Title:	Laser Cutting of Solar Cells by Using the Stress Cut Approach
Author(s):	S. Krause, S. Hensel, M. Meusel, S. Eiternick, M. Turek
Keywords:	Lock-in Thermography, Heterojunction Solar Cells, Efficiency Analysis, Laser Separation
Topic:	Silicon Materials and Cells
Subtopic:	Feedstock, Crystallisation, Wafering, Defect Engineering
Event:	38th European Photovoltaic Solar Energy Conference and Exhibition
Session:	2EO.3.3
Pages:	204 - 207
ISBN:	3-936338-78-7
Paper DOI:	10.4229/EUPVSEC20212021-2EO.3.3
Price:	0,00 EUR
Document(s):	paper, presentation

Abstract/Summary:

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Half-cell modules have entered the mass production market as one route to high-efficiency PV modules with reduced costs. Recent developments such as shingled modules also require reliable solar cell separation processes on a broad variety of solar cell technologies. In this work, we present a new “stress-cut” laser process that leads to optimized laser processing and reduced cell damages. It can be implemented for either ablative or non-ablative processes. Key element of the stress-cut is the laser treatment of a slightly bent solar cell which results in an automatic, intrinsic optimization of the cell separation process. We show, that for both PERC and heterojunction solar cells, welloptimized cell separation is achieved. Furthermore, results are presented showing that our stress-cut approach can be universally applied and transferred to a wide range of laser sources. Going beyond the half-cell layout, it is finally shown that the “stress-cut” process can also be applied to manufacture solar cell stripes for shingled modules.