Patent ID: 7985610

Claim:
A method for forming an emitter layer for a solar cell, the method comprising: preparing a substrate including a first impurity of a first conductive type; diffusing a second impurity of a second conductive type opposite to the first conductive type in the substrate to form a first emitter portion of the emitter layer in the substrate; selectively heating a portion of the first emitter portion by at least one of laser beams to form a second emitter portion of the emitter layer which is heavily doped with the second impurity; and forming a first electrode connected to the second emitter portion, and a second electrode connected to the substrate, wherein the first electrode comprises at least one finger electrode formed along the second emitter portion and at least one bus electrode intersecting and connected to the at least one finger electrode and the first emitter portion, and wherein the forming of the first emitter portion comprises: supplying an impurity gas of the second conductive type in a diffusion furnace to diffuse an impurity included in the impurity gas in the substrate to form the first emitter portion; and generating an insulation layer including the impurity on the first emitter portion.