Abstract
In:ZnO (IZO) thin films were deposited on flexible plastic substrates by pulsed laser deposition (PLD) method. The obtained layers present adequate optical and electrical properties competitive with those based on indium tin oxide (ITO). The figure of merit (9 × 10−3 Ω−1) calculated for IZO layers demonstrates that high quality coatings can be prepared by this deposition technique. A thermal annealing (150 °C for 1 h) or an oxygen plasma etching (6 mbar for 10 min.) were applied to the IZO layers to evaluate the influence of these treatments on the properties of the transparent coatings. Using vacuum evaporation, organic heterostructures based on cooper phthalocyanine (CuPc) and 3,4,9,10-perylenetetracarboxylic dianhydride (PTCDA) were deposited on the untreated and treated IZO layers. The optical and electrical properties of the heterostructures were investigated by UV–Vis, FTIR and current–voltage (I–V) measurements. For the heterostructure fabricated on IZO treated in oxygen plasma, an improvement in the current value with at least one order of magnitude was evidenced in the I–V characteristics recorded in dark conditions. Also, an increase in the current value for the heterostructure deposited on untreated IZO layer can be achieved by adding an organic layer such as tris-8-hydroxyquinoline aluminium (Alq3).
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Acknowledgements
This research was financially supported by the Romanian Ministry of Education and Research through National Core Founding Program, contract PN16-480102, by Bilateral contract no. 783/2014 and from contract PN-II-ID-PCE-2012-4-0467.
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The authors M. Socol and C. Breazu contributed equally to this work.
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Socol, M., Preda, N., Stanculescu, A. et al. IZO deposited by PLD on flexible substrate for organic heterostructures. Appl. Phys. A 123, 371 (2017). https://doi.org/10.1007/s00339-017-0992-4
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DOI: https://doi.org/10.1007/s00339-017-0992-4