Synthesis, Characterization, and Field‐Effect Transistor Performance of Pentacene Derivatives

Abstract

A series of functionalized pentacene derivatives based on symmetric and asymmetric substitutions of the terminal rings are synthesized (see figure). Field‐effect mobilities as high as 0.23 cm2 V–1 s–1 are obtained with 2,3‐dibrompentacene. These devices show improved stability compared to pentacene and exhibit no significant decrease in mobility or on/off ratio when stored in air, with and without light exposure, even after three months.

Tuning charge transport in solution-sheared organic semiconductors using lattice strain

“…They are effective methods used to design high performance OSCs. (6,(8)(9)(10)(11)(12) During the solution shearing process a shearing plate drags the solution across a heated substrate while keeping the bulk of the solution between the plate and the substrate, with only the evaporation front exposed (Fig. S1, Fig.…”

Synthesis, Morphological and Electrical Characterization of Solution Processable Low Bandgap Organic Materials

“…(14), 4669-4676. Abstract: A series of ethynyl-substituted molecules with the tetraceno [2,[3][4][5][6]thiophene and anthra[2,3-/>]thiophene core have been synthesized. The aim was to investigate the impact of differently bulky side-chain substituents on the packing of the molecule in thin film and hence its thin-film transistor (TFT) mobility.…”

“…We did not observe a direct correlation between substituent size and TFT mobility. However, the 5,12-bis(triisopropylsilylethynyl)tetraceno [2,[3][4][5][6]thiophene has a mobility as high as 1.25 cm /V-s, the 5,12-bis(trimethylsilylethynyI)tetraceno [2,3- Abstract: Understanding the structure-property relationship for organic semiconductors is crucial in rational molecular design and organic thin film process control. Charge carrier transport in organic field-effect transistors predominantly occurs in a few semiconductor layers close to the interface in contact with the dielectric layer, and the transport properties depend sensitively on the precise molecular packing.…”

“…In this Article, we show that the detailed molecular packing in thin organic semiconductor films can be solved through a combination of grazing incidence X-ray diffraction (GIXD), near-edge X-ray absorption spectra fine structure (NEXAFS) spectroscopy, energy minimization packing calculations, and structure refinement of the diffraction data. We solve the thin film structure for 2 and 20 nm thick films of tetraceno [2,[3][4][5][6]thiophene and detect only a single phase for these thicknesses. The GIXD yields accurate unit cell dimensions, while the precise molecular arrangement in the unit cell was found from the energy minimization and structure refinement; the NEXAFS yields a consistent molecular tilt.…”

“…In this paper, we report a method to increase the open-circuit voltage Foe of an organic solar cell by inserting an interfacial layer between the donor and acceptor layers to form a cascade-type energy band structure. We demonstrate its feasibility using a recently reported asymmetric pentacene derivative, tetraceno [2,[3][4][5][6]thiophene (TT) as a donor material, C60 as an acceptor material, and copper phthalocyanine (CuPc) as the sandwich layer. The FOC was increased from 0.3 V for the device with no CuPc sandwich layer to 0.56 V for 13 nm thick CuPc layer.…”