Method of fabricating a CIGSS solar cell

摘要

A method of fabricating solar cell is provided according to one or more embodiments. According to an embodiment, the method of fabricating solar cell includes forming a back electrode layer formed on a substrate, forming a light absorbing layer on the back electrode layer, and forming a transparent electrode layer on the light absorbing layer, wherein the light absorbing layer is comprised of copper (Cu), gallium (Ga), indium (In), sulfur (S), and selenium (Se) and includes a first concentration region in which concentrations of sulfur (S) gradually decrease in the light absorbing layer going in a first direction going from the back electrode layer toward a transparent electrode layer, and wherein the forming of the light absorbing layer comprises forming a first precursor comprised of copper (Cu), gallium (Ga) and indium (In) on the back electrode layer, forming a first compound layer by performing a first heat treatment to the first precursor using a sulfur (S) containing gas, forming a second precursor comprised of copper (Cu), gallium (Ga) and indium (In) on the first compound layer, and forming the light absorbing layer by performing a second heat treatment to the first compound layer and the second precursor using a selenium (Se) containing gas.