NOVELTY - A solar cell module comprises a back electrode layer (200) on support substrate (100); light absorbing layer (300) on the back electrode layer; first buffer layer (400) on the light absorbing layer; a second buffer layer (500) on the first buffer layer; and a front electrode layer (600) on the second buffer layer.    USE - As solar cell module (claimed).    ADVANTAGE - The second buffer layer is formed between the first buffer layer and the front electrode layer, which reduces the damage and pin holes, which may be generated in the first buffer layer in the process of forming the front electrode layer, and prevents the shunt to increase the open-circuit voltage Voc. In addition, the bandgap energy (Eg) of the second buffer layer has the intermediate value between the bandgap energy of the first buffer layer and the bandgap energy of the front electrode layer. Thus, the bandgap of the second buffer layer can be aligned with the bandgaps of adjacent layers, so the recombination of the electron-hole can be minimized and the photoelectric conversion efficiency can be improved.    DETAILED DESCRIPTION - A solar cell module comprises a back electrode layer (200) on support substrate (100); light absorbing layer (300) on the back electrode layer; first buffer layer (400) on the light absorbing layer; a second buffer layer (500) on the first buffer layer and expressed as Zn1-yMgyO; and a front electrode layer (600) on the second buffer layer.    y=0.15-0.25.    An INDEPENDENT CLAIM is included for method of fabricating a solar cell module involving forming a back electrode layer on a support substrate; forming a light absorbing layer on the back electrode layer; forming a first buffer layer on the light absorbing layer; forming a second buffer layer on the first buffer layer; and forming a front electrode layer on the second buffer layer.    DESCRIPTION OF DRAWING(S) - The figure shows a sectional view of a solar cell module.    Support substrate (100)    Back electrode layer (200)    Light absorbing layer (300)    First buffer layer (400)    Second buffer layer (500)    Front electrode layer (600)