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Optimisation of laser scribing of back contact for photovoltaic modules
2005 (English)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

Thin film technology offers a promising development toward more economic solar electricity. A key step in thin-film module production is the isolative laser scribing of metal back contact layers on glass substrates. Successful scribing yields reproducible, clean scribes without buckling, ridges or collars on the scribe edges. It is also desirable that scribes are narrow, to minimise loss of active solar cell area, and that they can be processed rapidly. During this investigation laser scribing of a Mo back contact layer for solar module production has been considered for optimisation. The laser system used is a lamp-pumped, green solid-state Nd:YAG laser, operating at 532nm output wavelength. This system has been characterized in order to determine the output energy, laser spot size and average energy density. Scribing results have been evaluated qualitatively for different laser parameters. Furthermore, scribing has been evaluated on Mo that has been deposited under different conditions. Using a double lens configuration has been evaluated for the possibility of, by simple optical manipulation, affecting the scribe quality and width. Using the results from the qualitative investigation of laser scribing a standard process for module fabrication has been established, providing clean, reproducible scribes with little or no buckling of the scribe edges. It has also been shown that these laser scribing parameters yielded good results across a range of Mo sputtered under different pressures. Finally it has been shown that the scribe width can be reduced, in this case from 70µm to 50µm, using the double lens configuration.

Place, publisher, year, edition, pages
Keyword [en]
Technology, photovoltaics, laser scribing, thin-film technology
Keyword [sv]
URN: urn:nbn:se:ltu:diva-58897ISRN: LTU-EX--05/102--SELocal ID: f747c531-d55a-495a-8553-c88a695998ceOAI: diva2:1032285
Subject / course
Student thesis, at least 30 credits
Educational program
Materials Engineering, master's level
Validerat; 20101217 (root)Available from: 2016-10-04 Created: 2016-10-04Bibliographically approved

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