Enhancing performance is a necessary challenge for the continuous advancement of the photovoltaic industry. In the commercial domain, alongside increasing market demands, the visual appeal of solar panels is also receiving growing emphasis. Consequently, developing modules that combine higher power conversion efficiency (PCE) with superior aesthetic appearance has become increasingly important. Back-contact (BC) silicon solar cells offer structural advantages: their front side is free of grid lines, allowing greater design freedom for visual appeal, and they possess the highest theoretical PCE among single-junction silicon solar cells. Effectively utilizing these structural features is crucial for achieving high-performance photovoltaic cells and gaining deeper insights into their industrial potential.
Recognizing this, Li Zhenguo from Longi Green Energy Technology, in collaboration with Li Junshuai from Lanzhou University, published a paper titled “Total-area world-record efficiency of 27.03% for 350.0 cm² commercial-sized single-junction silicon solar cells” in the journal Nature Communications.
This research developed a convenient dual-side light management strategy for tunnel oxide passivated back-contact (TBC) solar cells. This strategy employs a graded micro/sub-micro textured pyramid structure on the illuminated front side and a nanostructured polished surface in the rear gap regions to reduce optical losses and improve visual uniformity. This approach achieved a record total-area PCE of 27.03% on a 350.0 cm² commercial-sized single-junction silicon solar cell. Furthermore, the TBC device overcomes a major drawback of BC technology – low bifaciality factor – achieving a bifaciality factor greater than 80%.
Innovations
Developed a dual-side light management strategy beneficial for enhancing optical performance, reducing optical losses, and improving overall uniformity.
Achieved a record-breaking 27.03% efficiency and an excellent bifaciality factor on a commercial-sized 350.0 cm² single-junction silicon solar cell.
Future Outlook
Setting this efficiency record at the commercial-size level provides guidance and lays the foundation for further performance breakthroughs.
The excellent visual appeal and low industrial processing losses serve as a benchmark for future market competitiveness and overall product quality.
