Method of manufacturing solar cell

摘要

A method of manufacturing a solar cell having increased light efficiency due to increased gallium distribution on a surface of a light absorption layer, the method including forming a first electrode on a substrate, forming a precursor that includes at least one of copper, gallium, and indium on the first electrode, forming a preliminary light absorption layer by providing selenium to the precursor, forming the preliminary light absorption layer further including performing a heat treatment, and forming a liquid state CuSe compound, forming a light absorption layer by providing a compound including at least one of gallium and indium to the preliminary light absorption layer, and forming a second electrode on the light absorption layer.

主权项

1. A method of manufacturing a solar cell, the method comprising:
forming a first electrode on a substrate; forming a precursor on the first electrode, wherein the precursor includes:
a first layer that includes a CuGa compound or a CuIn compound on the first electrode, anda second layer that includes gallium or indium on the first layer,wherein a composition ratio of copper/(gallium+indium) in the precursor is 1 or more; heating the precursor while adding selenium to form a preliminary light absorption layer including a Cu, In, Ga, Se compound and liquid CuSe; continuing the heating while adding selenium and while adjusting the composition ratio of copper/(gallium+indium) to be about 1 or less by providing a compound including at least one of gallium and indium to the liquid CuSe in the preliminary light absorption layer to form a light absorption layer; and forming a second electrode on the light absorption layer.