Site-selective functionalization of in-plane nanoelectrode-antennas

Abstract

Stacked organic optoelectronic devices make use of electrode materials with different work functions, leading to efficient large area light emission. In contrast, lateral electrode arrangements offer the possibility to be...

How far the chemistry of self-assembled monolayers on gold surfaces affects their work function?

“…Interestingly, self-assembled monolayers (SAMs) enable adding new functionalities to a gold surface for building biosensors, 1,2 modulating the surface electric properties [3][4][5][6][7] and providing new perspectives for molecular devices. 8,9 Several reviews reported on the numerous studies devoted to the morphology of SAMs on various metals. [10][11][12] Among the interesting molecules, dodecanethiol has been investigated in detail and the corresponding SAMs arrange into a brush-like structure with the sulfur moiety strongly bound to gold.…”

“…Measuring values for the WF of functionalized surfaces has been carried out with various techniques: Ultraviolet Photoelectron Spectroscopy (UPS) under vacuum conditions, Kelvin Probe and more recently, Kelvin Probe Force Microscopy (KPFM) in atmosphere or in vacuum. 21,22,32,33 Knowing the WF is critical for devices, it has also been measured in various contexts including electric characterization of barrier heights in junctions, such as metal-organic interfaces, 8,9,21 lightemitting devices (LED), 6 or field emission guns. 34 For example, in the case of the most widely studied SAM, such as dodecanethiol on Au(111), the effective WF was measured mostly with UPS between 3.9 and 4.1 eV.…”