We show here that the carrier mobility in novel sp-sp(2) hybridization planar 6,6,12-graphyne sheet should be even larger than graphene sheet. Both graphyne and exhibit a Dirac cone structure near Fermi surface. However, due to forming triple bonds graphyne, electron-phonon scattering is reduced compared with of graphene. The calculated at first-principles level by using Boltzmann transport equation coupled deformation potential theory. intrinsic 4.29 × 10(5) cm(2) V(-1) s(-1) for holes 5.41...

A photoelectronic switch of a multilevel memory device has been achieved using meta-conjugated donor-bridge-acceptor (DBA) molecule. Such DBA optoelectronic molecule responds to both the optical and electrical stimuli. The exhibits good bistable switching behaviors under dark, with large ON/OFF ratio more than 10(6). In cooperation UV light, ternary states are addressable in system. On basis CV measurement, charge carriers transport modeling, quantum chemical calculation, absorption spectra...

Thermoelectric energy converters can directly convert heat to electricity using semiconducting materials via the Seebeck effect and Peltier effect. Their efficiency depends on dimensionless thermoelectric figure of merit material, which is defined as zT = S(2)σT/κ with S, σ, κ, T being coefficient, electrical conductivity, thermal absolute temperature respectively. Organic for applications have attracted great attention. In this review, we present our recent progress made in developing...

Blue light: Incorporation of two fluorenyl rings into a phenyl group at the C9 position fluorene builds bulky and rigidly tetrahedral framework, which is functionalized by carbazole groups. This molecule possesses excellent thermal morphological stability, miscibility to phosphorescent dopant, high triplet energy, leading narrow blue emission. Since Forrest's advanced dye improve light-emission efficiencies,1 organic light-emitting diodes (OLEDs) have made dramatic progress. Because...

Four new copolymers P1–P4 containing the same backbone of bithiazole acceptor unit and benzodithiophene donor but different side chain pattern were synthesized by Pd-catalyzed Stille coupling. The effect chains on conformation, solubility, absorption spectra, energy levels, charge transport, blend film morphology, photovoltaic properties polymers experimentally theoretically investigated. planarity main increases in order P3 < P4 P1 ≈ P2. Upon increasing chain, polymer exhibits red-shifting...

Control of doping is crucial for enhancing the thermoelectric efficiency a material. However, organic semiconductors often reduces their mobilities, making it challenging to improve performance. Targeting on this problem, we propose simple model quantitatively obtain optimal level and peak value figure merit (zT) from intrinsic carrier mobility, lattice thermal conductivity, effective density states. The reveals that high mobility low conductivity give rise maximum zT. To demonstrate how...

Abstract The synthesis and characterization of four dendron‐containing tetraphenylethylenes (TPEs), 1 – 4 , were synthesized, along with a TPE compound that contained OCH 2 Ph groups (referred to as 0 ) for comparison. Photophysical studies revealed the core became emissive after linking dendrons onto its periphery. Moreover, fluorescence intensity was significantly enhanced when high‐generation linked core; increased in following order: &lt; 3 . This phenomenon tentatively attributed an...

A new solution-processable conjugated copolymer (P1) of perylene diimide (PDI) and dithienothiophene (DTT) incorporating acetylene spacers was synthesized by palladium(0)-catalyzed Sonogashira coupling reaction. Theory calculation reveals that introduction rod-like ethynylene spacer in the polymer main chain promotes planarity π-conjugation chain. Relative to (P2) PDI DTT without spacers, P1 exhibits 0.1 eV down shift LUMO level 89 nm red low-energy absorption band. Polymer top-contact...

We propose a combined computational scheme to predict the thermoelectric properties of organic semiconductors, taking α-form phthalocyanine crystals H2Pc, CuPc, NiPc, and TiOPc as examples. This completely parameter-free approach combines first-principles band structure calculations, Boltzmann transport theory, deformation potential theory for electron-phonon coupling, nonequilibrium molecular dynamics heat transport. abandon constant relaxation time approximation commonly practiced in...

Chromophore reactions with changes to conjugation degree, especially those between the conjugated and unconjugated state, will bring a large spectral variation. To realize such process, meso-naked BODIPY (MNBOD) two electron-withdrawing groups around core is designed synthesized. The resulting system extremely sensitive bases. red, highly fluorescent solution readily becomes colorless non-fluorescent after base addition; however, color fluorescence can be totally instantly restored by...

An efficient approach is demonstrated for preparing functional organic field-effect transisotrs (OFETs) by using spiropyran-co-methyl methacrylate (MMA) as the photoactive gate dielectric. These OFETs are capable of photomodulating carrier density in conductive channel, thereby resulting high responsivity. As a service to our authors and readers, this journal provides supporting information supplied authors. Such materials peer reviewed may be re-organized online delivery, but not...

Abstract According to the quantum deformation approach gravity, thermodynamical entropy of a quantum-deformed (q-deformed) black hole with horizon area A established by Jalalzadeh is expressed as $$S = \pi \sin \left( \frac{A}{8G\mathcal {N}} \right) /\sin \frac{\pi }{2\mathcal {N}}\right) $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mi>S</mml:mi> <mml:mo>=</mml:mo> <mml:mi>π</mml:mi> <mml:mo>sin</mml:mo> <mml:mfenced> <mml:mfrac> <mml:mi>A</mml:mi>...

Abstract Two regiochemically defined polythiophenes containing thiazolothiazole acceptor unit were synthesized by palladium(0)‐catalyzed Stille coupling reaction. The thermal, electrochemical, optical, charge transport, and photovoltaic properties of these copolymers examined. Compared to P1 with head‐to‐head two middle thiophenes, P2 head‐to‐tail thiophenes exhibits 40 nm red shift absorption spectrum in film 0.3 eV higher HOMO level. Both polymers exhibit field‐effect hole mobility as high...

Based on a new n-type building block 5,5′-bibenzo[c][1,2,5]thiadiazole (BBT), we designed and synthesized carbazole–BBT D–A copolymer (P1), compared it with its carbazole–benzo[c][1,2,5]thiadiazole (BT) analog P2. P1 has good solubility in common organic solvents, while P2 poor solubility. In films, exhibit absorption maxima at 565 614 nm, respectively. The HOMO level of is −5.51 eV, 0.18 eV lower than that P2, the LUMO −3.56 slightly low-lying energy levels blue-shifted are attributed to...

A new class of multiply hydrogen-bonded heteroduplexes from readily available amidourea derivatives was designed, and their structures selective assembling behaviors were investigated. Amidourea derivative 3 could selectively assemble with 1 to form a stable heteroduplex via eight intermolecular bifurcated hydrogen bonds, but not 2 at all, because unique the spacing effect, although possessed same hydrogen-bonding sequence. The high stability selectivity will make amidourea-based be...

The simple one-pot syntheses of sulfur-rich thiepin-fused heteroacences with an alkylidene-fluorene framework, THA1 and THA6 (thiepin-fused heteroacene 1 or 6, in which the thiepin is conjugated at both ortho positions SCH3 SC6 H13 , respectively), reported. Based on electrochemical studies theoretical calculations, their LUMO energies are relatively low (-3.26 eV), HOMO HOMO-1 orbitals nearly degenerate. ring contributes mainly to orbitals, however, dominantly reside thienoacence rings....

Abstract Various functionalized host molecules and building blocks can be derived from the cone‐shaped cyclotriveratrylene (CTV). In this article, we report on synthesis of CTV‐I 3 derivatives 3a 3b their Sonogashira cross‐coupling with various terminal aryl‐alkynes, to synthesize CTV‐phenylacetylene in moderate good yields. way, three star‐like conjugated dendrimers rigid macrocyclic cores 4k – m , which showed photophysical properties, were also synthesized. The band gaps are 3.49, 3.49...

Transparent conductive electrodes (TCEs) possessing a combination of high optical transmission and good electrical conductivity find applications in numerous optoelectronic devices. A low cost fabrication fine metal‐mesh structure on rigid (glass) flexible (polyethylene terephthalate – PET) substrates as promising feasible approach for fulfilling large size TCE requirements is proposed. roll‐to‐sheet ultraviolet imprinting protocol to transfer microtrench structures using...

According to the quantum deformation approach gravity, thermodynamical entropy of a quantum-deformed (q-deformed) black hole with horizon area $A$ established by Jalalzadeh is expressed as $S_q = \pi\sin \left( \frac{A}{8G\mathcal N} \right) /\sin\left(\frac{\pi}{2\mathcal N}\right)$, where $\mathcal N=L_q^2/L_{p}^2$ q-deformation parameter, $L_{p}$ denotes Planck length, and $L_q$ cosmic apparent distance. In this paper, assuming that q-deformed associated Friedmann-Robertson-Walker (FRW)...

Information query is an important basic function in MIS. Nowadays cell phones are rapidly growing popularity, thus order to develop MIS applications, it very significant research the way of using messages system. A design method about universal system which based on SMS introduced this paper.

Abstract The title reactions allow new and effective access to various dihydrooxazine derivatives.