Electron transport and tunnelling spectroscopy in alkali doped metal phthalocyanines

We discuss electrical transport measurements performed on thin films of four different metal phthalocyanines doped with Potassium atoms. The temperature dependence of the conductivity shows that a metallic state occurs on a wide range of doping concentrations for all the four molecules. The occurence of the metallic state is confirmed by scanning tunneling spectroscopy. Key words. Metal phthalocyanine – band filling – metal – insulator transition