US 2002/0153039 A1 · Solar cell and method for fabricating the same

Abstract

A technique for fabricating a solar cell includes an n+ emitter region first being formed on a front surface of the cell, and then front and rear insulating layers being formed on both sides of the cell. P (Phosphorus)-source and B (Boron)-source are printed on the front and rear insulating layers, respectively, and then both dopants are diffused into the cell at high temperature. Therefore, n++ region in the front side of the cell and BSF (back surface field) region in the rear side of the cell is formed. Front and rear contact patterns are formed on the front and rear insulating layers, respectively. The n+ region and BSF region are exposed after front and rear contacts are formed on the front and rear insulating layers, respectively. The front and rear contacts contact the n++ region and BSF region, respectively.

Claims20

Dependent claims

A method for fabricating a solar cell, comprising the steps of:

forming a shallow emitter layer on a front surface of a substrate;
forming passivation, SiO2 layers on both front and rear surfaces of said substrate;
printing dopant sources on both front for heavy emitter layers and rear for back surface field layers on the passivation layers, respectively;
diffusing said dopant sources into the substrate to accommodate the forming of heavily doped emitter layers and back surface field layers;
and
forming the front and rear contact patterns on insulating layers in chemical etching solution on the front and rear insulating layers, respectively, to accommodate the heavy emitter layers and back surface field layers being exposed.

3 more elements

Dependencies are inferred from the claim text.

Solar cell and method for fabricating the same

Life of this patent

Solar cell and method for fabricating the same

Life of this patent

Abstract

Claims20