Search

A novel two-dimensional organic semiconductor material [1]benzothieno[3,2-b][1]benzothieno[2,1-b:3,4-b′:6,5-b′′:7,8-b′′′]tetra(benzothiophene) (BTBTTBT) which largely extends the scope of the π-conjugated framework of heteroarene through “H” configuration was synthesized and its thermal, optical and electrochemical properties were investigated. This 2D molecule enables the easy growth of single-crystalline microribbons by the physical vapor transport method, which were evidenced by XRD, SEM and TEM. The single-crystalline OFET devices were fabricated based on the individual BTBTTBT microribbon and the remarkable high mobility of 17.9 cm2 V−1 s−1 and on/off ratios of over 107 could be achieved. [ABSTRACT FROM AUTHOR]

A donor–acceptor–donor (D–A–D) type small molecule DHB-QDTB, with dicyano-substituted quinoidal benzo[1,2-b:4,5-b′]dithiophene as the acceptor, was designed and synthesized. A high electron mobility up to 0.88 cm2 V−1 s−1 was observed for DHB-QDTB based transistors under ambient conditions, suggesting quinoidal benzo[1,2-b:4,5-b′]dithiophene is an excellent acceptor unit in D–A type n-channel organic semiconductors. [ABSTRACT FROM AUTHOR]

To explore how the different intermolecular non-covalent interactions synergistically affect the molecular packing and properties when they existed at the same molecules. A series of new pyrene derivatives with chalcogen atoms as bridges were designed and synthesized. The single crystal structures of the compounds revealed the significant effect of different intermolecular non-covalent interactions on the molecular packing. The thin film transistor devices were fabricated and exhibit high mobility over 0.04 cm 2 V −1 s −1 . The distinct difference of the OFETs performance suggests that the intermolecular non-covalent interactions have very important effect on gearing the molecular packing and properties. [ABSTRACT FROM AUTHOR]

Highlights: [•] A novel thienoacene derivative C6-DBTTA is synthesized. [•] Thermal, optical and electrochemical properties of the C6-DBTTA were studied. [•] The field effect transistor based on the semiconductor C6-DBTTA was constructed and characterized. [•] The microstructure of thin films was characterized by XRD. [•] The morphology of thin films was characterized by AFM. [ABSTRACT FROM AUTHOR]

Organic field effect transistors (OFETs) have potential applications in gas sensing area, but the performance and diversity of n-type OFETs are still far behind that of p-type OFETs due to the poor stability in air atmosphere. Herein, a series of novel dicyanomethylene-terminated quinoids compounds were synthesized and characterized by using electron withdrawing aromatic heterocycles as the core structural units. The introduction of alkyl branch chain greatly improves the solubility, which is helpful to the preparation of thin film OFETs devices by low-cost solution method. These OFETs show typical n-channel FET characteristics with mobility ranging from 10−3∼10−1 cm2V−1s−1. Among them, the 3-T-TZCN based OFETs exhibit the best stability, in which the mobility decreased no more than 18 % after 90 days stored in air atmosphere, this is an outstanding performance compared with the previous researches. We further investigated the dimethyl methylphosphonate (DMMP, which is a substitute for detecting sarin) gas sensing performance of each material, the experimental results indicated that the sensitivity, recovery and stability of 3-T-TZCN are better than other materials, and the limit of detection can be lower to 10 ppb level. This general approach could offer new solution for constructing n-type OFET-based gas sensors with good stability in air atmosphere. [Display omitted] ● A series of novel dicyanomethylene-terminated quinoids compounds were synthesized. ● The solution-processed OFETs show good electron mobility up to 0.1 cm2V−1s−1. ● The OFETs exhibit good long-term ambient stability when placed in air for 90 days. ● The OFETs sensors show good sensitivity, selectivity and stability to DMMP gas. ● The limit of detection for DMMP gas can be lower to 10 ppb. [ABSTRACT FROM AUTHOR]

To explore the influence of intermolecular interaction force on the performance of the sensor, a serial of organic semiconductor materials based on thienylene-vinylene-thienylene (TVT) derivatives were synthesized and characterized. X-Ray diffraction measurement of the single crystals of these TVT derivatives show relatively loose herringbone packing structure. Thin film transistors (TFT) based on the TVT derivatives were constructed and showed highest mobility up to 0.69 cm2V−1s−1 for TVT-NA. These OFET decives were further used as gas sensor and the TVT-BF demonstrates good sensitivity and selectivity for detection of ammonia (NH 3) gas. The differences in sensing performance is consistent with the simulation calculation results of interactions force between the TVT derivatives and NH 3. These general approach demonstrates that noncovalent interaction could greatly affect its sensor capability and offer a new thought for design of high perofrmance gas sensing materials. Three thienylene-vinylene-thienylene derivatives are synthesized and exhibit high mobility and excellent sensitivity and selectivity for detection of ammonia. [Display omitted] • A serial of novel organic semiconductor materials based on thienylene-vinylene-thienylene derivatives are synthesized. • The single crystal structure, thermal, optical and electrochemical properties of the TVT derivatives were studied. • The field effect transistor based on the TVT derivatives was constructed and characterized. • The OFET decives are used as gas sensor and demonstrates good sensitivity and selectivity for detection of NH 3 gas. • The relationship between the sensing performance and intermolecular force was explored through simulation calculation. [ABSTRACT FROM AUTHOR]