Implementation of Rapid Thermal Processing to Achieve Greater Than 15% Efficient Screen-Printed Ribbon Silicon Solar Cells
Date
2003-05Author
Rohatgi, Ajeet
Yelundur, Vijay
Jeong, Ji-Weon
Kim, Dong Seop
Gabor, A. M.
Metadata
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This paper summarizes our progress in fabricating record-high efficiency ribbon Si solar cells with screen-printed
and photolithography defined contacts. We have developed and optimized rapid thermal processing enhanced SiN(x)-induced hydrogenation to achieve record-high
efficiency screen-printed EFG (15.9%) and String Ribbon (15.6%) cells and a high-efficiency String Ribbon
cell (17.8%) with photolithography defined contacts. A low-frequency SiN(x) film and a two-step RTP firing process were critical in achieving high-efficiency screenprinted
cells. Step 1 provides SiN(x) induced hydrogenation and forms an aluminum doped back surface field. Step 2 is designed for Ag grid firing and includes rapid cooling to
retain hydrogen introduced in Step 1.