Author(s) |
Samanta, S.; Aswal, D. K.; Singh, A.; Debnath, A. K.; Kumar, M. S.; Hayakawa, Y.; Gupta, S. K.; Yakhmi, J. V. |
The temperature dependent current-voltage (J-V) characteristics of highly-oriented cobalt phthalocyanine films (rocking-curve width=0.11°) deposited on (001)
LaAlO3 substrates are investigated. In the temperature range 300-100 K, charge transport is governed by bulk-limited processes with a bias dependent crossover from Ohmic
(J ~ V) to trap-free space-charge-limited conduction (J
~ V2). The mobility (µ) at 300 K has a value of ~ 7
cm2 V-1 s-1 and obeys Arrhenius-type
(ln µ ~ 1/T) behavior. However, at temperatures < 100 K, the charge transport is electrode-limited, which undergoes a bias dependent transition from Schottky
(ln J ~ V1/2) to multistep-tunneling (conductivity varying exponentially on the inverse of the square-root of electric field). |