Modulation of optical, photophysical and electrical properties of poly(3-hexylthiophene) via Gd:CdS nanoparticles

Khan, Mohd Taukeer; Shkir, Mohd.; Alhouri, Baraa; Almohammedi, Abdullah; Ismail, Yasser A.M.

doi:10.1016/j.ijleo.2022.169092

Cited by 9 publications

(5 citation statements)

References 58 publications

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“…As obtained by extracting from the models, the ellipsometric parameters for each blend thin film and for the constituent materials thin films, the dispersion curves of refractive index and extinction coefficient are described in Figure 2. ellipsometry, were compared, and the parameter χ 2 (where χ 2 < 10) was also taken into account, which quantifies the matching of the ellipsometric experimental data with those generated by simulation [27]. As obtained by extracting from the models, the ellipsometric parameters for each blend thin film and for the constituent materials thin films, the dispersion curves of refractive index and extinction coefficient are described in Figure 2.…”

Section: Resultsmentioning

confidence: 99%

Study of Tunable Dielectric Permittivity of PBDB-T-2CL Polymer in Ternary Organic Blend Thin Films Using Spectroscopic Ellipsometry

Hrostea,

Bulai,

Tiron

et al. 2023

Polymers

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The ellipsometric analyses reported in this paper present a novelty by bringing an in-depth optical investigation of some ternary organic blends. This study focuses on the tunability and control of the relative permittivity of active layers by varying the weight ratio of blended materials spin-coated as thin films. To investigate this, an extensive approach based on spectroscopic ellipsometry was conducted on ternary blend (D:A1:A2) thin films, involving a donor [D = chlorinated conjugated polymer (PBDB-T-2Cl)] and two acceptor materials [A1 = a non-fullerene (ITIC-F) and A2 = a fullerene (PCBM)]. The refractive index constitutes a key parameter that exposes insights into the feasibility of photovoltaic cells by predicting the trajectory of light as it transits the device. In this term, higher obtained refractive indexes support higher absorption coefficients. Notably, the dielectric constant can be rigorously tuned and finely calibrated by modest variations in the quantity of the third element, resulting in considerable modifications. Moreover, the inclusion of fullerene in blends, as the third element, results in a smooth topographical profile, further refining the surface of the film. From an electrical point of view, the ternary blends outperform the polymer thin films. The synergistic interaction of constituents emphasizes their potential to enhance solar conversion devices.

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Section: Resultsmentioning

confidence: 99%

Study of Tunable Dielectric Permittivity of PBDB-T-2CL Polymer in Ternary Organic Blend Thin Films Using Spectroscopic Ellipsometry

Hrostea,

Bulai,

Tiron

et al. 2023

Polymers

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“…It measures the change in the amplitude ratio ( ψ ) and phase difference (Δ) of the reflected elliptical polarized light through the sample. The Fresnel reflection coefficient ρ is defined through the equation [ 62 , 63 , 64 , 65 ]: ρ = tan ψe i Δ . The measured spectroscopic data were analyzed through the optical model shown in Figure 8 , and the extracted optical parameters as a function of wavelength are shown in Figure 9 .…”

Section: Resultsmentioning

confidence: 99%

“…It can be noticed that for all samples, the lifetime was in the ps range, and both τ 1 and τ 2 had similar values, indicating that they had the same origin. The average lifetime was calculated through the relation [ 62 , 63 ]:

. The average lifetime of the Ia sample was evaluated to be 598 ps.…”

Section: Resultsmentioning

confidence: 99%

Design of Liquid Crystal Materials Based on Palmitate, Oleate, and Linoleate Derivatives for Optoelectronic Applications

et al. 2023

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Herein, liquid crystalline derivatives based on palmitate, oleate, and linoleate moieties with azomethine cores were synthesized, and their physical, chemical, optical, and photophysical properties were investigated in detail. The mesomorphic activity of these materials was examined through polarized optical microscopy (POM) and differential scanning calorimetry (DSC). The observed results revealed that the stability of the thermal mesophase depends on the terminal polar as well as on the fatty long-chain substituents. Purely smectogenic phases were detected in all three terminal side chains. A eutectic composition with a low melting temperature and a broad smectic A range was found by constructing a binary phase diagram and addressing it in terms of the mesomorphic temperature range. The energy bandgap of the palmitate-based derivative (Ia) was determined as 3.95 eV and slightly increased to 4.01 eV and 4.05 eV for the oleate (Ib) and linoleate (Ic) derivatives, respectively. The optical constants (n, κ, εr, and εi) were extracted from the fitting of measured spectroscopic ellipsometer data. The steady-state spectra of these samples exhibited a broad emission in the range 400–580 nm, which was found to be blue shifted to 462 nm for both Ib and Ic derivatives. The average fluorescence decay lifetime of the Ia derivative was found to be 598 ps, which became faster for the Ib and Ic derivatives and slower for the sample with a chloride end polar group.

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“…The absorption was found to increase with the alkyl side chain length until ICI10 and thereafter slightly decreases for the IC over, the low energy absorption tail becomes more prominent with increase side chain length as revealed from Figure that ICI6 has no tail while the sampl more prominent tail. The direct energy bandgap (Eg) of synthesized liquid materials was evaluated through Tauc's Equation [42][43][44][45]: 𝛼ℎ𝜐 = 𝐴 𝐸 − 𝐸 is the absorption coefficient evaluated by 𝛼 =…”

Section: Uv-visible Absorption Spectramentioning

confidence: 99%

“…Moreover, the low energy absorption tail becomes more prominent with increase of alkoxy side chain length as revealed from Figure that ICI6 has no tail while the sample ICI12 has more prominent tail. The direct energy bandgap (E g ) of synthesized liquid crystalline materials was evaluated through Tauc's Equation [42][43][44][45]: (αhυ) 2 = A E − E g , where α is the absorption coefficient evaluated by α = Absorption thickness . The Tauc plot of four materials is shown in Figure 8.…”

Section: Uv-visible Absorption Spectramentioning

confidence: 99%

Preparation of Laterally Chloro-Substituted Schiff Base Ester Liquid Crystals: Mesomorphic and Optical Properties

et al. 2023

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A new class of Schiff base/ester compounds: ICln, 4-((2′-chlorophenylimino)methyl)phenyl-4″-alkoxy benzoates, were synthesized and their mesophase characteristics and thermal behavior were evaluated. Differential scanning calorimetry (DSC) was used to study mesophase transitions, and polarized optical microscopy was carried out to identify the phases (POM). The results show that all compounds are monomorphic, and enantiotropic nematic (N) phases were seen at all side chains. It was found that lateral Cl atoms in the terminal benzene ring influence both conformation and mesomorphic properties. Comparisons between the present investigated lateral Cl derivatives and their laterally neat, as well as their isomeric, compounds have been briefly discussed. Results revealed that the insertion of lateral Cl substituent in the molecular structure impacts the type and stability of the formed mesophases. The exchanges of the ester-connecting moiety improve their thermal nematic stability than their previously prepared structurally isomeric derivatives. These compounds exhibit a broad absorption in the UV-Visible region, including a peak in UV region and a tail around 550 nm, and there were observed to be absorption tail increases and energy band gap decreases with the increase of the alkoxy side chain length. The photoluminescence (PL) intensity was noted to be quenched for the bulky alkoxy group ascribed to non-radiative recombination through the defect states. Moreover, time resolved fluorescence decay spectra reveal that both the radiative and non-radiative recombination lifetime increases with the increase of alkoxy side chain length.

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Modulation of optical, photophysical and electrical properties of poly(3-hexylthiophene) via Gd:CdS nanoparticles

Cited by 9 publications

References 58 publications

Study of Tunable Dielectric Permittivity of PBDB-T-2CL Polymer in Ternary Organic Blend Thin Films Using Spectroscopic Ellipsometry

Study of Tunable Dielectric Permittivity of PBDB-T-2CL Polymer in Ternary Organic Blend Thin Films Using Spectroscopic Ellipsometry

Design of Liquid Crystal Materials Based on Palmitate, Oleate, and Linoleate Derivatives for Optoelectronic Applications

Preparation of Laterally Chloro-Substituted Schiff Base Ester Liquid Crystals: Mesomorphic and Optical Properties

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