Manipulation of Work Function and Surface Free Energy of Tungsten Oxide Hole Injection Layer Modified with a Self-Assembled Monolayer

2011 ◽  
Vol 50 (1S2) ◽  
pp. 01BB01 ◽  
Author(s):  
Seong-Ho Kim ◽  
Hanae Otsuka ◽  
Hyea-Weon Shin ◽  
Kuniaki Tanaka ◽  
Rigoberto C. Advincula ◽  
...  
Keyword(s):  
Free Energy ◽  
Work Function ◽  
Tungsten Oxide ◽  
Surface Free Energy ◽  
Hole Injection ◽  
Self Assembled Monolayer ◽  
Hole Injection Layer ◽  
Self Assembled

Manipulation of Work Function and Surface Free Energy of Tungsten Oxide Hole Injection Layer Modified with a Self-Assembled Monolayer

2011 ◽  
Vol 50 ◽  
pp. 01BB01 ◽  
Author(s):  
Seong-Ho Kim ◽  
Hanae Otsuka ◽  
Hyea-Weon Shin ◽  
Kuniaki Tanaka ◽  
Rigoberto C. Advincula ◽  
...  
Keyword(s):  
Free Energy ◽  
Work Function ◽  
Tungsten Oxide ◽  
Surface Free Energy ◽  
Hole Injection ◽  
Self Assembled Monolayer ◽  
Hole Injection Layer ◽  
Self Assembled

The effects of humidity and surface free energy on adhesion force between atomic force microscopy tip and a silane self-assembled monolayer film

2010 ◽  
Vol 25 (3) ◽  
pp. 556-562 ◽  
Author(s):  
Chien-Chao Huang ◽  
Lijiang Chen ◽  
Xiaohong Gu ◽  
Minhua Zhao ◽  
Tinh Nguyen ◽  
...  
Keyword(s):  
Atomic Force Microscopy ◽  
Free Energy ◽  
Surface Free Energy ◽  
Adhesion Force ◽  
Capillary Condensation ◽  
Self Assembled Monolayer ◽  
Force Microscopy ◽  
Atomic Force ◽  
Rate Of Increase ◽  
Self Assembled

The relationship between atomic force microscopy probe-sample adhesion force and relative humidity (RH) at five different levels of surface free energy (γs) of an organic self-assembled monolayer (SAM) has been investigated. Different γs levels were achieved by exposing a patterned SiO2/CH3-terminated octyldimethylchlorosilane SAM sample to an ultraviolet (UV)/ozone atmosphere. A model consisting of the Laplace-Kelvin theory for capillary condensation for nanosized probe and probe-sample molecular interaction was derived to describe the adhesion force as a function of RH from 25 to 90% for different SAM γs values. The equations were solved analytically by using an equivalent curvature of the probe tip shape. Experimental results show that the adhesion force increases slightly with RH for nonpolar SAM. However, for polar SAM surfaces, it increases at first, reaches a maximum, and then decreases. Both the rate of increase and the maximum of the adhesion force with humidity are γs-dependent, which is in good agreement with theoretical prediction. The large rise in the adhesion force in this RH range is due to the capillary force.

High performance organic light emitting diodes using substoichiometric tungsten oxide as efficient hole injection layer

2012 ◽  
Vol 13 (5) ◽  
pp. 796-806 ◽  
Author(s):  
Maria Vasilopoulou ◽  
George Papadimitropoulos ◽  
Leonidas C. Palilis ◽  
Dimitra G. Georgiadou ◽  
Panagiotis Argitis ◽  
...  
Keyword(s):  
Tungsten Oxide ◽  
High Performance ◽  
Light Emitting Diodes ◽  
Organic Light Emitting Diodes ◽  
Hole Injection ◽  
Light Emitting ◽  
Hole Injection Layer ◽  
Organic Light

Manipulation of graphene work function using a self-assembled monolayer

2014 ◽  
Vol 116 (8) ◽  
pp. 084312 ◽  
Author(s):  
Jung-Tak Seo ◽  
Jihye Bong ◽  
Janghwan Cha ◽  
Taekyung Lim ◽  
Junyoung Son ◽  
...  
Keyword(s):  
Work Function ◽  
Self Assembled Monolayer ◽  
Self Assembled

Modulation of indium–tin oxide work function by a versatile self-assembled monolayer measured with the scanning Kelvin nanoprobe

2011 ◽  
Vol 89 (12) ◽  
pp. 1512-1518 ◽  
Author(s):  
Christophe Blaszykowski ◽  
Larissa-Emilia Cheran ◽  
Michael Thompson
Keyword(s):  
Work Function ◽  
Tin Oxide ◽  
Indium Tin Oxide ◽  
Light Emitting Diode ◽  
Critical Role ◽  
Protective Layer ◽  
Organic Coating ◽  
Hole Injection ◽  
Self Assembled Monolayer ◽  
Self Assembling

In molecular optoelectronics, high-quality contacts at electrode|organics interfaces are crucial for charge carriers to efficiently flow through and therefore play a critical role on device performance. Electrode surface morphology, adhesibility, wettability, and work function are thus many parameters that must be accurately controlled, which is achievable using self-assembling monolayer (SAM) surface chemistry. Herein, we employ this technique to alter the electronic and surface energy-related properties of indium–tin oxide (ITO). In comparison to unmodified ITO, the newly introduced SAM-derivatized surface exhibits limited wettability and considerably higher work function (ΔΦ = ~1.2 eV). Several applications are proposed for this organic coating, notably at the anode of organic light-emitting diode (OLED) devices for decreasing the hole injection barrier or as an atmospherically stable protective layer in the coatings industry.

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