On the Electrical and Optical Properties Stability of P3HT Thin Films Sensitized with Nitromethane Ferric Chloride Solutions

Hrostea, Laura; Leontie, Liviu; Dobromir, Marius; Doroftei, C.; Gîrtan, Mihaela

doi:10.3390/coatings10111074

Cited by 11 publications

(4 citation statements)

References 25 publications

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“…A reduction of the peak intensity was observed for both the hybrid films, suggesting a decrease in the local order after doping. [ 43 ] The (010) peak intensity faded, and the peak at 2 θ = 26.37° shifted to 26.55° after doping due to the stronger interchain coupling between components. For the pristine polymers, hybrids, and doped hybrids, the variation of d‐spacing for (100) and (002) peaks are plotted in Figure 2c,d.…”

Section: Resultsmentioning

confidence: 99%

Studies on the Doping Mechanism of Conjugated Thienothiophene Polymer/MWCNT Hybrids for Thermoelectric Application

Ignatious

Raveendran

Poovattil

et al. 2022

Macro Materials & Eng

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Conducting polymer‐based thermoelectric (TE) materials have great promise for fabricating lightweight modules that can directly convert waste heat into electricity. Doping is essential for these materials to tune the electrical conductivity and Seebeck coefficient, enhancing their overall TE response. However, the doping mechanism on polymer‐based hybrid systems needs further clarification for materials design and selection. Herein, two different TE hybrids are fabricated using different side‐chain groups containing benzodithiophene‐thienothiophene (BDT‐TTE) based conjugated polymers and multi‐walled carbon nanotubes (MWCNT). The TE properties of the hybrids before and after p‐doping are presented. Post‐doping, a simultaneous increase in electrical conductivity and Seebeck coefficient is observed for the composites of alkylthiophene side‐chain containing polymer, leading to ≈24× enhancements in the power factor (PF). The composite with alkoxy side‐chain polymer showed a nominal increase in electrical conductivity after doping, and the Seebeck coefficient remained unaffected. Tracking of electronic structure and density of valence state (DOVS) revealed the presence of charge‐transfer‐complexes (CTC) with different coordination sites, along with repositioned Fermi level and valance band maximum (VBM) that contribute to the observed differences in the TE response. This work presents a general understanding of the doping mechanism and the underlying physics to design high‐performance organic‐based TE composites.

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Section: Resultsmentioning

confidence: 99%

Studies on the Doping Mechanism of Conjugated Thienothiophene Polymer/MWCNT Hybrids for Thermoelectric Application

Ignatious

Raveendran

Poovattil

et al. 2022

Macro Materials & Eng

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“…Over this temperature range, the electrical current of the samples was measured, showing that the cooling process is not reversible, where the recorded current values during cooling cycle are less than those measured during heating cycle. This indicates that morphological changes occurred in the films that had an impact on the charge transfer mechanisms, which means that the system is not quickly return to its normal state, but rather requires more time [37,38].…”

Section: Temperature Effect On the Electrical Properties Of The Thin ...mentioning

confidence: 99%

Enhancement of electrical and photo-electrical properties of P3HT:CrCl₂ thin films for photo sensing applications

Mahdi,

Al-Saymari

2024

Phys. Scr.

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In this work, doped and undoped P3HT thin films are prepared and deposited onto ITO interdigitated electrodes. To improve the optical and the electrical properties of the pure P3HT thin film, chromium(II) chloride was used as dopant material with three different weight percentage, 2.5%, 5%, 10%. Room-temperature current-voltage (I-V) characteristics of the samples were measured, showing an increase in the electrical current with increasing the dopant concentration. Under dark condition, the conductivity and resistivity of the pure P3HT thin films were enhanced by a factor of 5x as a result of doping the P3HT by 10 wt.% of CrCl2. Under light intensity (50 mW/cm2) and at 10 V bias, the conductivity and resistivity obtained from P3HT:CrCl2 (10 wt.%) thin films are 4.75x10-4 S/cm and ~2 kΩ, respectively. These results exhibit an enhancement by a factor of ~12x compared to those obtained from pure P3HT thin film. The current of the photo-sensors based on doped/undoped P3HT thin films are measured as a function of time under light intensity ranging from 0 to 50 mW/cm2 at 1 V bias, exhibiting high photo-response and good reproducibility. Three different wavelengths, white, green, and red were used as light sources to expose the photo-sensors. Under white light, photo-sensor based on P3HT:CrCl2(10 wt.%) exhibit the highest values of the photo-responsivity and quantum efficiency, ~23.3 mA/W and 5.8%, respectively, showing an enhancement by a factor of ~ 11.5x compared to those obtained from the photo-sensor based on pure P3HT.

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“…The electrical properties of many conjugated have been investigated [10][11][12]. Different parameters, e.g., the dielectric primitivity e', conductance, impedance, loss e" provide a lot of knowledge concerning the chemical or physical state of the polymer.…”

Section: Introductionmentioning

confidence: 99%

Optical properties and dielectric relaxation of polypyrrole and poly (3-hexylthiophene)

Mohamed,

Rehim,

Hameed

et al. 2023

Phys. Scr.

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In the present work polypyrrole (PPy) and poly (3-hexylthiophene) (P3HT) are prepared via oxidation polymerization, their optical and dielectric properties in comparison with their originating monomers are investigated. The chemical structure of both polymers is confirmed by FTIR spectroscopy. Investigation of optical properties of the prepared polymers showed that the band gap of PPY is 1.25 eV, whereas that of P3HT is 1.79 eV. In addition, P3HT showed a refractive index of high values in the visible region compared to PPy. Dielectric relaxation of both monomers and polymers was studied in the frequency range of 10-1  /Hz <107 for comparison. Furthermore, temperature dependencies of their electrical properties are investigated. The DC conductivity values of PPy and P3HT are found to be 2× 10-7 S/cm and 2× 10-4 S/cm, at T = 313 K, respectively, which is the ranges of semiconductors and conductors reflecting the remarkable enhancement of conductivity according to polymerization process. The temperature dependence of the DC conductivity for the monomers and polymers follows Vogel−Fulcher−Tammann (VFT) equation. The parameters of the frequency-dependent provide basic information for adjustment of the structural properties of the conjugated polymers and finding the theoretical limits controlling the charge transport

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On the Electrical and Optical Properties Stability of P3HT Thin Films Sensitized with Nitromethane Ferric Chloride Solutions

Cited by 11 publications

References 25 publications

Studies on the Doping Mechanism of Conjugated Thienothiophene Polymer/MWCNT Hybrids for Thermoelectric Application

Studies on the Doping Mechanism of Conjugated Thienothiophene Polymer/MWCNT Hybrids for Thermoelectric Application

Enhancement of electrical and photo-electrical properties of P3HT:CrCl₂ thin films for photo sensing applications

Optical properties and dielectric relaxation of polypyrrole and poly (3-hexylthiophene)

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On the Electrical and Optical Properties Stability of P3HT Thin Films Sensitized with Nitromethane Ferric Chloride Solutions

Cited by 11 publications

References 25 publications

Studies on the Doping Mechanism of Conjugated Thienothiophene Polymer/MWCNT Hybrids for Thermoelectric Application

Studies on the Doping Mechanism of Conjugated Thienothiophene Polymer/MWCNT Hybrids for Thermoelectric Application

Enhancement of electrical and photo-electrical properties of P3HT:CrCl2 thin films for photo sensing applications

Optical properties and dielectric relaxation of polypyrrole and poly (3-hexylthiophene)

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Enhancement of electrical and photo-electrical properties of P3HT:CrCl₂ thin films for photo sensing applications