Energy transfer processes in electrochemical P3HT thin films

Schura, Aleffe Bruno; Sá, Sankler Soares de; Silva, Raigna Augusta; Santana, Henrique de; Marletta, Alexandre; Therézio, Eralci M.

doi:10.1007/s10854-019-00721-6

Cited by 6 publications

(6 citation statements)

References 36 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The value of Eonset can be explained to the P3HT in terms of: (i) the conjugation length of the polymeric chains, the shorter the length of the conjugated polymeric segment, the greater the value of Eonset [21] and (ii) the feature regioregular of the polymeric main chain, that is, Eonset increase if the regioregularity decrease of the polymeric chains [28,29]. The data obtained for Eonset are in accordance with the literature [18,30] and in concordance of Kinoshita et al where the characteristic absorption range for the regioregular P3HT is 415 to 650 nm [29]. The values in Table 1 show Eonset of P3HT decreases in the presence of reduced graphene oxide (RGO).…”

Section: Resultssupporting

confidence: 87%

“…Whereas the energy transfer processes depend on a series of photophysical processes it is, in general, necessary to correlate different experimental techniques to be fully clarified. Specifically, for studies involving energy transfer, the Emission Ellipsometry (EE) [17] using Stokes Parameter Spectroscopy (SPS) [18] is a powerful technique that allows to fully describe the polarization state of the light emitted with the aid of Stokes Theory [19]. Thus, it is possible to apply EE to study energy transfer from photo-excited carriers in polymeric and conjugated materials [18][19][20][21].…”

Section: Introductionmentioning

confidence: 99%

“…Specifically, for studies involving energy transfer, the Emission Ellipsometry (EE) [17] using Stokes Parameter Spectroscopy (SPS) [18] is a powerful technique that allows to fully describe the polarization state of the light emitted with the aid of Stokes Theory [19]. Thus, it is possible to apply EE to study energy transfer from photo-excited carriers in polymeric and conjugated materials [18][19][20][21]. Furthermore, as EE describes all analyzed light polarization states, it is possible to obtain complete information on molecular ordering, [19] anisotropy factor [22] and, asymmetry factor [23].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Emission Ellipsometry Study in Polymeric Interfaces Based on POLY(3-Hexylthiophene), PCBM and Graphene

Kolbow,

Rambo,

Santos

et al. 2024

Preprint

View full text Add to dashboard Cite

We analyzed the interaction of two acceptor materials, reduced graphene oxide (RGO) and [6,6]-phenyl-C6-butyric acid methyl ester (PCBM), and poly(3-hexylthiphene) (P3HT), as well as the dependence of its photophysical properties with the temperature in the range 90 to 300 K. The nanocomposite of the films was analyzed by optical absorption ultraviolet-visible (UV-Vis) and photoluminescence (PL) and emission ellipsometry (EE) in a function of sample temperature. The surface morphology was studied by atomic force microscopy (AFM). We noted that onset levels (Eonset) of the nanocomposite of P3HT and RGO is smaller than the others. The PL spectra showed the presence of anomalies in the emission intensities in the nanocomposite of P3HT and PCBM. It was also possible to determine the electron-phonon coupling by calculating the Huang-Hys parameters and its dependence with the sample’s temperature. Through EE it was possible to analyze the degree of polarization and the anisotropy. We observed a high degree of polarized emission of the P3HT films which varies subtly according to the temperature. For nanocomposites with RGO the polarization degree in the emission decreases and the roughness on the surface increases. As a result, the RGO improves the energy transfer between adjacent polymer chains at the cost of greater surface roughness. Then, the greater energy transfer may favor applications of this type nanocomposite in OPVC's with enhancement in energy conversion efficiency.

show abstract

Section: Resultssupporting

confidence: 87%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Emission Ellipsometry Study in Polymeric Interfaces Based on POLY(3-Hexylthiophene), PCBM and Graphene

Kolbow,

Rambo,

Santos

et al. 2024

Preprint

View full text Add to dashboard Cite

show abstract

“…Thus, a redshift occurs when the excitation energy is decreased (longer wavelength); in the case shown, the maximum PL changes from 410 to 510 nm. Furthermore, when excited at 320, 340, and 360 nm, the PL spectra of CDQs a showed similar emission intensities, which may imply similarity in the quantum luminescence efficiency ( Therézio et al, 2011 ; 2013 ) and the same energy transfer rate (Stokes shift) ( Schura et al, 2019 ). However, in the PL spectra of CQDs b , when excited at these same energies (320, 340, and 360 nm), there is a substantial increase in the PL intensity as the excitation changes, certainly implying a higher luminescence quantum efficiency.…”

Section: Resultsmentioning

confidence: 89%

Carbon quantum dots: An environmentally friendly and valued approach to sludge disposal

et al. 2022

View full text Add to dashboard Cite

Sewage sludge, produced daily and inherent to urban development, presents problems of disposal that are still challenging today. Its disposal still offers palliative solutions, where the final destination is generally in landfills or, restrictively, to use in agriculture. The synthesis of carbon quantum dots (CQDs) from sewage sludge is a better alternative to use the stock of organic material present in the sludge. The present work aims to produce Carbon quantum dots (CQDs) using principles of green chemistry and to use an alternative raw material intrinsic stock of carbon present in sewage sludge, making its final disposal more sustainable. The material obtained has a core structure mainly composed of sp2 carbon and nitrogen. The surface functional groups containing sulfur, nitrogen, and oxygen of CQDs were investigated using FTIR and TG/DSC coupled FTIR techniques. The CQDs showed a luminescence decay time equivalent to fluorescent compounds and with satisfying quantum yield since no passive/oxidizing agent or material purification process was used. The photoluminescence spectroscopy analysis showed that the CDQs excitation λmax was at 360 nm and caused a λmax emission at 437 nm (CQDsa) and 430 nm (CQDsb). The CQDs obtained showed sizes of 9.69 ± 2.64 nm (CQDsa) and 10.92 ± 2.69 nm (CQDsb). In vitro experiments demonstrated the uptake of CQDs by the endothelial cell line EAhy 926 and their nontoxicity. However, the production of CQDs can be used for the sustainable disposal of sewage sludge.

show abstract

“…Conjugated polymers have found many uses in devices such as thin-film transistors, organic photovoltaics, and organic light-emitting diodes. − Their use is driven, in part, by their lower cost and weight when compared to similar inorganic counterparts. The conjugated polymer found in the active layer of such devices exhibits optoelectronic processes such as exciton formation, charge separation, recombination, trapping, and charge transport. − There are many structural factors that can affect these properties, and there is significant evidence that a major contributor is the conformation of the conjugated polymers in the active layer. − Moreover, there are several factors that affect the polymer conformation in the active layer, such as the concentration of the polymer in predeposition solution, polymer–solvent interactions, and post-processing methods such as annealing at elevated temperatures. − …”

Section: Introductionmentioning

confidence: 99%

Correlation of the Structure with Performance in MEH-PPV/dPS Thin Films Illuminated during Processing

Moncada

Terlier

Ivanov

et al. 2021

ACS Appl. Polym. Mater.

View full text Add to dashboard Cite

Thin films containing conjugated polymers have been used in a wide array of optoelectronic devices, and much research has focused on the conformation of the conjugated polymer as a key aspect to tuning the performance of the resulting devices. White light exposure has been studied as a post-processing method to alter the film’s morphology and photoluminescence (PL) in systems composed of poly[2-methoxy-5-(2-ethylhexyloxy)-1,4-phenylenevinylene] (MEH-PPV) and polystyrene (PS). To date, there have been few studies that correlate the changes in the depth profile with the PL performance of MEH-PPV/PS films. This study is designed to address this gap in knowledge. Thin films of MEH-PPV/dPS annealed above the glass transition temperatures (T g) in an illuminated environment led to lower PL than that found in annealed samples that are not illuminated. However, at higher MEH-PPV loading in the blend film, the extent of variation of PL with illumination diminished. Time-of-flight secondary ion mass spectrometry and small-angle neutron scattering document the three-dimensional morphology of the films under illumination conditions, which are correlated with the changes in PL. Illumination during annealing compressed MEH-PPV-rich layers in the thin film blends at low loadings of MEH-PPV (below 10 wt %) but resulted in significant in-plane phase separation at higher loadings (above 15 wt %). Both changes increase interchain interactions and lower the PL of the illuminated samples. The changes in the depth profile significantly alter the PL of the films, while the in-plane phase separation affected the optoelectronic properties to a lesser degree. This work, therefore, provides insights into how illumination and film composition can be utilized to predictably alter the structure and optoelectronic performance of conjugated polymer blend films.

show abstract

Energy transfer processes in electrochemical P3HT thin films

Cited by 6 publications

References 36 publications

Emission Ellipsometry Study in Polymeric Interfaces Based on POLY(3-Hexylthiophene), PCBM and Graphene

Emission Ellipsometry Study in Polymeric Interfaces Based on POLY(3-Hexylthiophene), PCBM and Graphene

Carbon quantum dots: An environmentally friendly and valued approach to sludge disposal

Correlation of the Structure with Performance in MEH-PPV/dPS Thin Films Illuminated during Processing

Contact Info

Product

Resources

About