Patent ID: 8574951
Filing Date: 2013-11-05
Classification: H01L,Y02E

Abstract:
1. A process of manufacturing an interdigitated back-contact solar cell, comprising at least the following steps: (F) providing a semiconductor substrate having a micro-structure surface, forming a heavily doped N (G) performing a screen printing or spraying process to form, respectively, a second mask layer on the front side of said semiconductor substrate to cover said first N-type semiconductor layer, and to form a patterned third mask layer on the back side of said semiconductor substrate, so that the N (H) etching the interior of the semiconductor substrate by using a chemical etching solution to form a plurality of trenches in the exposed part of the N (I) removing said second and third mask layers, and then coating an antireflection layer on the front side of said semiconductor substrate; and (J) forming a P-type metal electrode and an N-type metal electrode by printing, respectively, in the trench and at a part of the area of said second N-type semiconductor layer, and then forming a P-type semiconductor layer at a part of the bottom or at the whole bottom of each trench through co-firing so that said P-type metal electrode and said N-type metal electrode both form good electrical contact with said semiconductor substrate in the fabrication of the interdigitated back-contact solar cell.