Electrical properties of hybrid phthalocyanines thin films using gold and lead electrodes
Thin Film Lab., School of Pure and Applied Physics, Mahatma Gandhi University, 686 560 Kottayam, Kerala State, India
Corresponding author: a email@example.com
Revised: 6 June 2005
Published online: 17 November 2005
The electrical properties of mixed copper phthalocyanine (CuPc) and nickel phthalocyanine (NiPc) thin films devices with gold and lead electrodes have been investigated. The two phthalocyanines were co-evaporated and deposited on to a pre-cleaned glass substrate by thermal evaporation technique at room temperature. By the co-sublimation technique an integrated phthalocyanine sample was prepared. At low voltages the film showed an ohmic conduction whereas at higher voltage levels the conduction mechanisms were dominated by space charged limited conduction (SCLC). The value of mobility of holes were calculated as m2 V-1 s-1 which is lower for the mixed phthalocyanines whereas the trap concentrations m-3 have increased in the SCLC region. Further the reverse conduction mechanisms have also been investigated. From the current limitations in the reverse condition a strong rectifying behaviour was evident.
PACS: 73.61.-r – Electrical properties of specific thin films / 78.20.-e – Optical properties of bulk materials and thin films
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2005