R. Punla, A. Intaniwet, S. Choopun, and P. . Ruankham, “USING Cu2O CuO AND PEDOT: PSS HOLE TRANSPORTING DOUBLE LAYERS FOR DEVELOP PEROVSKITE SOLAR CELLS”, Life Sci. Environ. J., vol. 21, no. 2, pp. 374–384, Sep. 2020.