Self-assembly growth and electron work function of copper phthalocyanine films on indium tin oxide glass

► Growth and work function of copper phthalocyanine films on ITO were investigated. ► α-form crystalline CuPc films with well order were obtained. ► The decrease of the EWF with the increase of film thickness was observed. ► The evolution of the EWF was associated with the changes of surface morphology and electronic behaviors.