21.5%以上效率Panda-TOPCon双面电池技术研究

RESEARCH OF >21.5% HIGH EFFICIENCY PANDA-TOPCON BIFACIAL SOLAR CELL

主要研究可应用于规模化生产的TOPCon(tunnel oxide passivated contact)电池技术,该技术既可改善电池表面钝化又可促进多数载流子传输,进而提升电池的开路电压和填充因子。Panda-TOPCon电池是在英利熊猫(Panda)电池基础上引入TOPCon技术,在研究中对氧化硅/多晶硅叠层(SiO_2/polySi)的表面钝化效果在n型硅片上进行验证,通过优化该结构中SiO_2/polySi掺杂、SiO_2成膜方式以及polySi厚度等,最终制备的Panda-TOPCon电池的开路电压达到676 mV,填充因子达到80%,实现了21.54%的光电转换效率。

In this work we study the tunnel oxide passivated contact(TOPCon)cell technology was researched.The technology can improve the surface passivation of solar cells and accelerate the majority carrier transportation,result to the increasing of the open circuit voltage and the fill factor.In our work,Panda-TOPCon technology introduced TOPCon technology based on Yingli Panda cells.In order to evaluate the surface passivation effect of the SiO2/polySi layer on n type Si.Through optimizing the doping-porcess of SiO2/polySi layer,growth methods of SiO2 layer and the thickness of polySi layer,the champion Panda-TOPCon cell with Eff of 21.54%,Vocof 676 mV,and FF of 80%was obtained.