D Krautz et al 2009 Nanotechnology 20 275204 doi:10.1088/0957-4484/20/27/275204
D Krautz1, S Cheylan1, D S Ghosh1 and V Pruneri1,2
Show affiliationsWe report on the possibility of using a thin Ni layer, instead of ITO, as a semitransparent hole-injecting electrode for bottom polymer LEDs. Thin metal layers of Ni were deposited by a sputtering technique and their electrical and optical properties with different deposition times have been investigated. Both square resistance and transmittance were seen to decrease with deposition time (thickness). The films showed a transmittance of around 30–40%, which is quite low compared to the 86% of ITO, while their square resistance was higher than that of ITO. Nevertheless, diodes based on a blue emitting polymer, polyfluorene (PFO), showed the same efficiency for either ITO or thin Ni electrodes, although the Ni transmittance is around 2.5 times lower than the ITO transmittance. Such preliminary results definitively suggest that indium-free organic devices can be achieved.
81.15.Cd Deposition by sputtering
78.66.Bz Metals and metallic alloys
73.61.At Metal and metallic alloys
78.20.-e Optical properties of bulk materials and thin films
Condensed matter: electrical, magnetic and optical
Surfaces, interfaces and thin films
Issue 27 (8 July 2009)
Received 3 April 2009, in final form 5 May 2009
Published 16 June 2009
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