5 research outputs found
Long-range exciton transport in brightly fluorescent furan/phenylene co-oligomer crystals
The design of light-emitting crystalline organic semiconductors for optoelectronic applications requires a thorough understanding of the singlet exciton transport process. In this study, we show that the singlet exciton diffusion length in a promising semiconductor crystal based on furan/phenylene co-oligomers is 24 nm. To achieve this, we employed the photoluminescence quenching technique using a specially synthesized quencher, which is a long furan/phenylene co-oligomer that was facilely implanted into the host crystal lattice. Extensive Monte-Carlo simulations, exciton-exciton annihilation experiments and numerical modelling fully supported our findings. We further demonstrated the high potential of the furan/phenylene co-oligomer crystals for light-emitting applications by fabricating solution-processed organic light emitting transistors
Applying of C8-BTBT-Based EGOFETs at Different pH Values of the Electrolyte
Electrolyte-gated organic field-effect transistors (EGOFETs) is a popular platform for numerous sensing and biosensing applications in aqueous media. In this work, the variation of electrical characteristics of EGOFETs based on small-molecule organic semiconductor C8-BTBT and polystyrene blend in water solutions at different pH values was investigated. A positive shift of the threshold voltage with near-Nernstian pH sensitivity was demonstrated in the pH range from 4.9 to 2.8, while no measurable pH dependence in the range from 4.9 to 8.6 pH was registered. These results indicate chemical doping of the molecules of organic semiconductors by protons from the electrolyte in the acidic region. In order to check the applicability of the EGOFETs in a flow mode, a flow chamber was designed and assembled. The preliminary results obtained in the flow mode measurements showed a fast response to pH variation
Applying of C8-BTBT-Based EGOFETs at Different pH Values of the Electrolyte
Electrolyte-gated organic field-effect transistors (EGOFETs) is a popular platform for numerous sensing and biosensing applications in aqueous media. In this work, the variation of electrical characteristics of EGOFETs based on small-molecule organic semiconductor C8-BTBT and polystyrene blend in water solutions at different pH values was investigated. A positive shift of the threshold voltage with near-Nernstian pH sensitivity was demonstrated in the pH range from 4.9 to 2.8, while no measurable pH dependence in the range from 4.9 to 8.6 pH was registered. These results indicate chemical doping of the molecules of organic semiconductors by protons from the electrolyte in the acidic region. In order to check the applicability of the EGOFETs in a flow mode, a flow chamber was designed and assembled. The preliminary results obtained in the flow mode measurements showed a fast response to pH variation
Easily Processable Highly Ordered Langmuir-Blodgett Films of Quaterthiophene Disiloxane Dimer for Monolayer Organic Field-Effect Transistors
Self-assembly of highly soluble water-stable
tetramethyldisiloxane-based
dimer of α,α′-dialkylquaterthiophene on the water–air
interface was investigated by Langmuir, grazing incidence X-ray diffraction,
and X-ray reflectivity techniques. The conditions for formation of
very homogeneous crystalline monolayer Langmuir-Blodgett (LB) films
of the oligomer were found. Monolayer organic field-effect transistors
(OFETs) based on these LB films as a semiconducting layer showed hole
mobilities up to 3 × 10<sup>–3</sup> cm<sup>2</sup>/(V
s), on–off ratio of 10<sup>5</sup>, small hysteresis, and high
long-term stability. The electrical performance of the LB films studied
is close to that for the same material in the bulk or in the monolayer
OFETs prepared from water vapor sensitive chlorosilyl derivatives
of quaterthiophene by self-assembling from solution. These findings
show high potential of disiloxane-based LB films in monolayer OFETs
for large-area organic electronics
CCDC 1851983: Experimental Crystal Structure Determination
Related Article: Artur A. Mannanov, Maxim S. Kazantsev, Anatoly D. Kuimov, Vladislav G. Konstantinov, Dmitry I. Dominskiy, Vasiliy A. Trukhanov, Daniil S. Anisimov, Nikita V. Gultikov, Vladimir V. Bruevich, Igor P. Koskin, Alina A. Sonina, Tatyana V. Rybalova, Inna K. Shundrina, Evgeny A. Mostovich, Dmitry Yu. Paraschuk, Maxim S. Pshenichnikov|2019|J.Mater.Chem.C|7|60|doi:10.1039/c8tc04151