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Solution processed SnO2:Sb transparent conductive oxide as alternative to Indium Tin Oxide for applications in Organic Light Emitting Diodes

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<mark>Journal publication date</mark>28/04/2016
<mark>Journal</mark>Journal of Materials Chemistry C
Issue number16
Number of pages8
Pages (from-to)3563-3570
Publication StatusPublished
Early online date16/03/16
<mark>Original language</mark>English


Here we present the deposition of antimony-doped tin oxide thin films using the ambient spray pyrolysis technique and demonstrate their implementation as transparent electrodes (anodes) in red, green and blue Organic Light emitting diodes. The films were spray coated at 380 oC from SnCl4 and SbCl3 solution blends in methanol and ∼230 nm thick films were investigated by means of x-ray diffraction, AFM, UV-Vis absorption spectroscopy, 4-point probe, Hall Effect and Kelvin Probe. It was found that for optimum antimony doping in the precursor solution of ∼2 wt%, the as-deposited ATO films exhibit excellent characteristics such as low surface roughness of RRMS∼6.3 nm, high work function (∼ -5.03 eV), wide direct band gap (∼4.2 eV), high transparency in the visible spectrum in excess of 85 % on glass, low sheet resistivity (∼32 Ohms/sq), high charge carrier concentration (∼6.35 × 10^20 cm-3) and carrier mobility of ∼32 cm2 V-1 s-1. Furthermore, the electrical and optical performance i.e. the turn on voltage and external quantum efficiency of red, green and blue OLEDs fabricated on optimized SnO2:Sb films were identical to those of OLEDs fabricated on commercially available ITO (Rs∼15 Ohms/sq) and were found to be in excess of 11 %, 0.3 % and 13 % for red, green and blue OLEDs respectively