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The synthesis and characterization of a series of monodisperse pyrene-modified oligocarbazoles is described. The carbazoles are linked by ethynylene through the 3- and 6-positions to form stable zigzag molecular backbone.

A new magnetism-assisted chemical vapor deposition method is devised to produce and synthesize branched or iron-capsulated carbon nanotubes (CNTs). The coalescence or the division of the catalyst particles is found to being promoted by the external magnetic field, providing such CNTs.

A simple and controllable method to synthesize single crystalline nanoribbons of copper tetracyanoquinodimethane in a large area is demonstrated by the use of a physical and chemical vapor combined deposition technique. The presented method and the in situ fabrication of crystalline devices and device arrays based on nanoribbons would be attractive for nanoelectronics.

A diabatic model and a first-principle direct method is used to investigate the carrier transport properties of the highly efficient organic light-emitting materials 1,1,2,3,4,5-hexaphenylsilole (HPS) and 1-methyl-1,2,3,4,5-pentaphenylsilole (MPPS). The theoretical studies have shown that the electron mobility is very close to that of the hole and the carrier mobilities for MPPS are larger than those for HPS.

Study is conducted to demonstrate that linearly condensed fused-ring pentathienoacene represents a new class of p-channel semiconductor with good stability owing to their large band gap. The fused ring thiophene shows high mobility of 0.045 cm(super 2)/V s while this stable organic semiconductor similar to pentacene would be extremely valuable for the application in organic electronics.

The structures, photoluminescence, and charge carrier transport properties of 1,1-disubstituted 2,3,4,5-tetraphenylsiloles as well as the effect of substituents on these characteristics are investigated. The single crystals of the three siloles involving 1,1-dimethyl 2,3,4,5-tetraphenylsilole, 1-methyl-1, 2,3,4,5-pentaphenylsilole and 1,1,2,3,4,5-hexaphenylsilole were grown and their crystal structures are determined by X-ray diffraction.

A simple low-temperature supercritical fluid-assisted method is used to synthesize single-crystalline manoribbons coated with crystalline multisheath oxide, with a nominally uniform coating over the entire outer surface of the nanoribbons. The methodology reported is highly versatile.

Study of the self-assemble of Hs-Pc and its application as a hole injection material in OLEDs is presented. Phthalocyanine monolayer-modified gold substrates showed high efficiency as anodes for organic light-emitting diodes.

Two soluble phthalocyanine derivatives, 2, 9, 16-tri(tert-butyl)-23-(10-hydroxydecyloxy) phthalocyanine (1) and 2, 9, 16-tri(tert-butyl)-23-(10-hydroxydecyloxy) copper phthalocyanine (2) were used as semiconductor layers in organic thin-film transistors (OTFTs) based on their Langmuir - Blodgett (LB) films. The highest occupied molecular orbital and the lowest unoccupied molecular orbital were determined, and the energy band diagram of their OTFT can be deduced by the cyclic voltammetric measurements.

A new class of n-type semiconductors is described for organic thin film transistors (OTFTs), which is based on core-expanded naphthalene diimides fused with 2-(1,3-dithiol-2-ylidene)malonitrile groups. This class of n-type organic semiconductors has relatively low-lying LUMO levels and good film-formation ability, thus exhibiting good environmental stability even with prolonged exposure to ambient air.

Synthesis, characterization, and solvatochromic properties of two asymmetrically substituted dicyanovinyl heterotetracenes are demonstrated. Both experimental and computational results suggested that the two heterotetracenes have low-lying lowest unoccupied molecular orbital and hence might find potential use as n-type or bipolar organic semiconductors for organic electronics.

A template chemical vapor deposition method was developed for scalable synthesis of few-layer graphene ribbons (FLGRs) with controlled morphologies. The realized controllable and scalable synthesis of graphene provides an application of graphene in nanoelectromechanic (NEM) switches and to conduct valuable studies for both the scientific and the practical applications of graphene.

The synthesis, crystal structure and photophysical properties of a new series of ladder-type heteroacenes containing both pyrrole and furan rings, 5,6-disubstituted diindolo[3,2-b:4,5-b']thiophenes (DITs) are described. The size of substituents and the molecular dipole moment have effects on the solid-state packing simultaneously, and the S-S interactions enhance the electronic transport between molecules.

The design and fabrication of a series of organic semiconductors which exhibit excellent field-effect properties due to strong intermolecular interactions and proper molecular energy levels is described.

The synthesis and characterization of a series of highly fluorescent, pyrene-modified oligo(2,7-fluorene ethylene)s is reported. The complexes could be used as optoelectronic material to study fluorescent structure-property relationship of fluorene derivatives.

A new class of high-performance organic field effect transistor (OFET) semiconductor based on perylo[1, 12,b,c,d]thiophene (PET) is analyzed. The analysis has shown that the extraordinary solid-state packing arrangement with the likelihood of double-channel fashion induced by marked S...S interactions have contributed to the high performance.

The outstanding electronic properties of low-cost organic transistors and invertors that use the M-TCNQ (M-Ag or Cu)-modified Ag or Cu source-drain (S-D) electrodes in bottom-contact configurations are described. It is shown that the contact resistance and energetic mismatch typically observed with the low-cost bare electrodes in the petacene bottom-contact organic field-effect transistors (OFETs) can be properly removed.

A new organic field-effect transistor (FET) semiconductor based on triarylamine units with a macrocyclic structure is described. The molecular ordering of ethylene linked triphenylamine dimers in vapors deposited thin films changed remarkably when the molecular structure changed from linear to cyclic type and cyclic structure also led to a significant reduction of the reorganized energy.

A study reports the fabrication of organic field-effect transistors (OFETs) with 1-imino nitroxide pyrene as the semiconductor layer. The device can be operated within low voltage and shows p-type FET characteristics with excellent performance.

Four X-shaped oligothiophenes with different conjugation length are investigated as novel electron donors in single-layer bulk-heterojunction solar cells. The simple organic single-layer bulk-heterojunction photovoltaic cell with four X-shaped oligothiophenes as novel donors and PCBM as an acceptor are fabricated.

The fabrication and characterization of field-effect transistor based on an individual multiwalled nitrogen-doped carbon nanotube is reported. Temperature dependence of two-terminal transport experiments suggests that transport is dominated by thermionic emission and tunneling through a 0.2 eV Schottky contact barrier.

Four donor-acceptor functionalized molecular materials with symmetrical structures are synthesized and investigated for their use in optoelectronic applications. These materials exhibit multifunctional properties, such as a red light-emitting behavior and a large photovoltaic effect.

A self-assembled nanojunction based on thioacetyl para-phenylene ethynlene (TA- PPE) and Au nanogap electrodes worked well as a nanometer-scale photo-switch and p-type transistor. With photoirradiation on/off, the tunneling junction can be switched on/off quickly as a nanometer-scale photoswitch.

An investigation conducted in situ assembly of ZnS nanobelts during the growth process without the assistance of any lithographic technique is presented. This functional structure formed by ID nanomaterial assembly may be well applied in the research of the electronic properties of Zns nanobelts and in nanoscale devices.

Photoluminescence (PL) and electroluminescence (EL) properties of a poly(p-phenylenevinylene) (PPV) derivative cantaining crown ether (C-PPV) are investigated. The PL quantum yield as high as 90% in solution and a temperature independence are observed.

The wettability of the honeycomb-like aligned carbon nanotubes (ACNT) films is investigated. The microstructure in carbon nanotubes (CNT) is important to create a lower sliding angle and the information was useful for designing a bio-mimetic hydrophobic surface structure for variety of applications like a effective water repellent and anti adhesive properties against particular contamination.

Results proved the asymmetrically substituted phthalocyanine (Pc) not only possess good solubility in common organic solvents but also possesses an ideal Langmuir-Blodgett (LB) film forming ability. A linear relationship between the logarithm of the concentration of NO2 and the resistance of sensor was observed.

Good organic field-effect transistor (OFET) properties of three amphiphilic tris(phthalocyaninato) rare earth triple-decker complexes are presented. The high OFET performance is ascribed to the intramolecular pi-pi stacking and the intermolecular edge-to-edge interaction of J aggregates in the Langmuir-Blodgett (LB) films, which provide the pi electrons with an extensive area for delocalization.