Modification of charge transport in triphenyldiamine films induced by acid oxidized single-walled carbon nanotube interlayers

Abstract

We report the modification of the transport, optical and electrical properties of 200 nm thick N,N'-diphenyl-N,N'-bis(3-methylphenyl)-1,1'biphenyl-4,4'diamine (TPD) films on indium-tin oxide (ITO) when a low density of acid oxidized single-walled carbon nanotubes (o-SWCNTs) are present at the ITO/TPD interface. Most significantly, current-voltage measurements show strong evidence for a change from contact to bulk limited transport. We postulate that these observations result from a change in the structure of the TPD film seeded by the presence of o-SWCNTs at the ITO surface.

Solution-processable graphene oxide as an efficient hole injection layer for high luminance organic light-emitting diodes

“…8 Other strategies for hole injection have been attempted based on nano-carbon electrodes with limited success. [9][10][11] In comparison, a solution-processable and efficient hole-injecting material such as graphene oxide (GO) that can replace PEDOT:PSS is highly desirable, and has the potential of being cheap and exible ITO-free electrodes in organic optoelectronics.…”

High luminance organic light-emitting diodes with efficient multi-walled carbon nanotube hole injectors

“…OLEDs and organic photovoltaics (OPVs) [15][16][17][18]. Currently, a large quantity of effort has been expended in the field of applications of SWCNTs to OLEDs because of their higher conductivity [15,16,[19][20][21], but less so to MWCNTs. MWCNTs are easier to process than SWCNTs, because they are less prone to forming tight bundles and are significantly more inexpensive.…”

“…OLEDs and organic photovoltaics (OPVs) [15][16][17][18]. Currently, a large quantity of effort has been expended in the field of applications of SWCNTs to OLEDs because of their higher conductivity [15,16,[19][20][21], but less so to MWCNTs.…”

“…A further alternative is offered by carbon nanotubes (CNTs), including single-walled (SW) and multi-walled (MW). This is due to their remarkable properties, including high electrical conductivity, mechanical strength, excellent chemical stability and tunable work function (4.5-5.1 eV) [15]. Another aspect less considered is their excellent thermal conductivity, particularly when operating under high bias conditions.…”

Carbon nanotube modified electrodes for enhanced brightness in organic light emitting devices

“…For better hole and electron injection, further research is focussed on incorporating single wall (SW) and multiwall (MW) carbon nanotubes (CNT) [5][6][7][8]. CNT have been introduced into the OLED structures in the form of composites [9] or as a single layer from a solution functionalised CNT spin coated on to the top of an anode [10] or spin coated prior to evaporation of the cathodes [11].…”