Morphology-dependent exciton diffusion length in PPE-PPVs thin films as revealed by a Forster mechanism based-study

Saaidia, A.; Saïdani, Mabrouka; Romdhane, S.; Fredj, A. Ben; Egbe, Daniel Ayuk Mbi; Tekin, Emine; Bouchriha, H.

doi:10.1016/j.synthmet.2017.02.023

Cited by 6 publications

(4 citation statements)

References 41 publications

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“…Normally upon absorption, the photo-excitation migrates with an intrinsic diffusion length. This latter is typically 10-20 nm for organic materials [61,62]. The charge transfer occurs only when the diffusion length is longer than the distance separating two consecutive tubes.…”

Section: Resultsmentioning

confidence: 99%

Correlation between microstructures and optical properties of polyaniline/single‐walled carbon nanotubes composites

2018

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The polyaniline was doped with sulfonic acid and functionalized with single-walled carbon nanotubes. The effects of single-walled carbon nanotubes (SWCNTs) inserting and thermal annealing at T = 393 K, during 24 h are carried out by optical and structural study. Structural characterizations of D-polyaniline (PANI) or D-PANI/SWCNTs compounds at both pristine and annealed states were obtained by Fourier Transform infrared analysis and scanning and transmission electron microscopies. Optical parameters including absorption coefficient, optical transition type, energy gaps, skin depth, and extinction coefficient have been also elucidated from optical absorption measurements. Moreover, the characteristics of the localized states introduced either by SWCNTs adding and/or annealing temperature are carried out. By referring to the starting material, the direct (indirect) optical band gap was found to be reduced from 3.91 (3.75) to 2.35 (2.24) eV, after SWCNTs inserting and annealing. Moreover, new localized states having a band width of 390 meV are created at 1.25 eV. The SWCNTS dispersion quality on the organic matrix and the PANI self-crosslinking lead to the charge transfer and the resulting interpenetrating network can be used as active layers for organic solar cells. POLYM. COMPOS., 40: E821-E831, 2019.

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Section: Resultsmentioning

confidence: 99%

Correlation between microstructures and optical properties of polyaniline/single‐walled carbon nanotubes composites

2018

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“…At the molecular scale, annealing leads to partially dispersed and oriented SWCNTs in cross-linked PANI. Electron–hole pairs, which constitute the exciton pairs, are born in the PANI matrix and then migrate by diffusion [ 20 , 144 ]. From the Scharber diagram, the resulting electronic structure presents a band gap suitable for a relatively higher conversion efficiency and is qualified by good compatibility with the solar spectrum [ 145 ].…”

Section: Pani/swcnt Nanocompositesmentioning

confidence: 99%

“…According to Francis et al, CNTs also improve charge transport and provide good thermal stability, allowing π-conjugated conducting polymers to be good candidates for electrical, thermal, sensing, and actuating applications [ 17 ]. If CNTs are well dispersed and the exciton diffusion length is sufficient, the configuration leads to charge and energy transfer in the organic matrix [ 18 , 19 , 20 ]. This transfer is a major parameter for good photovoltaic conversion.…”

Section: Introductionmentioning

confidence: 99%

Polymer/Carbon Nanotube Based Nanocomposites for Photovoltaic Application: Functionalization, Structural, and Optical Properties

et al. 2022

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We present a systematic review of nanostructured organic materials, including synthesis methods, functionalization, and applications. First, we report the chemical and physical procedures used for preparing the polymer/carbon nanotube composites described in the literature over the last decade. We compare the properties of different polymer-based prototypes of organic nanocomposites functionalized with carbon nanotubes. Theoretical and experimental vibrational investigations provide evidence of the molecular structure describing the interaction between both components, showing that the allowed amount of carbon nanotubes and their dispersion states differ across polymers. Moreover, the nature of the solvent used in the preparation has a significant impact on the dispersion process. The integration of these materials in photovoltaic applications is discussed, where the impact of nanoparticles is evidenced through the correlation between experimental analyses and theoretical approaches based on density functional theory. Alterations in optical properties, evaluated from the absorption and luminescence process, are coherent with the solar spectrum, and a good distribution of donor/acceptor interpenetration was observed. In all cases, it was demonstrated that the performance improvement is physically related to the charge transfer from the organic matrix to the nanoparticles.

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“…In the present work, the optical properties of an anthracene-containing PPE–PPV with statistical side chain configuration (AnE-PVstat) are investigated in solution with regard to its morphological and packing features, and the balance between H- and J-aggregates. , Several studies with detailed analysis of the correlation between morphological and spectral properties of PPV derivatives in thin films have been already published. − However, the photophysical behavior of PPV derivatives, such as AnE-PVstat, in solution is less studied and understood so far.…”

Section: Introductionmentioning

confidence: 99%

Temperature-Tuning of Optical Properties and Molecular Aggregation in AnE-PVstat Copolymer Solution

et al. 2018

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The correlation between the optical and morphological properties of an anthracene-containing poly(phenylene ethynylene)-alt-(phenylenevinylene) statistical copolymer (AnE-PVstat) in solution has been investigated. As a function of temperature, the molecular aggregation in chloroform/chlorobenzene (CF:CB) solution was examined by means of absorbance and photoluminescence measurements. The study of the evolution of the 0–0 to the 0–1 photoluminescence (PL) ratio with temperature in the framework of the HJ-aggregate model unveiled the presence of both H- and J-like behaviors at room temperature. Upon increasing temperature, the interchain intermolecular coupling decreases, leading to a dissociation of H-aggregates. Hence, molecular torsions are facilitated, polymer planarity is reduced, and the intrachain electronic coupling decreases.

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Morphology-dependent exciton diffusion length in PPE-PPVs thin films as revealed by a Forster mechanism based-study

Cited by 6 publications

References 41 publications

Correlation between microstructures and optical properties of polyaniline/single‐walled carbon nanotubes composites

Correlation between microstructures and optical properties of polyaniline/single‐walled carbon nanotubes composites

Polymer/Carbon Nanotube Based Nanocomposites for Photovoltaic Application: Functionalization, Structural, and Optical Properties

Temperature-Tuning of Optical Properties and Molecular Aggregation in AnE-PVstat Copolymer Solution

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