Optoelectronic Behaviour Of Zinc Phthalocyanines Doped With Anthraquinone Derivatives And Their Potential Use In Flexible Devices

Zinc phthalocyanine (ZnPc) was doped with 1,4-diaminoanthraquinone, anthraflavic acid and 2-ethylanthraquinone. The organic semiconductors obtained were used in the manufacture of thin films, which were characterized . Films were used to prepare (PET/ITO/doped ZnPc/Ag) flexible devices, whose electric conductivity was evaluated as a function of temperature; some of the devices show a considerable increase in their activity up to values of around 2 x 10(-11) S(/)cm to 10 x 10(-11) S/cm and 3 x 10(-11) S/cm to 8 x 10(-11) S/cm for 0.5 and 1.0 V, respectively. Absorbance, Q-band, B-band and optical activation energy were also evaluated by ultraviolet-visible spectroscopy. Optical bandgapE(g)(opt)values calculated for the semiconductors have a value of around 1.35 eV. The semiconductor devices were annealed in accelerated time and temperature conditions and their optical activation energy was later re-evaluated. The films exhibit two transitions; the first transition corresponds to the optical bandgap,E-g(opt), and the second one to the fundamental gap,E-g.