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1、Advanced Hybrid Silicon Solar Cells Dr. Guoxiao Yao CTO of Tianwei Yingli New Energy Resources Co. 姚国晓博士 首席技术官 中国天威英利新能源有限公司 2007年5月10日,2007 SNEC International Solar & PV Conference,Features of Metallization for Screen Printing Silicon Solar Cells Features of Metallization for Buried Contact Silicon
2、 Solar Cells Features of Metallization for Hybrid Silicon Solar Cells Processing Technology of Metal Stencils Laser-Processed Single-Level & Double-Level Stainless Steel Stencil Performance of Hybrid Silicon Solar Cells Conclusions,Contents,Advantages: Good availability of screen printing machine Re
3、latively lower height-to-width aspect ratio (0.06), leading to higher resistive loss, lower FF. Lower opening percentage (40%) of screen & gradual degradation of printing lines with the wear and tear of the emulsion layer.,Features of Metallization for Screen Printing Solar Cells,rear metal contact,
4、2-3 mm,150 um,Figure 1: The structure of screen printing solar cells,Advantages: Very fine top finger width (25 um), leading to lower shading loss (3%); Pretty high height-to-width aspect ratio (as high as 5), leading to lower resistive losses, higher FF; Lower contact resistance, further reducing t
5、he resistive loses, increasing FF. Disadvantages: Much longer metallization process; Consuming more wet chemicals, less environmentally friendly.,Figure 2: The structure of buried contact solar cells,Features of Metallization for Buried Contact Solar Cells,Figure 3: Schematic of a hybrid silicon sol
6、ar cell structure,A hybrid solar cell incorporates some of the advantages of buried contact and screen printing technologies,Advantages: Relatively fine top finger width (50 um), leading to lower shading loss (6%); Relatively high height-to-width aspect ratio (0.5), leading to lower resistive losses
7、, higher FF; Simplicity of processing sequence. Disadvantages: Mask manufacturing process complicated ,Features of Metallization for Hybrid Solar Cells,Mask fabrication Pattern alignment,Key Techniques,Aperture Profile:,Gaussian beam profile:,Metal Stencil Fabrication,Metal Stencil Fabrication,Finis
8、hed stencil,Single-Level Stainless Steel Stencil,a stencil-printed finger & busbar,68 m (W) x 24 m (H) finger profile,Profile of Printed Lines,Double-Level Stainless Steel Stencil,Printed Finger,Printed Busbar,Single-Level Stencil Printing,Double-Level Stencil Printing,Printing Comparison,Figure 25:
9、 (a) The grooves just after laser scribing shows some islands; (b) the clean grooves after laser scribing and chemical etching.,Features & Formation of the Grooves,Alignment,2. Indicate 8 alignment points using the laser vision system,Put a pic about laser box,Alignment,3. Calculate the translation
10、and rotation with respect to the print nest,Alignment,4. Translate and rotate the groove scribe pattern using software,Alignment,5. Laser scriber now registered to the stencil print nest,Alignment,Alignment,Finger Profile: 50 m wide & 22 m high,Busbar Profile: 230 m wide & 22 m high,Stencil Printed
11、Finger & Busbar,Cell Results & Best Cell I-V Curve,Cell Results & Best Cell I-V Curve,Quantum Efficiency of the Best Cell,Laser cutting and chemical etching suitable for stencil fabrication Both single- & double-level structured stencils have been fabricated. Double-level stencils allow grid pattern
12、s to be printed with high quality in one step. Finger profiles of 50-m wide and 22-m high, in grooves, have been demonstrated A novel alignment method enables selective emitter cell structure, with good matching Best solar cell has a fill factor of 0.77 and efficiency of 16.4% with excellent IQE at short wavelengths (1 ohm-cm, CZ, textured),Conclusion,Thanks for your attention,Yingli SolarDriving the Future,
