--- description: The 24.2% efficient POLO back junction solar cell built with PECVD doped in Czochralski-grown silicon wafer shows better results. title: 24.2% Efficient POLO Back Junction Solar Cell Built with PECVD by ISFH and Centrotherm Scientists - Energy Theory image: https://energytheory.com/wp-content/uploads/2024/09/24.2-Efficient-POLO-Back-Junction-Solar-Cell-Built-with-PECVD-by-ISFH-and-Centrotherm-Scientists.png --- [ Close Menu ](#) * [About](https://energytheory.com/about-us/) * [EV](https://energytheory.com/category/electric-vehicles/) * [FAQs](https://energytheory.com/category/faqs/) * [Glossary](https://energytheory.com/category/glossary/) * [Green](https://energytheory.com/category/green/) * [Renewable](https://energytheory.com/category/renewable/) * [Sustainable](https://energytheory.com/category/sustainable/) * [Energy Economy](https://energytheory.com/category/energy-economy/) * [Energy Services](https://energytheory.com/category/energy-services/) * [Solar](https://energytheory.com/category/solar/) * [Sustainable](https://energytheory.com/category/sustainable/) * [News](https://energytheory.com/category/latest-news/) * [Language](#) [ ![Energy Theory](https://energytheory.com/wp-content/uploads/2022/11/2e3rtgthghnm.png) ](https://energytheory.com/ "Energy Theory") ![en](https://cdn.gtranslate.net/flags/svg/en.svg)English [![es](https://cdn.gtranslate.net/flags/svg/es.svg) Spanish](#) [![fr](https://cdn.gtranslate.net/flags/svg/fr.svg) French](#) [![en](https://cdn.gtranslate.net/flags/svg/en.svg) English](#) [![it](https://cdn.gtranslate.net/flags/svg/it.svg) Italian](#) [![zh-CN](https://cdn.gtranslate.net/flags/svg/zh-CN.svg) Chinese (Simplified)](#) [![nl](https://cdn.gtranslate.net/flags/svg/nl.svg) Dutch](#) [![fi](https://cdn.gtranslate.net/flags/svg/fi.svg) Finnish](#) [![de](https://cdn.gtranslate.net/flags/svg/de.svg) German](#) [![hi](https://cdn.gtranslate.net/flags/svg/hi.svg) Hindi](#) [![ja](https://cdn.gtranslate.net/flags/svg/ja.svg) Japanese](#) [![pl](https://cdn.gtranslate.net/flags/svg/pl.svg) Polish](#) [![pt](https://cdn.gtranslate.net/flags/svg/pt.svg) Portuguese](#) [![ru](https://cdn.gtranslate.net/flags/svg/ru.svg) Russian](#) [ ![Energy Theory](https://energytheory.com/wp-content/uploads/2022/11/2e3rtgthghnm.png) ](https://energytheory.com/ "Energy Theory") ![en](https://cdn.gtranslate.net/flags/svg/en.svg)English [![es](https://cdn.gtranslate.net/flags/svg/es.svg) Spanish](#) [![fr](https://cdn.gtranslate.net/flags/svg/fr.svg) French](#) [![en](https://cdn.gtranslate.net/flags/svg/en.svg) English](#) [![it](https://cdn.gtranslate.net/flags/svg/it.svg) Italian](#) [![zh-CN](https://cdn.gtranslate.net/flags/svg/zh-CN.svg) Chinese (Simplified)](#) [![nl](https://cdn.gtranslate.net/flags/svg/nl.svg) Dutch](#) [![fi](https://cdn.gtranslate.net/flags/svg/fi.svg) Finnish](#) [![de](https://cdn.gtranslate.net/flags/svg/de.svg) German](#) [![hi](https://cdn.gtranslate.net/flags/svg/hi.svg) Hindi](#) [![ja](https://cdn.gtranslate.net/flags/svg/ja.svg) Japanese](#) [![pl](https://cdn.gtranslate.net/flags/svg/pl.svg) Polish](#) [![pt](https://cdn.gtranslate.net/flags/svg/pt.svg) Portuguese](#) [![ru](https://cdn.gtranslate.net/flags/svg/ru.svg) Russian](#) [Latest News](https://energytheory.com/category/latest-news/) # 24.2% Efficient POLO Back Junction Solar Cell Built with PECVD by ISFH and Centrotherm Scientists The report shows that non-expensive methods can also produce more effective results than expensive ones. By [Elliot Clark](https://energytheory.com/author/elliot%5Fclark/)September 25, 20242 Mins Read ![24.2% Efficient POLO Back Junction Solar Cell Built with PECVD by ISFH and Centrotherm Scientists](https://energytheory.com/wp-content/uploads/2024/09/24.2-Efficient-POLO-Back-Junction-Solar-Cell-Built-with-PECVD-by-ISFH-and-Centrotherm-Scientists-1024x683.webp "24.2% Efficient POLO Back Junction Solar Cell Built with PECVD by ISFH and Centrotherm Scientists") Researchers are in the race to make new, better, and more efficient solar cells. In one such attempt, scientists developed a 24.2% efficient POLO back junction solar cell built with PECVD. The team from [Institute for Solar Energy Research Hamelin](https://isfh.de/?lang=en) (ISFH) and German PV equipment manufacturer [Centrotherm](https://www.centrotherm.de/en/) worked together. They have developed highly efficient n+-type polysilicon on oxide (POLO) back junction solar cells. For this, an industrial plasma-enhanced chemical vapor deposition (PECVD) system with a low-frequency plasma source was used. The device achieved a slightly higher efficiency than the reference device fabricated through more expensive atomic layer deposition (ALD). Scientists used an industrial batch-type LF-PECVD system by Centrotherm to deposit the AIOx layer. The lead author of the study, [Byungsul Min](https://scholar.google.de/citations?user=DHuAqfUAAAAJ&hl=de) said, _“Our study shows for the first time an effective industrial cleaning and passivation for the undiffused textured front side with excellent passivation quality. Especially, the AlOx/SiNy passivation layer stack is fabricated with an industrial plasma enhanced chemical vapor deposition (PECVD) system with a low-frequency (LF) plasma source which is much more cost-effective than atomic layer deposition (ALD) systems or PECVD systems with a high-frequency (HF) plasma source.”_ ### **Highlights** * The POLO back junction solar cell doped in Czochralski-grown silicon wafer measures **156.75 mm x 156.75 mm**. * The **resistivity** of the silicon wafer is 0.73 Ωcm. * **The POLO cell achieved**: power conversion/efficiency (24.2%), short-circuit current density (40.2 mA/cm2), fill factor (83.0%), and open circuit voltage (725 mV). These results were confirmed by ISFH CalTeC. * **Another device** on a textured gallium-doped Czochralski-grown wafer with a resistivity of 0.9 Ωcm. It has a 10 nm thick layer of AIOx deposited by ALD and a SiN y layer. * This device **achieved**: efficiency (24.1%), short-circuit current density (39.9 mA/cm2), fill factor (83.2%), and open circuit voltage (725 mV). [28% efficient perovskite silicon tandem solar module by PeroNova](https://energytheory.com/28-efficient-perovskite-silicon-tandem-solar-module-by-peronova/) According to the researchers, _“The integration of this passivation sequence into our current process flow for POLO BJ solar cells has been successfully demonstrated with POLO BJ solar cells, which show even higher cell efficiencies than the reference fabricated with lab-scale processes.”_ **Source**: [24.2% efficient POLO back junction solar cell with an AlOx/SiNy](https://onlinelibrary.wiley.com/doi/abs/10.1002/pip.3828) Share. 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With a background in environmental science, he has a deep understanding of the issues facing our planet and is committed to educating others on how they can make a difference. #### Related Posts [![31.6% Efficient Perovskite Silicon Tandem Solar Cell by Fraunhofer ISE](https://energytheory.com/wp-content/uploads/2024/09/31.6-300x200.webp "31.6% Efficient Perovskite Silicon Tandem Solar Cell by Fraunhofer ISE")](https://energytheory.com/31-6-efficient-perovskite-silicon-tandem-solar-cell-by-fraunhofer-ise/ "31.6% Efficient Perovskite Silicon Tandem Solar Cell by Fraunhofer ISE") #### [31.6% Efficient Perovskite Silicon Tandem Solar Cell by Fraunhofer ISE](https://energytheory.com/31-6-efficient-perovskite-silicon-tandem-solar-cell-by-fraunhofer-ise/) September 27, 2024 [![New Walkable PV Panels by Hungary-based Platio Solar](https://energytheory.com/wp-content/uploads/2024/09/New-Walkable-PV-Panels-by-Hungary-based-Platio-Solar-300x200.webp "New Walkable PV Panels by Hungary-based Platio Solar")](https://energytheory.com/new-walkable-pv-panels-by-hungary-based-platio-solar/ "New Walkable PV Panels by Hungary-based Platio Solar") #### [New Walkable PV Panels by Hungary-based Platio Solar](https://energytheory.com/new-walkable-pv-panels-by-hungary-based-platio-solar/) September 24, 2024 [![A Safe and Stable Lithium-Sulfur Battery that can be Cut and Folded](https://energytheory.com/wp-content/uploads/2024/09/Stable-Cycling-and-High-Safety-Transition-Metal-Sulfide-Based-Lithium-Batteries-300x200.png "A Safe and Stable Lithium-Sulfur Battery that Can be Cut and Folded")](https://energytheory.com/a-safe-and-stable-lithium-sulfur-battery-that-can-be-cut-and-folded/ "A Safe and Stable Lithium-Sulfur Battery that Can be Cut and Folded") #### [A Safe and Stable Lithium-Sulfur Battery that Can be Cut and Folded](https://energytheory.com/a-safe-and-stable-lithium-sulfur-battery-that-can-be-cut-and-folded/) September 20, 2024 [Add A Comment ](#) Leave A Reply [Cancel Reply](https://energytheory.com/24-2-efficient-polo-back-junction-solar-cell-built-with-pecvd-by-isfh-and-centrotherm-scientists/#respond) Save my name, email, and website in this browser for the next time I comment. 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