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

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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∝V l+1, where l=T c/T, T c is the characteristic temperature of traps distribution. A characteristic trap depth (E 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.