研究目的
Investigating high-accuracy aligning of patterning processes with each other when fabricating solar cells.
研究成果
The study successfully demonstrates two innovative alignment procedures for high-precision alignment of patterning processes in solar cell production. The methods enable accurate alignment of screen-printed contact fingers to laser-processed back surface field areas over the entire area of 6-inch solar cells, with a total structure width difference of not more than 30 μm. The approaches are applicable to both R&D and mass production, with the inline camera-based method being particularly suitable for high-throughput manufacturing.
研究不足
The study focuses on specific solar cell designs (biPERL pPassDop) and may not be directly applicable to all solar cell concepts without adaptation. The alignment procedures require high-precision equipment and may be complex to implement in some production environments.
1:Experimental Design and Method Selection:
The study introduces two approaches for aligning patterning processes in solar cell production, focusing on a laser process and a screen-printing process. The methodology involves measuring the coordinates of applied structures at discrete grid points and adjusting the laser process coordinates based on the screen-printing pattern.
2:Sample Selection and Data Sources:
The research uses 6-inch p-type Czochralski-grown silicon biPERL solar cells as samples. Reference samples with final cell patterns are fabricated and examined.
3:List of Experimental Equipment and Materials:
A pulsed infrared diode-pumped solid-state disk laser with a wavelength of 1030 nm, a high-precision offline coordinate measuring machine, and a high-resolution inline camera system are used.
4:Experimental Procedures and Operational Workflow:
The laser and screen-printing processes are applied to reference samples. The coordinates of the patterns are measured and corrected for alignment. The alignment accuracy is checked on finished solar cells.
5:Data Analysis Methods:
The coordinates of the patterns are analyzed with respect to a reference fiducial coordinate system. The alignment accuracy is evaluated through microscope images and quantitative analysis of the centerline y-offset.
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