Journal
APPLIED PHYSICS LETTERS
Volume 96, Issue 1, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3284652
Keywords
carrier mobility; electrical conductivity; lanthanum compounds; organic semiconductors; semiconductor thin films; space charge
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Funding
- DAE-SRC Outstanding Research Investigator Award [2008/21/05-BRNS]
- Prospective Research Funds [2008/38/02BRNS]
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The temperature dependent current-voltage (J-V) characteristics of highly-oriented cobalt phthalocyanine films (rocking-curve width=0.11 degrees) 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 similar to V) to trap-free space-charge-limited conduction (J similar to V-2). The mobility (mu) at 300 K has a value of similar to 7 cm(2) V-1 s(-1) and obeys Arrhenius-type (ln mu similar to 1/T) behavior. However, at temperatures < 100 K, the charge transport is electrode-limited, which undergoes a bias dependent transition from Schottky (ln J similar to V-1/2) to multistep-tunneling (conductivity varying exponentially on the inverse of the square-root of electric field).
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