Patent ID: 8987588
Filing Date: 2015-03-24
Classification: H01L,Y02E,Y02P

Abstract:
1. A method for fabricating a solar cell, comprising: providing a substrate, wherein the substrate has a first surface and a second surface disposed opposite to the first surface; forming a first patterned doped stacked structure on the second surface of the substrate, and the first patterned doped stacked structure exposing a portion of the second surface of the substrate so as to form at least one first shielded region and at least one first exposed region, wherein the first exposed region has a first dimension, the first patterned doped stacked structure comprises a first dielectric layer, a first doped layer and a second dielectric layer, wherein the first dielectric layer, the first doped layer and the second dielectric layer are mutually stacked, the first doped layer comprises a plurality of first dopants of a first doped type, the first doped layer is disposed between the first dielectric layer and the second dielectric layer, the first dielectric layer has an opening, and the first doped layer contacts the second surface of the substrate through the opening; forming a second doped layer covering on the first patterned doped stacked structure and the second surface of the substrate, wherein the second doped layer contacts the second surface exposed within the first exposed region, and the second doped layer comprises a plurality of second dopants of a second doped type opposite to the first doped type; performing a thermal process to make the first dopants of the first doped layer diffuse into the second surface of the substrate so as to form a first lightly-doped region and a first heavily-doped region in the first shielded region, and to make the second dopants of the second doped layer diffuse into the second surface of the substrate so as to form a second heavily-doped region in at least a portion of the first exposed region; removing a portion of the first patterned doped stacked structure so as to form a first contact opening exposing the first heavily-doped region, and removing a portion of the second doped layer so as to form a second contact opening exposing the second heavily-doped region; and forming a first electrode in the first contact opening, wherein the first electrode is electrically connected to the first heavily-doped region, and forming a second electrode in the second contact opening, wherein the second electrode is electrically connected to the second heavily-doped region.