https://doi.org/10.1140/epjb/e2005-00352-7
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 wilsonacv@sancharnet.in
Received:
15
November
2004
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