| 摘要 |
PURPOSE:To obtain a solar cell maintaining high electromotive efficiency by constructing a solar cell whose one part of the surface layer is intruding into the base layer. CONSTITUTION:The P-layer 1 of a solar cell 100 as a base layer is thicker than the N-layer 2 as a surface layer. A P-electrode 4 and an N-electrode 5 are provided on the P-layer 1 and the N-layer 2 respectively. A shallow, lattice- shaped groove 8 is arranged on the junction plane 3' of the P-layer 1, and a quadrangular pyramid-shaped dent section 9 ranging over 70-90% of the thickness of the base layer 1 is arranged in the lower section of the cross-section of the shallow groove 8. The shallow bank 10 and the dent 9 of the N-layer 2 correspond to the shallow groove 8 and the convex section 9. A junction section 3 intrudes into the inside of the P-layer 1 at plural parts. Thus, a free carrier 6, even if it is generated in a deeper place A7 than the N-layer 2, securely reaches the PN junction section 3 within the lifetime of it since the distance X from the junction section 3 is smaller. Thus, the solar cell 100 possesses superior electromotive efficiency. |
