Abstract Several properties of a series novel disubstituted pentacenes, in which the substituents are donor and acceptor groups, were investigated by using ab initio methods. In particular, role different substitution positions for group was explored. Calculations predict that pentacene derivatives highly soluble oxidatively stable than unsubstituted pentacene. Simulated absorption spectra show...

The stability of organic solar cells still remains one the main challenges to make this technology suitable for large scale mass production. morphology is degradation channel in currently used bulk heterojunction systems. We introduce three different all-in-one donor–acceptor amphiphilic triads and perform molecular dynamics simulations order investigate stacking donor acceptor sub-molecules af...

Here, we study the temperature-dependent transport properties of OFETs with prototypical OSC 6,13-bis(triisopropylsilylethynyl)pentacene (TIPS-pentacene) co-processed polystyrene (PS) as active layer. The layer is deposited directly on SiO2 using bar-assisted meniscus shearing (BAMS) method. co-processing PS favors a consequential decrease in interfacial trap densities previously reported. Furt...

A real-number to molecular structure mapping is a topological index. It graph invariant method for describing physico-chemical properties of structures specific substances. In that article, We examined pentacene’s chemical composition. The research on the subsequent indices reflected in our paper, we conducted an analysis several including general randic connectivity index, first zagreb sum-con...

Here we introduce time-resolved electric force microscopy measurements to directly and locally probe the kinetics of charge trap formation in a polycrystalline pentacene thin-film transistor. We find that the trapping rate depends strongly on the initial concentration of free holes and that trapped charge is highly localized. The observed dependence of trapping rate on the hole chemical potenti...

This work reports the various aspects of the application of atomic force microscopy (AFM), for the characterization oforganic semiconductors and DNA-based arrays, for organic electronics and biological applications. On these soft surfaces, theamplitude modulation AFM mode was chosen. This choice is argued by a study of dissipative processes, performed on a particularsample, a DNA ch...

Spectral hole burning is frequently observed in molecular solids when a solute dye molecule in a solvent matrix at very low temperature is irradiated with light having a narrow fiequency bandwidth. This phenomenon relies on photo induced changes of the absorption spectrum of the solute. All photochemical reactions lead in principle to such changes, but the extreme sensitivity of the method make...

The interfaces formed between pentacene (PEN) and perfluoropentacene (PFP) molecules and Cu(111) were studied using photoelectron spectroscopy, X-ray standing wave (XSW), and scanning tunneling microscopy measurements, in conjunction with theoretical modeling. The average carbon bonding distances for PEN and PFP differ strongly, that is, 2.34 A for PEN versus 2.98 A for PFP. An adsorption-induc...

Studies of soluble small-molecule semiconductors based on pentacene and anthradithiophene chromophores have generally shown that molecules with strong two-dimensional solid-state interactions yield high-performance thin-film transistors, while similar compounds with onedimensional solid-state interactions form thin-film devices with significantly worse performance. As a further exploration of t...

The aim of this work is to improve charge injection by interposing an appropriately oriented dipole layer between contact and semiconductor in organic thin-film transistors (OTFTs). OTFTs are fabricated with pentacene semiconductor and gold source and drain contacts. The contacts are modified with self-assembled monolayers (SAMs) made of alkane or fluorinated alkane thiols. Ultraviolet photoele...