Preparation and Properties of Conducting Heterocyclic Polymer Films by Chemical Method

Yoshino, Katsumi; Hayashi, Shigenori; Sugimoto, Ryuichi

doi:10.1143/jjap.23.l899

Cited by 205 publications

(76 citation statements)

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“…The former was synthesized by treating thiophene with FeCl 3 . 36 For the latter, ethyl acetate as nonideal solvent for P3HT was admixed to enhance the aggregation of the RR-P3HT molecules, 37À39 which is therefore referred to as aggRR-P3HT. All sample preparations were performed under argon atmosphere.…”

Section: Sample Preparation and Summary Of Ex-perimental Methodsmentioning

confidence: 99%

Role of Structural Order and Excess Energy on Ultrafast Free Charge Generation in Hybrid Polythiophene/Si Photovoltaics Probed in Real Time by Near-Infrared Broadband Transient Absorption

et al. 2011

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Despite the central role of light absorption and the subsequent generation of free charge carriers in organic and hybrid organicÀinorganic photovoltaics, the precise process of this initial photoconversion is still debated. We employ a novel broadband (UVÀVisÀNIR) transient absorption spectroscopy setup to probe charge generation and recombination in the thin films of the recently suggested hybrid material combination poly(3-hexylthiophene)/silicon (P3HT/Si) with 40 fs time resolution. Our approach allows for monitoring the time evolution of the relevant transient species under various excitation intensities and excitation wavelengths. Both in regioregular (RR) and regiorandom (RRa) P3HT, we observe an instant (<40 fs) creation of singlet excitons, which subsequently dissociate to form polarons in 140 fs. The quantum yield of polaron formation through dissociation of delocalized excitons is significantly enhanced by adding Si as an electron acceptor, revealing ultrafast electron transfer from P3HT to Si. P3HT/Si films with aggregated RR-P3HT are found to provide free charge carriers in planar as well as in bulk heterojunctions, and losses are due to nongeminate recombination. In contrast for RRa-P3HT/Si, geminate recombination of bound carriers is observed as the dominant loss mechanism. Site-selective excitation by variation of pump wavelength uncovers an energy transfer from P3HT coils to aggregates with a 1/e transfer time of 3 ps and reveals a factor of 2 more efficient polaron formation using aggregated RR-P3HT compared to disordered RRa-P3HT. Therefore, we find that polymer structural order rather than excess energy is the key criterion for free charge generation in hybrid P3HT/Si solar cells.

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Section: Sample Preparation and Summary Of Ex-perimental Methodsmentioning

confidence: 99%

Role of Structural Order and Excess Energy on Ultrafast Free Charge Generation in Hybrid Polythiophene/Si Photovoltaics Probed in Real Time by Near-Infrared Broadband Transient Absorption

et al. 2011

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“…shows the spectra simulation for EtNBF10 and LiClO10 ilms, respectively, using the multi-Gaussian function, following the procedure utilized for P3AT polymers [8,9,12,13]. First, we consider the polymer chains without the presence of dopants and without structural changes.…”

Section: Figure 4(c) and (D)mentioning

confidence: 99%

Electrochemical Deposition of P3AT Films Used as a Probe of Optical Properties in Polymeric System

Sá¹,

Basílio²,

Santana³

et al. 2017

Modern Technologies for Creating the Thin-Film Systems and Coatings

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Poly(3-alkylthiophene) (P3ATs) have been extensively used in photovoltaic devices such as a p-type organic Semiconductors. However, several electronic properties of P3ATs present energy transfer inter-and intra-chains that have direct consequences on the performance of optoelectronic devices. Traditionally electrochemical techniques, such as cyclic voltammetry, chronoamperometry and chronocoulometry, have been applied to process polymer thin ilms and unconventional spectroscopy techniques are used to characterize the electronic properties. In the present work, we used an innovative technique called ellipsometry emission to investigate the optical properties of P3AT ilms. We propose a new approach to study the electrochemical synthesize and unintentional doping processes of polymeric systems. We showed a strong correlation between the electrochemical synthesis and the optical properties controlling the ilm growth conditions for P3ATs. The results obtained in the present study can be potentially utilized for applications in organic devices, mainly in photovoltaic cells when the ilm deposition and the optical properties control are relevant.

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“…The polymerization reaction is a variant of the Kumada cross coupling, using nickel or palladium in a Grignard coupling with an organic halide [13]. In 1984 Sugimoto et al published a synthetic route using iron(III)chloride (FeCl 3 ) as a Lewis acid and polymerization catalysts in anhydrous chloroform (CHCl 3 ) [14]. Since all these groups used a symmetric monomer the resulting polythiophenes were regioregular.…”

Section: Conjugated Thiophenes a Historical Viewmentioning

confidence: 99%

Asymmetric Oligothiophenes : Chemical Evolution of Multimodal Amyloid Ligands

Johansson

2015

Linköping Studies in Science and Technology. Dissertations

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Luminescent conjugated polymers (LCPs) and luminescent conjugated oligothiophenes (LCOs) can be used as molecular probes to study diseases associated with protein aggregation. The conventionally used dyes to study and detect protein aggregates, denoted amyloid, have been Congo red (CR) and Thioflavin T (ThT). In contrast to these amyloid ligands, LCOs offer the possibility to detect aggregated proteinaceous species occurring at earlier stages of amyloid formation as well as to distinguish different morphotypes of protein aggregates. The interaction between the LCOs and the protein deposits can be studied by fluorescence spectroscopy and microscopy both in vitro and ex vivo. In this thesis we report the development of multimodal asymmetric LCOs that can be utilized with two novel techniques, Surface Plasmon Resonance (SPR) and Positron Emission Tomography (PET), to study and visualize the interaction between LCO and amyloid fibrils in real time. With SPR, we have been able to determine binding affinities between LCO and amyloid, and with PET we have shown that radiolabelled LCOs might be used as a non-invasive method to study amyloid deposits in vivo. In addition, by alteration of the backbone (change of thiophene units), and of adding different side chain functionalities, we have shown that the properties of the amyloid ligands have a huge impact of the binding to different stages or forms of protein aggregates. By making asymmetrical LCOs, which can be attached to a surface, we also foresee a methodology that will offer the possibility to create a sensitive and selective detection method, and maybe lead to a lab-on-a-chip-application. VIII IX POPULÄRVETENSKAPLIG SAMMANFATTNINGTidigare arbete i Peter Nilssons forskargrupp har visat att luminiscenta konjugerade polymerer (LCPs) och luminiscenta konjugerade oligotiofener (LCOs) kan användas som molekylära prober för att studera sjukdomar associerade till protein aggregering. De konventionellt använda markörerna för att studera och detektera proteinaggregat, så kallad amyloid, är Kongorött (CR) och Thioflavin T (ThT). I kontrast till dessa konventionella markörer har Nilssons forskargrupp visat att LCOs, på grund av deras flexibla konjugerade struktur, och laddning kan upptäcka både tidigare stadier av proteinaggregat samt också skilja på olika typer av aggregat. När LCO interagerar med proteinaggregaten kan denna interaktion studeras med fluorescens mikroskopi både in vitro och ex vivo. Arbetet i den här avhandlingen beskriver utvecklingen av amyloidligander från polymera till osymmetriska material samt två nya tekniker för att studera interaktionen mellan LCO och amyloida fibrer i realtid, Surface Plasmon Resonance (SPR) och Positron Emission Tomography (PET). Med SPR har vi kunnat bestämma bindingsaffiniteter mellan LCO och amyloida fibrer, och med PET har vi visat att radioinmärkta LCOs kan användas som en icke-invasiv metod för att studera amyloid in vivo. Under min forskarutbildning har jag syntetiserat och karaktäriserat både symmetriska och osymmetr...

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Preparation and Properties of Conducting Heterocyclic Polymer Films by Chemical Method

Abstract: Heterocyclic conducting polymer films are prepared by the oxidative cationic polymerization of thiophene, pyrrole and furan. Electrical and optical properties of these polymer films are similar to those using electrochemically prepared polythiophene, polypyrrole and polyfuran.

Cited by 205 publications

References 0 publications

Role of Structural Order and Excess Energy on Ultrafast Free Charge Generation in Hybrid Polythiophene/Si Photovoltaics Probed in Real Time by Near-Infrared Broadband Transient Absorption

Role of Structural Order and Excess Energy on Ultrafast Free Charge Generation in Hybrid Polythiophene/Si Photovoltaics Probed in Real Time by Near-Infrared Broadband Transient Absorption

Electrochemical Deposition of P3AT Films Used as a Probe of Optical Properties in Polymeric System

Asymmetric Oligothiophenes : Chemical Evolution of Multimodal Amyloid Ligands

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