Observation of persistent photoconductivity in vanadyl phthalocyanine

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Santos, L. F.
Faria, R. M.
Del Cano, T.
de Saja, J. A.
Constantino, C. J. L. [UNESP]
Amorim, C. A.
Mergulhao, S.
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Iop Publishing Ltd
Persistent photoconductivity (PPC) in vanadyl phthalocyanine (VOPc) organic light-emitting diodes was investigated using photoconductive time response, photocurrent-voltage characteristics and charge extraction in linearly increasing voltage (CELIV) measurements. The experiments were performed in phase 1 (amorphous) and in phase 2 (crystalline) samples obtained by the physical vapour deposition (PVD) technique over ITO/glass electrodes with an Al covering electrode. The results indicated a photoconductivity with a long decay time in phase 1 VOPc described by a stretched exponential relaxation. The device showed a rectifying behaviour and the mobility of holes was measured by CELIV, following a dispersive model. In crystalline samples the PPC effect was not observed and the dominant mechanism of transport of holes was hopping in a Gaussian density of states.
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Journal of Physics D-applied Physics. Bristol: Iop Publishing Ltd, v. 41, n. 12, p. 7, 2008.