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Interaction between process technology and material quality during the processing of multicrystalline silicon solar cells
Fraunhofer ISE, Laboratory and Servicecenter Gelsenkirchen,.
Fraunhofer ISE, Laboratory and Servicecenter Gelsenkirchen,.ORCID iD: 0000-0003-2181-3820
2009 (English)In: Journal of materials science. Materials in electronics, ISSN 0957-4522, E-ISSN 1573-482X, Vol. 20, no 1, p. 487-492Article in journal (Refereed) Published
Abstract [en]

Multicrystalline silicon is the most used materialfor the production of silicon solar cells. The quality of the asgrown material depends on the quality of the feedstock andthe crystallization process. Bulk impurities, crystal defectslike dislocations and of course the grain boundaries determinethe material quality and thus the solar cell conversionefficiency. Therefore minority carrier lifetime measurementsare often done to characterize the material quality. Butthe measured values are from limited use because it is knownthat the solar cell process itself can dramatically change theminority carrier lifetime and the solar cell efficiency. In orderto obtain more detailed information of the behaviour ofdifferent defect types additionally high-resolution LBIC(light beam induced current)-measurements have been done.Since LBIC needs a pn-junction for photocurrent generationthe LBIC technique has been combined with the a-Si/c-Siheterojunction cell process, which makes it possible tomanufacture solar cells even from as cut wafers withoutchanging the material quality. With this combination ofmeasurement and preparation techniques it was possible toanalyze the influence of the diffusion process and the firingprocess on the behaviour of the three different defect types: grain boundaries, dislocation networks and bulk impurities.

Place, publisher, year, edition, pages
2009. Vol. 20, no 1, p. 487-492
Keywords [en]
silicon solar cell process heterojunction LBIC gettering
National Category
Condensed Matter Physics
Research subject
Physics
Identifiers
URN: urn:nbn:se:kau:diva-27902DOI: 10.1007/s10854-008-9687-0OAI: oai:DiVA.org:kau-27902DiVA, id: diva2:628892
Available from: 2013-06-14 Created: 2013-06-14 Last updated: 2017-12-06Bibliographically approved

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