| 摘要 |
A rear contact heterojunction solar cell 1 in which openings in the separation layer 9 have tapered sidewalls (a,b,c figure 3) in which the emitter 13 and base 19 p/n layers & electrodes 15, 21 are arranged. The solar cell comprises a silicon substrate 3 having a passivation layer 5 at its front surface, and an intrinsic amorphous silicon layer 7 covering its rear surface. At a back side of the intrinsic amorphous silicon layer 7, an emitter layer 13 and a base layer 19 are provided, each of these layers covering neighboring partial areas of the back surface. Interposed between these emitter and base layers 13, 19 is a separation layer 9 comprising an electrically insulating material. This separation layer 9 as well as the base layer 19 and emitter layer 13 may be generated by vapor depositing through a mask. Due to such processing, adjacent regions of the emitter layer 13 and the separating layer 9 and adjacent regions of the base layer 19 and the separating layer 9 partially laterally overlap in overlapping areas 23, 25 in such a way that at least a part of the separating layer 9 is located closer to the substrate 3 than an overlapping portion of the respective one of the emitter layer 13 and the base layer 19. With the proposed solar cell concept and fabricating method, high solar cell efficiencies may be obtained at low fabrication costs due to a possible high quality surface passivation. |
