A non-acidic material as a hole transport layer for optoelectronic device applications Eman Hussien and Peter Skabara School of Chemistry, University of Glasgow, Glasgow G12 8QQ, UK π-Conjugated polymers, such as poly(3,4-ethylenedioxythiophene):poly(styrene sulfonic acid) (PEDOT:PSS), are attractive due to their high conductivity, transparency (80-87%), and easy solution processing. PEDOT:PSS is considered as an effective hole-transporting material due to its smooth surface. These properties allow it to be used in various applications in optoelectronic devices such as organic photovoltaics (OPVs) and organic light- emitting diodes (OLEDs). Despite all of these attractive properties of PEDOT:PSS, several technical drawbacks limit its use, such as acidity, hygroscopicity, active layer wetting and indium tin oxide (ITO) corrosion leading to reduced device performance, efficiency and lifetime. 1,2 The main objective of the current study is to develop a non-acidic conjugated material that can be simply fabricated in optoelectronic devices as an HTL as a promising alternative to the PEDOT:PSS. Electrochemical deposition technique was used to form a transparent blue thin film which was characterised by cyclic voltammetry (CV), UV-Vis spectroscopy, spectroelectrochemistry, NMR spectroscopy and mass spectrometry analysis. Also, the film morphology was characterised by atomic force spectroscopy (AFM). The resulting materialdisplayed high conductivity at a low oxidation potential of 0.15 V in dichloromethane. UV-Vis spectroscopy showed a bathochromic shift at λ max =600 nm and an optical band gap of 1.41 eV. These resulted properties suggest that our material may be suitable for OLED devices which are currently under investigation. References 1. J. Cameron and P. J. Skabara, Materials Horizons , 2020, 7 , 1759-1772. 2. M. P. d. Jong, L. J. v. IJzendoorn and M. J. A. d. Voigt, Applied Physics Letters , 2000, 77 , 2255-2257.
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