The controllable growth of partially aligned monolayer to multilayer micrometer stripes was demonstrated by adjusting the pulling speed in a dip-coating process. The number of molecular layers decreases with the increasing pulling speed. A lower pulling speed yields mixed multilayers (3-9 monolayers). It is noteworthy that pure monolayer and bilayer microstripes over large areas can be obtained at high pulling speeds. The stripe morphology strongly depends on the pulling speed or the number of molecular layers. XRD and confocal fluorescence measurements manifest that monolayer stripes are amorphous, while multilayer stripes (> or = 2) consist of crystalline states. FET devices were fabricated on these stripes. Monolayer stripes failed to reveal a field effect due to their amorphous state. In contrast, multilayer stripes exhibit good field-effect behavior. This study provides useful information for future molecular design in controlling molecular architectures. The controllable growth from monolayer to multilayer offers a powerful experimental system for fundamental research into the real charge accumulation and transporting layers for OFETs.

Organic semiconductors: Growth of ultrathin (<15 nm), continuous, and microstructured organic semiconductor (OSC) films at monolayer precision is important for organic electronics and a challenging task. Uniform monolayer to hexalayer (ca. 1.6–12 nm; see picture) dendritic OSC microstripes at monolayer precision are grown by a dip‐coating process.

The 1D and 2D arrangement of Au nanoparticles is achieved in the larger grooves (up to 220nm wide) of lithographic patterns on a solid surface (see picture). The average distance between adjacent nanoparticles is tuned by reducing the width of the grooves and increasing the ionic strength of the Au solution. The groove width and thickness of the electric double layer of the particle govern the arrangement of the nanoparticles.

A series of unsaturated long-chain-bridged diferrocenes Fc-(CH2)n-CH=CH-(CH2)n-Fc (4 a-e) was synthesized by means of olefin metathesis. Subsequent catalytic hydrogenation furnished the saturated alpha,omega-bis-ferrrocenyl oligoethylene products Fc-(CH2)m-Fc (5). Members of both series formed highly ordered laminar structures at the highly oriented pyrolytic graphite (HOPG) solid/liquid interface or on the Ag(110) surface, which were characterized by STM. Details of the structural features of these ordered physisorbed surface assemblies of 4 and 5 were analyzed by comparison with DFT calculations on model systems and with the characteristic packing modes of these systems in the crystal.

A method concerning step‐edge‐induced area‐selective growth for the patterning of aromatic organic molecules is proposed. Based on such a growth mechanism, crack‐free, organic crystalline films and the growth of different molecules at defined locations can be achieved. The figure shows a schematic representation of the separation of molecules by nucleation‐sites recognition.

Driven by anticipation of novel applications, enormous progress has been made in organic semiconductors since the 1950s. Historically, much of the initial work was centered on organic light-emitting diodes (OLEDs) [ 1 , 2 ] and photovoltaics (PVs) [ 3 , 4 ] due to their intensive applications. Owing to efforts from both academia and industry over the last two decades, the research interest has dramatically expanded to transistors, [ 5 ] sensors, [ 6 ] memories, [ 7 ] lasers, [ 8 ] etc. In organic microelectronics and optoelectronics, the ability to create scalable high-resolution patterns of semiconductor organic molecules still presents challenges for fabrication technology. As an example, a full-color microdisplay requires high-resolution red, green, and blue (RGB) OLEDs to be patterned in close proximity of micrometers. Current patterning techniques based on shadow-mask [ 9 ] and vapor-jet printing [ 10 ] suffer from low resolution, poor scalability, and complicated multistep processing. Previously, we demonstrated the template-directed growth technique as a promising method for patterning organic semiconductors with tunable physical properties. [11][12][13] Herein, we show the liquid behavior of appropriately selected dye molecules on prepatterned substrates. By further controlling the diffusion of molecules between designed patterns, we achieve heteropatterning of organic materials, that is, the thickness of organic molecule patterns differs in a controlled way over predefi ned areas. Further deposition of a second type of molecule on the heteropatterned structure produces high-resolution, ordered, triple-color organic patterns using only two dyes.In this study, we use N , N ′ -di[( N -(3,6-di-tertbutylcarbazyl))-n -decyl] quinacridone (DtCDQA), an orange light-emitting material with high quantum yield and multiple emission states in both liquid and solid solvents. [ 13 ]

High performance p-/n-type transistors and complementary inverter circuits are demonstrated using patterned polypyrrole (PPY) as pure electrodes. Strikingly, these devices show good stability under continuous operation and long-term storage conditions. Furthermore, PPY electrodes also exhibit good applicability in solution-processed and flexible devices. All these results indicate the great potential of PPY electrodes in solution-processed, all-organic, flexible, transparent, and low-power electronics.

The patterning of conducting polymer PEDOT:PSS, an excellent organic electrode material, with high resolution (50 nm, middle part of figure) on both rigid and flexible substrates by AFM nanoscratching (left part of figure) is demonstrated. The high density electrode array (108 elements cm−2) and small area electrode pair (0.5–0.6 µm2) achieved by this technique demonstrates its excellent patterning ability. The scratched nano/sub‐micrometer channel shows excellent performance in organic transistors (right part of figure) with high performance and low voltage.