Green-absorbing dipyrromethene dyes engineered from bis-vinyl-thienyl modules are planar molecules, exhibiting strong absorption in the 713-724 nm range and displaying comparable electron hole mobilities thin films (maximum value 1 × 10(-3) cm(2)/(V·s)). Bulk heterojunction solar cells assembled with these a fullerene derivative (PC(61)BM) at low ratio give power conversion efficiency as high 4.7%, short-circuit current values of 14.2 mA/cm(2), open-circuit voltage 0.7 V, broad external...

Transient ion drift experiments designed to obtain reliable values for the intrinsic copper diffusivity in silicon are reported. From these measurements, diffusion barrier of Cu Si is determined be $0.18\ifmmode\pm\else\textpm\fi{}0.01\mathrm{eV}$. It shown that commonly used expression Hall and Racette [J. Appl. Phys. 35, 379 (1964)] actually gives an effective coefficient heavily boron-doped can neither other doping levels nor extrapolated lower temperatures. A model developed which...

A new polymer blend formed by poly(3-hexylthiophene)-poly(4-vinylpyridine) (P3HT- P4VP) block copolymers and [6,6]-phenyl-C61-butyric acid methyl ester (PCBM) is reported. The P4VP PCBM are mixed together weak supramolecular interactions, the resulting materials exhibit microphase separated morphologies of electron-donor electron-acceptor rich domains. properties blend, used in photovoltaic devices as active layers, also discussed. Detailed facts importance to specialist readers published...

A large-scale alignment method is used to orient the conjugated polymer poly(2,5-bis(3-dodecyl-2-yl)thieno[3,2-b]thiophene) (C12-pBTTT). This fast one-step does not use any layer and necessarily require postalignment annealing of films. It exploits increased plasticity films for 50 °C ≤ T 125 obtain high in-plane orientations by mechanical rubbing As visualized HR-TEM, C12-pBTTT chains size oriented domains increase with temperature film during (Tr). The have a preferential face-on...

Energy loss is decreased by employing a ternary strategy, which should be an efficient approach to improve the performance of OPVs.

Abstract Doping polymer semiconductors is a central topic in plastic electronics and especially the design of novel thermoelectric (TE) materials. In this contribution, it has been demonstrated that doping oriented semicrystalline P3HT thin films with dopant tris(4‐bromophenyl)ammoniumyl hexachloroantimonate), known as magic blue (MB), helps reach charge conductivities 3000 S cm −1 TE power factors 170 ± 30 μW mK −2 along chain direction. A combination transmission electron microscopy,...

The design of novel low-band-gap conjugated polymers with appropriate frontier orbital energy levels and good charge transport is needed to improve the conversion efficiency organic photovoltaic devices. In this article, we describe synthesis structure−property relationships a series copolymers common backbone differing solubilizing side chains. copolymer optoelectronic properties related device performances are reported. Our results clearly show that chains have major impact on material...

Fullerene-grafted rod−coil block copolymers, designed for being used as active polymer layers in donor–acceptor bulk heterojunction photovoltaic devices, have been synthesized. The copolymer synthesis was monitored by 1H nuclear magnetic resonance, size exclusion chromatography and infrared absorption spectroscopy, while the material properties were explored X-ray diffraction, atomic force microscopy, UV–vis absorption, photoluminescence spectroscopy. Structural of materials thin films...

Abstract Novel fullerene‐grafted poly(3‐hexylthiophene) (P3HT)‐based rod‐coil block copolymers have been synthesized. The regioregular P3HT rod has synthesized by a modified Grignard metathesis reaction (GRIM). An original in situ end‐capping developed order to convert the into an efficient macro‐initiator for nitroxide‐mediated radical polymerization (NMRP) of coil block. Controlled second poly(butylacrylate‐ stat ‐chloromethylstyrene) [P(BA‐ ‐CMS)] done through various conditions leading...

A series of triazatruxene (TAT)-functionalized Bodipy dyes were prepared by a sequence reactions involving either cross-coupling promoted Pd complexes or Knoevenagel reaction leading to vinyl linker. The new show large absorption coefficients and fluorescence quantum yields as well interesting electrochemical properties. blue this exhibit photovoltaic effects (VOC = 0.83 V, JSC 3.6 mA/cm2, efficiency 0.9%) in bulk heterojunction solar cells, due the good hole mobility imported TAT entity.

Stepwise construction of functional triazatruxene platforms allow linking to preorganized diketopyrrolopyrrole bearing thienyl subunits. These dyes exhibit strong absorption until 750 nm in thin films and show favorable redox activity allowing producing efficient organic solar cells when blended solution with PC71BM. A maximum power conversion efficiency 5.3% was obtained. As a service our authors readers, this journal provides supporting information supplied by the authors. Such materials...

Diketopyrrolopyrrole (DPP) derivatives are among the most efficient materials studied for both polymer solar cells (PSCs) and organic field-effect transistors (OFETs) applications. We report here synthesis of new fluorinated dithienyldiketopyrrolopyrrole (fDT-DPP) monomers suitable direct heteroarylation polymerization. fDT-DPP copolymers were then prepared to probe effect fluorination. It was found that they feature deeper HOMO energy levels smaller bandgaps than their non-fluorinated...

Positive impacts on the PCE by using thiazole instead of thiophene in soluble electron-donor small molecules for OPV.

Boron dipyrromethene (BODIPY) and its derivatives are known to be efficient photon-harvesting chromophores. However, their study as active materials in bulk heterojunction (BHJ) solar cells is still scarce. In this study, the development of new synthetic ways design original BODIPY-based dumbbell-shape molecules, including a first 2,3,5,6-tetravinyl aromatic BODIPY molecule, reported. High fill factors can obtained BHJ when blended with fullerene derivative, leading record power conversion...

As simplifying the device structure is a key step for future of organic electronic, we report herein high efficiency universal host materials red, green and blue Single-Layer Phosphorescent OLEDs.

Abstract Herein, a high‐efficiency host material for single‐layer phosphorescent organic light‐emitting diodes (SL‐PhOLEDs) is reported. This synthesized via an efficient approach and constructed on the association of electron‐rich phenylacridine unit connected by spiro carbon atom to electron‐deficient 2,7‐bis(diphenylphosphineoxide)‐fluorene. In addition high E T value adequate highest occupied molecular orbital/lowest unoccupied orbital energy levels, key point in this design suitable...

Abstract Herein reported is the impact of functionalization four different semiconducting polymer structures by a linear siloxane‐terminated side‐chains. The latter tetrasiloxane (Si 4 ) or trisiloxane 3 chains, substituted at their extremity to pentylene linker. structure based on 5,6‐difluorobenzothiadiazole comonomer (PF2), diketopyrrolopyrrole unit (PDPP‐TT), naphtalediimide (PNDI‐T 2 ), and poly[bis(thiophen‐2‐yl)thieno[3,2,b]thiophene (PBTTT). properties these siloxane‐functionalized...

Copper‐silicide precipitates in silicon obtained after copper diffusion and quench different liquids were studied by transmission electron microscopy capacitance spectroscopy techniques. A correlation between the quenching rate, geometric size, deep level spectra of copper‐silicide was established. The unusually wide are shown to be due a defect‐related band bandgap. parameters evaluated using numerical simulations. positive charge p‐type moderately doped n‐type Si is predicted simulations...

In this work, we use rf magnetron sputtering to deposit at room temperature a ZnO thin film on top of photoactive material based P3HT:PCBM blend for organic photovoltaic devices. We investigate the influence conditions crystallinity, substrate layer nanoscale morphology and device performances. show that, under appropriate conditions, modification causes no functional damage layer, leads an improved performance

The synthesis of a new alternating copolymer (PTBzT2-C12) based on thiophene-benzothiadiazole-thiophene (TBzT) segment and thieno[3,2-b]thiophene unit its utilization as electron donor in photovoltaic bulk heterojunctions are reported. has been obtained via Stille cross-coupling reaction. material's optical electrochemical properties, solution or thin films, have investigated using UV-visible absorption well photoluminescence spectroscopy cyclic voltammetry. A significant red-shift the edge...

BOPHY dyes absorbing in the 400–800 nm range give a PCE as high 4.3% with an EQE higher than 70%.

Nowadays, phosphorescent organic light-emitting diodes (PhOLEDs) is a widespread technology, in which all the high-performance devices are constructed on stack of different layers called multi-layer (ML-PhOLEDs). Thanks to these functional layers, injection, transport, and recombination holes electrons emissive layer (EML) significantly improved, allowing reach high performances. In this ideal single-layer PhOLEDs (SL-PhOLEDs), with very simple only constituted by electrodes EML. These...

We demonstrate that the substitution of thiophene by thiazole heterocyclic compound as a weak electron-donor unit, in donor-acceptor alternating conjugated materials, allows simultaneous downshift both HOMO and LUMO levels while keeping energy bandgap almost unchanged.