Orbital-Dependent Charge Transfer Dynamics in Conjugated Self-Assembled Monolayers

Abstract

Femtosecond charge transfer (CT) dynamics in a series of self-assembled monolayers with an oligo(phenylenethynylene) and oligo(phenyl) backbone is addressed by resonant Auger spectroscopy using the core hole clock method. The characteristic CT times are found to depend strongly on the character of the molecular orbital (MO) which mediates the CT process. This demonstrates that the efficiency and rate of CT through molecular frameworks can be controlled by resonant injection of the charge carriers into specific MOs.

Photoinduced electron transfer processes in dye-semiconductor systems with different spacer groups

“…Unsaturated aliphatic spacer groups, on the other hand, provide a molecular wire for electrons and have little influence on the ET time. This finding is in accordance with previous studies on photoinduced ET in self-assembled molecular layer at surfaces 117,118 as well as electron transport in molecular junctions.…”

Probing charge transfer dynamics in self-assembled monolayers by core hole clock approach

“…3) is described in the respective publications [51,[56][57][58][59][60]. Derived SAMs, abbreviated according to Figure 3, were prepared ex-situ by a standard immersion procedure [55] on Au-covered (30-100 nm), Ti-primed Si(1 0 0) wafers.…”

A Toolbox for Controlling the Energetics and Localization of Electronic States in Self‐Assembled Organic Monolayers

“…These can even adopt the role of functional elements in devices, for example, in highly efficient organic monolayer transistors1, 2 or as self‐assembled monolayer (SAM) based devices in the field of molecular electronics 3, 4, 5, 6, 7, 8, 9, 10, 11. The spatial localization and energetics of the electronic states in these layers play a crucial role, as the states serve as “channels” for the electrical current 12, 13. Therefore, the development of new concepts for wave‐function engineering is highly appealing, aiding both the improvement of existing device structures and the design of new device concepts.…”