Influence of Electrical, Chemical and Morphological Properties of Inorganic/Organic Interface on Light Emitting Devices Performance

Abstract

Abstract studies on the influence of chemical and physical treatments on the properties of indium–tin oxide (ITO) thin films are reported. The ITO films are utilized as transparent anodes of organic light‐emitting diodes (OLEDs) incorporating poly(9,9‐dihexyl‐9H‐fluorene‐2,7‐diyl) (PF6) as the hole transporter material and 8‐hydroxyquinoline aluminum salt (Alq3) as emitter material. Chemical (HCl, piranha solutions), thermal (vacuum annealing), physical treatments (oxygen plasma, UV ozone) and combined treatments are studied. First, ITO layers with different treatments are characterized by using four point probe method, contact angle measurement, X‐Ray diffraction (XRD), surface profilometer, scanning electron microscopy (SEM), UV‐Vis‐IR transmittance. Later, electrical and optical properties of OLEDs with treated ITO as anode are extensively investigated.