate_action_cover_EN_858730e36d-2.jpg)](https://blog.nastechsolar.com/en/us/news/white-paper-on-climate-action-2022?hsLang=en) ### [LONGi displays latest Hi-MO 6 series modules at COP27, releases 2nd White Paper on Climate Action - LONGi](https://blog.nastechsolar.com/en/us/news/white-paper-on-climate-action-2022?hsLang=en) [![Home of Clean Energy](https://blog.nastechsolar.com/hs-fs/hubfs/Nastech%20logo-1.png?width=410&height=139&name=Nastech%20logo-1.png "Home of Clean Energy")](http://nastech.ae) **Pages** Home Services Portfolio About Contact FAQ Landing Page Thank You **Resources** Blog Watch a Demo Academy Webinars Product Changes Copyright © 2010 - 2026, NASTECH DMCC ```json { "@context" : "https://schema.org", "@type" : "BlogPosting", "author" : { "@type" : "Person", "name" : "Longi", "url" : "https://blog.nastechsolar.com/en/author/longi" }, "dateModified" : "2024-03-25T13:12:02.162Z", "datePublished" : "2023-10-17T20:00:00.000Z", "headline" : "LONGi Sets a New World Record of 27.09% for the Efficiency of Silicon Heterojunction Back-Contact (HBC) Solar Cells -LONGi", "image" : [ "https://blog.nastechsolar.com/hubfs/Imported_Blog_Media/heterojunction_back_contact_battery_2023121903_a280153179-1.jpg" ], "mainEntityOfPage" : { "@id" : "https://blog.nastechsolar.com/en/news/heterojunction-back-contact-battery", "@type" : "WebPage" }, "publisher" : { "@type" : "Organization", "logo" : { "@type" : "ImageObject", "url" : "https://blog.nastechsolar.com/hubfs/Nastech%20logo-1.png" }, "name" : "NASTECH DMCC" } } ``` ```json { "@context" : "http://schema.org", "@type" : "Article", "author" : { "@type" : "Person", "name" : [ "Longi" ], "url" : "https://blog.nastechsolar.com/en/author/longi" }, "datePublished" : "2023-10-17T20:00:00+0000", "description" : "LONGi announced today that it has set a new world record of 27.09% for the efficiency of crystalline silicon heterojunction back-contact (HBC) solar cells.", "headline" : "LONGi Sets a New World Record of 27.09% for the Efficiency of Silicon Heterojunction Back-Contact (HBC) Solar Cells -LONGi", "image" : "https://23100838.fs1.hubspotusercontent-na1.net/hubfs/23100838/Imported_Blog_Media/heterojunction_back_contact_battery_2023121903_a280153179-1.jpg", "publisher" : { "@type" : "Organization", "logo" : { "@type" : "ImageObject", "url" : "https://cdn2.hubspot.net/hubfs/23100838/Nastech%20logo-1.png" }, "name" : "NASTECH DMCC" }, "url" : "https://blog.nastechsolar.com/en/news/heterojunction-back-contact-battery" } ```