Wave-shaped Si crystal wafers obtained by plastic deformation and preparation of their solar cells

Kazuo Nakajima; Kozo Fujiwara; Wugen Pan
December 2004
Applied Physics Letters;12/13/2004, Vol. 85 Issue 24, p5896
Academic Journal
We can prepare wave-shaped crystal wafers by the plastic deformation of Si crystal wafers, and we report on the characteristics of solar cells fabricated using the wave-shaped Si wafers, in order to demonstrate whether the shaped wafers are of high quality to be used in the preparation of devices or not. To obtain wave-shaped Si wafers, graphite dies were used. The diameter of the convex and concave waves formed in the dies is 4 mm. The Si wafers were pressed by an overload of 200 N. A thickness versus temperature region for obtaining well wave-shaped Si wafers by plastic deformation was determined. Solar cells were prepared using wave-shaped wafers pressed at 1100 and 1200 °C. The wafers were annealed at 1109 and 1209 °C, respectively, for 1 h in a hydrogen atmosphere. The conversion efficiency of the wave-shaped solar cells is 6.0%–10.1%. Thus, it is clarified that the wave-shaped wafers are of high quality to be used in the preparation of devices. The quality of the wafers can be significantly improved by suitable thermal treatments.


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