Self-assembled monolayers (SAMs) of (4-mercaptophenyl) (10-nitro-9-anthryl) acetylene (MPNAA) on Au(111) are studied with scanning tunneling microscopy (STM). Through careful analysis of the bias-dependent sub-molecular features observed in the high-resolution STM images, important structural details of the MPNAA SAM are disclosed, in addition to its structural character common for the anthrace...

A new type of soluble pentacene precursor is synthesized, which extrudes a unit of CO upon heating at 150 degrees C, to produce pentacene in nearly quantitative yield.

Nearly perfect single crystals of pentacene were grown from trichlorobenzene solution. The surface structure of pentacene single crystals has been investigated by frequency modulation atomic force microscopy. Molecularly flat and extraordinarily wide terraces, extended over the width of more than a few micrometers with monomolecular steps, were consistently observed, suggesting that those penta...

In this study, we demonstrate high-performance optical wavelength-selective organic thin-film transistors (TFTs) that incorporate heterogeneous semiconductor materials, poly(3-hexylthiophene) (P3HT) and 6,13-bis(triisopropylsilylethynyl) pentacene (TIPS-pentacene). The electrical characteristics of the fabricated were analyzed in dark to determine how P3HT:TIPS-pentacene ratio affected performa...

The single-molecule conductance of a series BN-acene-like derivatives has been measured by using scanning tunneling break-junction techniques. A strategic design the target molecules allowed us to include azaborine units in positions that unambiguously ensure electron transport through both heteroatoms, which is relevant for development customized BN-doped nanographenes. We show anthracene deri...

Organic/inorganic interfaces play a crucial role in organic electronic devices such as organic field effect transistors (OFETs), organic light emitting diodes (OLEDs) and organic photovoltaics (OPVs). The properties of organic thin-film transistors depend on the transport of charges induced at the semiconductor/gate insulator interface. Structural defects near this interface influence the charg...

OF DISSERTATION THE DEVELOPMENT AND IMPLEMENTATION OF SYSTEMS TO STUDY THE PHYSICAL PROPERITES OF TANTALUM TRISULFIDE AND SMALL-MOLECULE ORGANIC SEMICONDUCTORS The charge-density-wave (CDW) material orthorhombic tantalum trisulfide (TaS3) is a quasi-one dimensional material that forms long ribbon shaped crystals, and exhibits unique physical behavior. We have measured the dependence of the hyst...

The growth of pentacene thin films for applications in thin-film transistors and other organic electronic devices results in a variety of extended structural defects including dislocations, grain boundaries, and stacking faults. We have used scanning tunneling microscopy STM to probe the molecular-scale structure of grain boundaries and stacking faults in a pentacene thin film on a Si 001 surfa...

Bis(triisopropylsilylethnyl) pentacene (TIPS pentacene) was synthesized to increase its solubility in common liquid solvents and, at the same time, enhance the p–p stacking between neighboring acenes in the crystallized state in comparison with unmodified pentacene. Hot-stage microscopy experiments revealed that during heating voids develop along the long axis of the TIPS pentacene films {along...