Patent ID: 8053343

Claim:
A method for forming a selective emitter of a solar cell, the method comprising: texturing a surface of a silicon substrate by etching the silicon substrate; coating an impurity solution on the surface of the silicon substrate; injecting a first thermal energy into the whole surface of the silicon substrate coated with the impurity solution; and while the first thermal energy is injected into the whole surface of the silicon substrate, injecting a second thermal energy by irradiating a laser beam into a partial region of the surface of the silicon substrate coated with the impurity solution, wherein impurity ions are diffused into the silicon substrate by the first thermal energy and thus an emitter layer is resultantly formed, and the impurity ions are more diffused into a partial region of the emitter layer by the second thermal energy and thus a selective emitter region is resultantly formed, and wherein the second thermal energy comprises a third thermal energy due to the laser beam and the first thermal energy, and a temperature by the second thermal energy is equal to a temperature by the first thermal energy and the third thermal energy.