Photophysical and Photoconductive Properties of Novel Organic Semiconductors

Ostroverkhova, Oksana

doi:10.1002/9783527650965.ch10

Cited by 3 publications

(3 citation statements)

References 197 publications

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“…An instructive example can be drawn from studies of charge transport in various TIPS-Pn polymorphs (Table ), in which mobility varied by 2 orders of magnitude depending on the molecular packing. , Molecular packing-dependent changes were also observed in the optical absorption spectra, consistent with previous studies of optical spectra in various functionalized Pn and ADT derivatives. ,,, The highest hole mobility of up 11 cm 2 /(Vs) was obtained in a polymorph with the highest hole transfer integrals achieved in two directions (in the a-b plane), which on the molecular level is enabled by relatively similar π–π stacking distances in these directions (Table ). Notably, the TIPS-Pn polymorph I of Table also exhibited electron mobilities of up to 6.8 cm 2 /(Vs) when doped with o-Meo-DMBI …”

Section: Methodsmentioning

confidence: 99%

Organic Optoelectronic Materials: Mechanisms and Applications

2016

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Organic (opto)electronic materials have received considerable attention due to their applications in thin-film-transistors, light-emitting diodes, solar cells, sensors, photorefractive devices, and many others. The technological promises include low cost of these materials and the possibility of their room-temperature deposition from solution on large-area and/or flexible substrates. The article reviews the current understanding of the physical mechanisms that determine the (opto)electronic properties of high-performance organic materials. The focus of the review is on photoinduced processes and on electronic properties important for optoelectronic applications relying on charge carrier photogeneration. Additionally, it highlights the capabilities of various experimental techniques for characterization of these materials, summarizes top-of-the-line device performance, and outlines recent trends in the further development of the field. The properties of materials based both on small molecules and on conjugated polymers are considered, and their applications in organic solar cells, photodetectors, and photorefractive devices are discussed.

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Section: Methodsmentioning

confidence: 99%

Organic Optoelectronic Materials: Mechanisms and Applications

2016

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“…The LUMO and HOMO energies are, respectively, E LUMO = −1.154 eV and E HOMO = −6.300 eV. Bearing in mind that the HOMO value generally required to be a charge transport polymer (CTP) [90] is between −5.5 and −6.0 eV, we found that the HOMO of styrene is −0.3 eV more than the maximum value required to be a CTP; a difference of 5% from the value that highlights the intrinsic suitability of styrene monomer for charge transport. Based on its HOMO value, functionalization or doping, to name but a few, could easily make styrene a good charge carrier.…”

Section: Resultsmentioning

confidence: 99%

Styrene monomer as potential material for design of new optoelectronic and nonlinear optical polymers: density functional theory study

Noudem,

Fouejio,

Mveme

et al. 2024

R. Soc. Open Sci.

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Using density functional theory, we have studied the intrinsic properties of styrene. First, we determine the optimized structures, structural parameters and thermodynamic properties to make our simulations more realistic to experimental results and check the stability. Second, we investigate optoelectronic, electronic and global descriptors, transport properties of holes and electrons, natural bond orbital analysis, absorption and fluorescence properties. Finally, we study nonlinear optical (NLO) properties: first- and second-order hyperpolarizability, second and third-order optical susceptibilities, hyper-Rayleigh scattering hyperpolarizability, electro-optical Pockel effect, direct current Kerr effects and quadratic refractive index. The bandgap energy E g = 5.146 eV and dielectric constant ε r = 3.062 show that styrene is a good insulator with an average electric field value of 4.43 × 10 8 Vm −1 . Thermodynamic findings show that our molecule is thermodynamically and chemically stable. Electron and hole reorganization energies of 0.393 and 0.295 eV, respectively, show that styrene is more favourable to hole transport than electron transport. Styrene is transparent with linear refractive index n = 1.750 and quadratic n 2 = 1.748 × 10 −20 m 2 W −1 . At the NLO, styrene has a non-zero value of β H R S , which confirms the existence of first-order NLO activity. Globally the study shows that the styrene monomer is suitable for the architecture design of new polymer materials for NLO applications and optoelectronic by functionalization.

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“…Detailed analysis of optical absorption and PL emission spectra of ADT-R-F molecules in solution and in pristine thin films can be found elsewhere. ,− Briefly, it has been established that the spectra of isolated ADT-R-F molecules (i.e., in solutions or dispersed at low concentrations in solid matrices) are not affected by the side group R. In contrast, both the absorption and the PL spectra of pristine ADT-R-F films exhibit differences in the wavelengths of absorption and PL maxima (Table , Figure S1) and in Huang–Rhys factors, ,, dependent on the molecular packing in the film dictated by the side groups R . The absorption spectra of functionalized ADT and Pn derivatives are red-shifted in films as compared to those of solutions by an amount which depends on the molecular packing and is also related to the strength of intermolecular interactions which promote exciton delocalization. , Of all ADT-R-F derivatives used in our studies, the red shift was highest in pristine ADT-TES-F films, which suggests the highest exciton delocalization is in these films, followed by that in pristine ADT-TIPS-F and ADT-TSBS-F films (Table ).…”

Section: Methodsmentioning

confidence: 99%

Small-Molecule Bulk Heterojunctions: Distinguishing Between Effects of Energy Offsets and Molecular Packing on Optoelectronic Properties

et al. 2013

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We report on the dependence of time-resolved photoluminescence (PL) and photocurrent in small-molecule bulk heterojunctions on the donor–acceptor (D/A) LUMO offset, D/A separation, and acceptor domain structure. We chose a high-performance functionalized fluorinated anthradithiophene (ADT) derivative, ADT-TES-F, as the donor and two other fluorinated ADT derivatives, ADT-R-F (where R is a variable side group), as well as two functionalized fluorinated pentacene (Pn) derivatives, Pn-R-F8, as acceptors. The choice of ADT and Pn acceptors enabled us to separate the effects of the D/A LUMO offset, which was approximately zero in the case of ADT acceptors and ∼0.55 eV in the case of Pn acceptors, from those of molecular packing on the optoelectronic properties. The acceptor side groups R were chosen based on (i) packing motifs in the solid state and (ii) size, to achieve different D/A separations at the D/A interface. Addition of an ADT-R-F acceptor to the ADT-TES-F donor introduced disorder, which resulted in increased PL emission, depending on the acceptor’s packing motif, and in reduced photocurrents. In ADT-TES-F/Pn-R-F8 films, charge transfer from ADT-TES-F to Pn-R-F8 was observed with an acceptor packing-dependent formation of an exciplex, which dissociated under applied electric field, contributing to charge carrier photogeneration. However, this contribution was not sufficient to compensate for a photocurrent reduction due to an increased disorder at Pn-R-F8 concentrations of 7 wt % and above, regardless of the acceptor’s R-groups and packing motifs.

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Photophysical and Photoconductive Properties of Novel Organic Semiconductors

Cited by 3 publications

References 197 publications

Organic Optoelectronic Materials: Mechanisms and Applications

Organic Optoelectronic Materials: Mechanisms and Applications

Styrene monomer as potential material for design of new optoelectronic and nonlinear optical polymers: density functional theory study

Small-Molecule Bulk Heterojunctions: Distinguishing Between Effects of Energy Offsets and Molecular Packing on Optoelectronic Properties

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