Temperature Effect on Current–Voltage Characteristics of Molecular Organic Tris(8-hydroxyquinoline) Aluminium Complex

概要

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The temperature effect on the electron transport in organic semiconducting molecule tris(8-hydroxyquinoline) aluminium (Alq3) diodes has been investigated. The current–voltage ($J$–$V$) characteristics have been measured in single layer electron only devices with Alq3 sandwitched between two aluminium electrodes. $J$–$V$ characteristics have been studied at different temperatures from 295 to 83 K. At high-applied bias and temperatures from 295 to 219 K, our experimental data fits well to the theory where charge transport is determined by exponential traps and $J\propto V^{l+1}$, where $l=T_{\text{c}}/T$, $T_{\text{c}}$ is the characteristic temperature of traps distribution. A characteristic trap depth ($E_{\text{t}}$) of 0.19 eV, has been obtained by a temperature dependent analysis of $J$–$V$ characteristics. However it was not possible to fit the low temperature data below 219 K, with exponential trap theory, without some unacceptable changes. A numerical analysis of mobility model, in which the mobility has field and temperature dependence, has been found in a good agreement to the data below 219 K.
Published by the Japan Society of Applied Physics through the Institute of Pure and Applied Physicsの論文
2006-10-15