Optoelectronic behaviour of zinc phthalocyanines doped with anthraquinone derivatives and their potential use in flexible devices

ABSTRACT

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 × 10⁻¹¹ S^/cm to 10 × 10⁻¹¹ S/cm and 3 × 10⁻¹¹ S/cm to 8 × 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 bandgap E_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.

KEYWORDS:

• Doped semiconductor
• flexible device
• electrical properties
• annealing
• optical properties

Acknowledgments

The authors wish to thank the technical assistance of Hector Jair Maldonado Ramirez and Q. A. Martín A. Hernández Landaverde.

Disclosure statement

No potential conflict of interest was reported by the authors.

Additional information

Funding

M.E. Sánchez-Vergara acknowledges financial support from Universidad Anahuac México, project number [NNAIASEVM16070616].