Carboxylic acid anchoring groups for the construction of self-assembled monolayers on organic device electrodes

Effect of acidic and basic surface dipoles on the depletion layer of indium tin oxide as measured by in-plane conductance

“…The need for meticulous control of interfacial properties is obvious, for example, in molecular electronics, where surface dipole effects can dominate contact potentials and determine whether reproducible performance of molecule-based devices is achieved. 10 In the current study, the in-plane conductance of ITO is followed while changing: ͑a͒ the surface charge, and ͑b͒ polarity of the dipole sheet at the film surface, by exposure to acids and bases, similar to the changes in ͑ITO͒ upon reaction with acids and bases observed by Nüesch et al, 11 Appleyard, 12 and Carrara et al 13 ITO samples were purchased from Delta Technologies ͑Stillwater, MN͒ as 150-300 Å thick films ͑70-100 ⍀/ᮀ͒ deposited on aluminosilicate glass. Copious rinsing in electronic grade isopropanol followed by drying under a fast stream of N 2 proved sufficient to obtain reproducible conductance values.…”

Molecules and Electronic Materials

“…The importance of metal±molecule interactions is also clear from the inversion of dipole direction upon adsorption of benzoic acids on indium tin oxide (ITO) or on Al. [29] Vilan et al found a similar inversion of dipole moment of a given molecule, dependent on whether or not there is close (< 1±2 ) proximity between electron-withdrawing or -donating substituents on that molecule and a given metallic contact. In the latter case, this was ascribed to partial charge redistribution between metal and molecule.…”

Modification of Transparent Conducting Oxide ( TCO ) Electrodes through Silanization and Chemisorption of Small Molecules

“…For example, benzoic acid derivatives have been used to modify the interface dipole at ITO surfaces, attached to the oxide surface via formation of a Langmuir-Blodgett thin film. Changes in work function closely relate to changes in the dipole induced by the derivatized modifiers [67].…”