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.
ASJC Scopus subject areas
- Physics and Astronomy (miscellaneous)