Interfacial Chemistry of Pentacene on Clean and Chemically Modified Silicon (001) Surfaces

Abstract

The interactions between pentacene and the Si(001)-(2 × 1) surface have been investigated using Fourier transform infrared spectroscopy (FTIR), ultraviolet photoelectron spectroscopy (UPS), and X-ray photoelectron spectroscopy (XPS). The pentacene molecules in the first layer react with the Si surface atoms through the CdC double bonds and via cleavage of C-H bonds. This chemisorption is accompanied by disruption of the conjugated π electron system. The disrupted interfacial layer is stable throughout deposition and evaporation of thicker pentacene films. Pentacene molecules in layers beyond the first layer adsorb molecularly and yield well-defined valence band features that are characteristic of a conjugated π electron system. Functionalization of the Si surface with a monolayer of cyclopentene inhibits dissociation of subsequently deposited pentacene molecules.

Höhere Acene: vielseitige organische Halbleiter

“…Auf der Cyclohexenmonoschicht abgeschiedene Pentacenschichten sind deutlich einheitlicher und geordneter. [168] …”

Plastic electronic devices: From materials design to device applications

“…Conventional high-vacuum sublimation of pentacene onto clean surfaces gives shallow pyramids with terraces of molecular thickness and breadths of tens of microns [101]. These broad islands fuse to make substantially continuous films, even to the point of crystal axis registry [60].…”

Tunable Crystal Nanostructures of Pentacene Thin Films on Gate Dielectrics Possessing Surface‐Order Control

“…It is also well-known that the charge transport properties of pentacene semiconductors are closely related to the crystalline nano-structure, micro-structure, and molecular orientation in the pentacene nanolayers in contact with the gate dielectric, [21][22][23][24][25][26][27][28][29][30] although the exact form of these correlations is not yet well understood. Accordingly, optimizing OFET performance requires controlling and understanding the crystal nucleation and growth mechanism of the first seeding pentacene molecules deposited on the dielectric.…”