Patent ID: 8785218

Claim:
A solar cell system making method, comprising steps of: S 11 , making a plurality of round P-N junction preforms, wherein each of the plurality of round P-N junction preforms is made by (a) stacking a P-type silicon layer and a N-type silicon layer on top of each other, and (b) forming a P-N junction near each interface between the P-type silicon layer and the N-type silicon layer; S 12 , stacking the plurality of P-N junction preforms along a first direction and forming an electrode layer between each adjacent two of the plurality of P-N junction preforms, and electrically connecting each adjacent two of the plurality of P-N junction preforms through the electrode layer; S 13 , forming a first collection electrode on a first of the plurality of P-N junction preforms and forming a second collection electrode on a last of the plurality of P-N junction preforms to form a cylindrical solar cell system comprising a photoreceptive surface on a cylindrical surface of the cylindrical solar cell system; and S 14 , cutting the cylindrical solar cell system along the first direction and semi-diameters thereof to obtain a plurality of sectorial solar cell systems, wherein each of the plurality of sectorial solar cell systems comprises a photoreceptive surface having an arc shaped surface and two planar surfaces connecting to the arc shaped surface.