Laser printing of n- and p-type semiconductors for complex organic thin film transistors

With the goal to study complex organic thin film transistor (OTFT) architecture, thin films of semiconductors and of metallic materials have been laser printed. The n-type copper hexa deca fluoro phthalocyanine (F ₁₆CuPc) and p-type copper phthalocyanine (CuPc) semiconductors have been used to form the active layers. The materials have been successively transferred onto a receiver substrate by laser pulses in the picosecond regime. The latter substrate has formed the gate and the dielectric of the transistor. The three materials have been then combined in a multilayer stack prepared by the successive depositions of the materials by thermal evaporation under vacuum and then laser have been printed in a single step.