Niepelt, R.; Hensen, J.; Steckenreiter, V.; Brendel, R.; Kajari-Schröder, S.: Kerfless exfoliated thin crystalline Si wafers with Al metallization layers for solar cells. In: Journal of Materials Research 30 (2015), Nr. 21, S. 3227-3240. DOI:
https://doi.org/10.1557/jmr.2015.309
Abstract: |
We report on a kerfless exfoliation approach to further reduce the costs of crystalline silicon photovoltaics making use of evaporated Al as a double functional layer. The Al serves as the stress inducing element to drive the exfoliation process and can be maintained as a rear contacting layer in the solar cell after exfoliation. The 50-70 μm thick exfoliated Si layers show effective minority carrier lifetimes around 180 μs with diffusion lengths of 10 times the layer thickness. We analyze the thermo-mechanical properties of the Al layer by x-ray diffraction analysis and investigate its influence on the exfoliation process. We evaluate the approach for the implementation into solar cell production by determining processing limits and estimating cost advantages of a possible solar cell design route. The Al-Si bilayers are mechanically stable under processing conditions and exhibit a moderate cost savings potential of 3-36% compared to other c-Si cell concepts. © Materials Research Society 2015.
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License of this version: |
Es gilt deutsches Urheberrecht. Das Dokument darf zum eigenen Gebrauch kostenfrei genutzt, aber nicht im Internet bereitgestellt oder an Außenstehende weitergegeben werden. Dieser Beitrag ist aufgrund einer (DFG-geförderten) Allianz- bzw. Nationallizenz frei zugänglich. |
Publication type: |
Article |
Publishing status: |
publishedVersion |
Publication date: |
2015 |
Keywords english: |
Si, thermal stresses, x-ray diffraction (XRD), Aluminum, Biomechanics, Costs, Crystalline materials, Silicon, Silicon solar cells, Silicon wafers, Thermal stress, X ray diffraction, X ray diffraction analysis, Crystalline Si wafers, Crystalline silicons, Exfoliation process, Mechanically stable, Minority carrier lifetimes, Processing condition, Solar cell design, Thermomechanical properties, Solar cells
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DDC: |
620 | Ingenieurwissenschaften und Maschinenbau
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