Bibliografias temáticas / P3HT polymer

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Literatura científica selecionada sobre o tema "P3HT polymer"

Autor: Grafiati
Publicado: 2 de novembro de 2024

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Artigos de revistas sobre o assunto "P3HT polymer"

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Kubota, Mayara, Ricardo Fernandes e Santana de. "Electrical, optical and structural characterization of interfaces containing poly(3-alkylthiophenes)(P3ATs) and polydiphenylamine on ITO/TiO2: Interaction between P3ATs polymeric segments and TiO2". Journal of the Serbian Chemical Society, n.º 00 (2024): 24. http://dx.doi.org/10.2298/jsc231125024k.

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With the aim of studying the use of conjugated polymers poly(3- methylthiophene) (P3MT), poly(3-hexylthiophene) (P3HT) and polydiphenylamine (PDPA) to make up the active layer of inverted organic solar cells forming the interface with TiO2, and also help shed light on the optical and electronic properties applied to develop this technology, the interfaces between films containing P3MT, P3HT and PDPA on ITO electrode were electrochemically prepared, after chemically depositing a film of TiO2. The systems under investigation were designated ITO/TiO2/P3MT, ITO/TiO2/PDPA/P3MT, ITO/TiO2/PDPA, ITO/TiO2/P3HT and ITO/TiO2/PDPA/P3HT and characterized by Raman techniques (Spectroscopy and Microscopy), Electrochemical Impedance Spectroscopy (EIS) and Photoluminescence (PL). In this study, the aromatic, semiquinone and quinone segments in the polymer matrices of the poly(3-alkylthiophenes)(P3ATs) and PDPA at these interfaces were monitored and characterized by comparison with films of their homopolymers by means of Raman spectroscopy and EIS. Raman imaging demonstrates that the P3MT film can be incorporated into the titanium oxide crystalline lattice. The systems containing P3MT or P3HT were found to strongly interact with the TiO2, stabilizing the P3AT radical cation segments, and the presence of PDPA destabilized this interaction. These findings were complemented by low-temperature (15 K) PL spectra, revealing a reduction in the intensity and displacement of the band associated with radical cation emission, observed in the absence of TiO2 in the system under investigation.
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Sairam, Koneti, e A. Sivagami. "Comparison the Electrical Characteristics of PEDOT: PSS Tandem Solar Cell and P3HT Tandem Solar Cell by Varying Thickness". Alinteri Journal of Agriculture Sciences 36, n.º 1 (29 de junho de 2021): 674–81. http://dx.doi.org/10.47059/alinteri/v36i1/ajas21095.

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Aim: This project aims to improve the electrical characteristics in the polymer tandem solar cell by changing polymers with thickness to increase the efficiency. Methods and Materials: The PEDOT: PSS and P3HT Polymer was chosen as a group having 20 samples in each respectively. The electrical characteristics are stimulated by varying the polymer with thickness. Changing the polymer material leads to improved efficiency in the tandem solar cell. Results: The Independent T test was done which reveals that the P3HT (P = 0.553) was found to be statistically significantly compared with PEDOT: PSS polymer material. Conclusion: The analysis we found P3HT appeared to have better efficiency than PEDOT: PSS polymer tandem solar cell from Green energy. While P3HT(p=0.583) having the better significance compared with PEDOT: PSS (p=0.883).
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Chen, Jean Hong, Jian Yi Li, Lung Chuan Chen e Ching Iuan Su. "Morphology and Microstructure of Aggregates and Gelation Behaviour of Poly(3-hexylthiophene) in Xylene Solution". Applied Mechanics and Materials 479-480 (dezembro de 2013): 115–20. http://dx.doi.org/10.4028/www.scientific.net/amm.479-480.115.

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In this work, we investigate the morphology and microstructure of the aggregates, and the gelation behaviour of Poly(3-hexylthiophene) (P3HT) conjugated polymer in xylene solution as functions of P3HT concentration and aging time by the means of ageing time test, wide angle X-ray diffraction (WAXD), scanning electron microscopy (SEM), UV-visible absorption (UV-vis) and photoluminescence (PL) spectra. The result reveals that the gelation time of P3HT/xylene solution decreases markedly with increasing P3HT concentration. The photophysical properties of the P3HT aggregates in P3HT/xylene solution increase as P3HT concentration and ageing time are raised. It indicates that the well soluble P3HT polymer chains in xylene solution present microphase separation and self-assemble into stiff sheetlike structure, which associates by rodlike nanowhiskers of P3HT polymers during aging. Upon prolonged aging, the sheetlike structure of P3HT aggregates to from the three-dimension network that improves the electronic particle mobility in the organic solar cell.
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García-Escobar, C. H., M. E. Nicho, Hailin Hu, G. Alvarado-Tenorio, P. Altuzar-Coello, G. Cadenas-Pliego e D. Hernández-Martínez. "Effect of Microwave Radiation on the Synthesis of Poly(3-hexylthiophene) and the Subsequent Photovoltaic Performance of CdS/P3HT Solar Cells". International Journal of Polymer Science 2016 (2016): 1–9. http://dx.doi.org/10.1155/2016/1926972.

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Poly(3-hexylthiophene) (P3HT) is a semiconductor polymer that has been proved to be a good electron donor in organic or hybrid solar cells. In this work, a detailed study of P3HT synthesis in CH2Cl2solvent by oxidative method with and without MW assistance has been conducted. Effects of synthesis process parameters on the physical properties of P3HT products and their application in hybrid CdS/P3HT photovoltaic devices were studied. It is observed that the use of MW as well as the reaction time affected the reaction yield and properties of the polymer products. It was found that, by the traditional method (without MW), the maximum yield and the properties of the polymer products were similar after 2 h or 24 h of synthesis. The optimal reaction time with MW for P3HT polymerization in CH2Cl2solvent was 1 h, and the obtained P3HT product showed similar or better properties than those P3HT polymers synthesized by the traditional method in the same solvent. The effect of using MW during the synthesis was to increase yield and crystal size of P3HT. Larger energy conversion efficiency of ITO/CdS/P3HT/CP-Au devices was obtained when the P3HT product had higher molecular weight and head/tail-head/tail (HT-HT) triad contents.
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Orlova, M., S. Didenko, D. Saranin, O. Rabinovich, A. Panichkin e I. Borzykh. "New Polymer Systems for Use in Organic Photovoltaics". International Journal of Nanoscience 17, n.º 05 (outubro de 2018): 1750022. http://dx.doi.org/10.1142/s0219581x17500223.

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In this paper, new polymers for use in organic photovoltaics were investigated. PPBI, PNBI and copolymer MULT are considered as a potential alternative or an effective dopant for P3HT and PCBM. The choice of these materials allows us to find out new information on the prospects and properties of heterocyclic polymers — for thermal stability and resistance to the environment for organic solar cells. The levels of HOMO and LUMO of new heterocyclic polymers were measured, and the results were compared with those of P3HT: PCBM. The level of new polymer MULT photoluminescence was determined. The absorption blend for P3HT: PCBM peak absorption shift was detected by adding 5% (by mass) of the new polymer MULT, the value of 30–40[Formula: see text]nm to longer wavelengths. Data obtained by cyclic voltammetry showed deep HOMO levels of heterocyclic polymers in values of about [Formula: see text]6[Formula: see text]eV, which is promising in terms of acceptor properties.
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Nagamatsu, Shuichi, Masataka Ishida, Shougo Miyajima e Shyam S. Pandey. "P3HT Nanofibrils Thin-Film Transistors by Adsorbing Deposition in Suspension". Materials 12, n.º 21 (5 de novembro de 2019): 3643. http://dx.doi.org/10.3390/ma12213643.

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A novel film preparation method utilizing polymer suspension, entitled adsorbing deposition in suspensions (ADS), has been proposed. The poly(3-hexylthiophene) (P3HT) toluene solution forms P3HT nanofibrils dispersed suspension by aging. P3HT nanofibrils are highly crystallized with sharp vibronic absorption spectra. By the ADS method, only P3HT nanofibrils in suspension can be deposited on the substrate surface without any disordered fraction from the dissolved P3HT in suspension. Formed ADS film contains only the nanostructured conjugated polymer. Fabricated polymer thin-film transistor (TFT) utilizing ADS P3HT film shows good TFT performances with low off current, narrow subthreshold swing and large on/off current ratio.
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Arrigoni, Alessia, Luigi Brambilla, Chiara Castiglioni e Chiara Bertarelli. "Conducting Electrospun Nanofibres: Monitoring of Iodine Doping of P3HT through Infrared (IRAV) and Raman (RaAV) Polaron Spectroscopic Features". Nanomaterials 12, n.º 23 (4 de dezembro de 2022): 4308. http://dx.doi.org/10.3390/nano12234308.

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Aligned polymer nanofibres are prepared by means of the electrospinning of a chlorobenzene solution containing regioregular poly(3-hexyltiophene-2,5-diyl), P3HT, and poly(ethylene oxide), PEO. The PEO scaffold is easily dissolved with acetonitrile, leaving pure P3HT fibres, which do not show structural modification. Polymer fibres, either with or without the PEO supporting polymer, are effectively doped by exposure to iodine vapours. Doping is monitored following the changes in the doping-induced vibrational bands (IRAVs) observed in the infrared spectra and by means of Raman spectroscopy. Molecular orientation inside the fibres has been assessed by means of IR experiments in polarised light, clearly demonstrating that electrospinning induces the orientation of the polymer chains along the fibre axis as well as of the defects introduced by doping. This work illustrates a case study that contributes to the fundamental knowledge of the vibrational properties of the doping-induced defects—charged polarons—of P3HT. Moreover, it provides experimental protocols for a thorough spectroscopic characterisation of the P3HT nanofibres, and of doped conjugated polymers in general, opening the way for the control of the material structure when the doped polymer is confined in a one-dimensional architecture.
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Kyokunzire, Proscovia, Ganghoon Jeong, Seo Young Shin, Hyeong Jun Cheon, Eunsol Wi, Minhong Woo, Trang Thi Vu e Mincheol Chang. "Enhanced Nitric Oxide Sensing Performance of Conjugated Polymer Films through Incorporation of Graphitic Carbon Nitride". International Journal of Molecular Sciences 24, n.º 2 (6 de janeiro de 2023): 1158. http://dx.doi.org/10.3390/ijms24021158.

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Organic field-effect transistor (OFET) gas sensors based on conjugated polymer films have recently attracted considerable attention for use in environmental monitoring applications. However, the existing devices are limited by their poor sensing performance for gas analytes. This drawback is attributed to the low charge transport in and the limited charge–analyte interaction of the conjugated polymers. Herein, we demonstrate that the incorporation of graphitic carbon nitride (g-C₃N₄) into the conjugated polymer matrix can improve the sensing performance of OFET gas sensors. Moreover, the effect of graphitic carbon nitride (g-C₃N₄) on the gas sensing properties of OFET sensors based on poly(3-hexylthiophene) (P3HT), a conjugated polymer, was systematically investigated by changing the concentration of the g-C₃N₄ in the P3HT/g-C₃N₄ composite films. The obtained films were applied in OFET to detect NO gas at room temperature. In terms of the results, first, the P3HT/g-C₃N₄ composite films containing 10 wt.% g-C₃N₄ exhibited a maximum charge carrier mobility of ~1.1 × 10−1 cm2 V−1 S−1, which was approximately five times higher than that of pristine P3HT films. The fabricated P3HT/g-C₃N₄ composite film based OFET sensors presented significantly enhanced NO gas sensing characteristics compared to those of the bare P3HT sensor. In particular, the sensors based on the P3HT/g-C₃N₄ (90/10) composite films exhibited the best sensing performance relative to that of the bare P3HT sensor when exposed to 10 ppm NO gas: responsivity = 40.6 vs. 18.1%, response time = 129 vs. 142 s, and recovery time = 148 vs. 162 s. These results demonstrate the enormous promise of g-C₃N₄ as a gas sensing material that can be hybridized with conjugated polymers to efficiently detect gas analytes.
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Švrček, Vladimir. "Excitation energy transfer in conjugated polymer/silicon nanocrystal-based bulk heterojunctions". Pure and Applied Chemistry 82, n.º 11 (6 de agosto de 2010): 2121–35. http://dx.doi.org/10.1351/pac-con-09-12-01.

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An excitation energy transfer in a bulk heterojunction based on freestanding silicon nanocrystals (Si-NCs) and conjugated polymers {poly(3-hexylthiophene) (P3HT), poly[2-methoxy-5-(2-ethyl-hexyloxy)-1,4-phenylene vinylene] (MEH-PPV)} is demonstrated. The electrochemical etching process is employed for fabrication of freestanding and polymer soluble Si-NCs. Formation of a bulk heterojunction is confirmed by a difference in a work function of both polymers and an ionization potential of the NCs. An annealing step significantly influences the polymer chain conformation and electronic interaction between the polymer and the NC, which improves the exciton energy migration. The presence of the Si-NCs in polymers suppresses the relative intensity of vibronic peaks, resulting in a red-shift of the blend photoluminescence (PL) spectra. This phenomenon is attributed to a temperature-dependent migration process of singlet exciton and Dexter excitation energy transfer from the polymer to the NC. Compared to MEH-PPV polymer, a lamella-type stacking structure of the P3HT and an abridged PL spectra overlap with NCs decreases an excitation energy transfer rate. At the same time, an improvement in photocurrent generation is recorded when Si-NCs are embedded in P3HT polymer. After Dexter-like excitonic energy transfer, the PL emission of both blends is controlled through a quantum confinement effect and electron-hole recombination in Si-NCs.
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Wakahara, Takatsugu, Kun’ichi Miyazawa, Osamu Ito e Nobutaka Tanigaki. "Preparation of Composite Films of a Conjugated Polymer and C60NWs and Their Photovoltaic Application". Journal of Nanomaterials 2016 (2016): 1–5. http://dx.doi.org/10.1155/2016/2895850.

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Composite films of conjugated polymers, such as poly[2-methoxy-5-(3′,7′-dimethyloctyloxy)-1,4-phenylenevinylene] (MDMO-PPV) and poly(3-hexylthiophene) (P3HT), with C60nanowhiskers (C60NWs) were prepared. The photoluminescence originating from the conjugated MDMO-PPV polymers was effectively quenched in the composite film, indicating a strong interaction between the conjugated polymer and C60NWs. The photovoltaic devices were fabricated using C60NW (conjugated polymer) composite films, resulting in a power conversion efficiency of ~0.01% for P3HT with short length thin C60NWs, which is higher than that previously reported for thick C60nanorods. The present study gives new guidance on the selection of the type of C60NWs and the appropriate polymer for new photovoltaic devices.
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Teses / dissertações sobre o assunto "P3HT polymer"

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Mulderig, Andrew J. "Performance and Active Layer Morphology of P3HT-PCPDTBT Organic Photovoltaic Cells". University of Cincinnati / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1457619609.

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Yu, Fei. "Graphene-enhanced Polymer Bulk-heterojunction Solar Cells". University of Cincinnati / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1439310775.

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Xu, Yifan. "Studies on field effect transistors with conjugated polymer and high permittivity gate dielectrics using pulsed plasma polymerization". Connect to resource, 2005. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1124219179.

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Thesis (Ph. D.)--Ohio State University, 2005.
Title from first page of PDF file. Document formatted into pages; contains xx, 187 p.; also includes graphics (some col.). Includes bibliographical references (p. 174-187). Available online via OhioLINK's ETD Center
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Agumba, John O. [Verfasser], e Günter [Akademischer Betreuer] Reiter. "Formation and optical characterization of single crystals of poly(3-hexylthiophene)(P3HT), a model conjugated polymer". Freiburg : Universität, 2016. http://d-nb.info/1119717477/34.

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Livingstone, Veronica Jean. "One-Pot In-Situ Synthesis of Conductive Polymer/Metal Oxide Composites". University of Toledo / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=toledo158860469194691.

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Wang, Wenfeng. "Investigation of Energy Alignment Models at Polymer Interfaces". Scholar Commons, 2014. https://scholarcommons.usf.edu/etd/5148.

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The presented study investigated the Induced Density of Interface States (IDIS) model at different polymer interfaces by using photoemission spectroscopy in combination with electrospray deposition. In recent years, organic electronics have attracted considerable attention due to their advantages of low-cost and easy-fabrication. The performance of such devices crucially depends on the energy barrier that controls the interface charge transfer. A significant effort has been made to explore the mechanisms that determine the direction and magnitude of charge transfer barriers in these devices. As a result of this effort, the IDIS model was developed to predict the energy alignment at metal/organic and organic/organic interfaces. The validity of the IDIS model on molecular interfaces was confirmed by the results of a series of experiments with small molecular materials, which are in good agreement with the theoretical calculations from the IDIS model. The charge neutrality level (CNL) and screening factor for various organic materials can be determined from the linear correlation between the hole injection barrier at metal/organic interface and the work function of its corresponding metal substrate, which stands as one of the most important features of the IDIS model. The study presented here explores whether the IDIS model is also valid for polymer interfaces. Two prototypical polymer materials: poly(3-hexylthiophene) (P3HT) and poly[2-methoxy-5-(2'-ethylhexyloxy)-p-phenylene vinylene] (MEH-PPV) were selected for the investigation. In the first part of this study, a series of metal/polymer interfaces were prepared using electrospray and investigated with photoemission spectroscopy. The linear relationship between the hole barriers extracted from the metal/polymer interface and the work function of its respective metal substrate suggests that the IDIS model is also valid for metal/polymer interfaces. The CNLs and the screening factors of P3HT and MEH-PPV are determined respectively. The experiment results are also discussed with regard to the Integer Charge Transfer (ICT) model. The comparison between the two models suggests that the IDIS model should be applied to interfaces prepared in vacuum while the ICT model works on interfaces with an ambient contamination layer present. The second part of the dissertation discusses the photoemission results of the MEH-PPV/P3HT heterojunction from the perspectives of the two models. The results indicate that the IDIS model is valid for polymer/polymer heterojunctions. The IDIS model more accurately predicted the measured orbital line up by using its principles for organic/organic heterojunction than the ICT model.
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Hon, Sherman Siu-Man. "Calcium vapour deposition on semiconducting polymers studied by adsorption calorimetry and visible light absorption". Thesis, University of British Columbia, 2007. http://hdl.handle.net/2429/863.

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A novel UHV microcalorimeter has been used to study the interaction between calcium and three polymers: MEH-PPV, MEH-PPP and P3HT. All three polymers behave differently in their reaction kinetics with calcium. On MEH-PPV we measure 45 μJ/cm² of heat generated in excess of the heat of bulk metal growth, 120 μJ/cm² for MEH-PPP, and 100 μJ/cm² for P3HT. Comparison of the MEH-PPV and MEHPPP data indicate that the initial reaction of calcium with MEH-PPV occurs at the vinylene group. We propose, based on hypothetical models, that calcium reacts with the vinylene groups of MEH-PPV with a reaction heat of 360 kJ/mol and at a projected surface density of 1.7 sites/nm², while it reacts with the phenylene groups of MEH-PPP in a two-step process with reaction heats of 200 and 360 kJ/mol respectively, at a projected surface density of 3.5 sites/nm². Optical absorption experiments, using either a 1.85 eV diode laser or a xenon lamp coupled to a scanning monochromator, have also been performed using the same calorimeter sensor. In the case of MEH-PPV, using the laser we find an optical absorption cross-section of 3E-¹⁷ cm² per incident calcium atom at low coverages. The change in absorptance at higher coverages correlates perfectly with the population of reacted Ca atoms determined calorimetrically. The size of the absorbance cross-section, and its position just within the band gap of the polymer, are consistent with the reaction being one of polaron formation. Calcium does not appear to dope P3HT, while the photon energy range of 1.5 to 3.75 eV used in these experiments is likely too small for probing polaronic energy states in MEH-PPP.
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Zellmeier, Matthias. "Characterization of hybrid solar cells prepared from poly-thiophenes and silicon". Doctoral thesis, Humboldt-Universität zu Berlin, Mathematisch-Naturwissenschaftliche Fakultät, 2016. http://dx.doi.org/10.18452/17666.

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Das Hauptaugenmerk dieser Arbeit liegt auf der Entwicklung einer Hybridsolarzelle, in der der anorganische Halbleiter Silizium, das organische Polymer und das Kontaktsystem so aufeinander abgestimmt sind, dass ihre Kombination zu einem Bauelement mit hohem Wirkungsgrad führt. Um dieses Ziel zu erreichen wurden verschiedene Maßnahmen ergriffen. Neue Polymermaterialien, abgeleitet von dem prototypischen organischen Halbleiter poly(3-hexylthiophen 2,5 diyl) (P3HT), namentlich poly(3-[3,6-dioxaheptyl]-thiophen) (P3DOT) und poly(3-[2,5,8-trioxanonyl]-thiophen) (P3TOT), wurden umfassend hinsichtlich ihrer Struktur untersucht. Poly thiophen/c-Si hybride Solarzellen, hergestellt aus diesen neuen Polymeren, erreichten Effizienzen bis zu 11 %. Die vollständigen Banddiagramme dieser Poly thiophen/c-Si Hybridgrenzflächen wurden mittels Photoelektronenspektroskopie aufgenommen. Außerdem wurde der Einfluss des Kontaktsystems auf die darunter liegenden Schichten mittels Oberflächenspannungsspektroskopie untersucht. Das Resultat dieser Messungen weißt eine Inversionslage unter der Siliziumoberfläche nach, die sich aufgrund des verwendeten semitransparenten Metallkontaktes formt. Dadurch lassen sich diese Bauteile als MIS Inversionsschicht Solarzelle kategorisieren. Um die Hybridsolarzellen weiter zu verbessern, wurde versucht den semitransparenten Metallkontakt durch Graphen zu ersetzen. Das Graphen wurde durch einen CVD-Prozess gewachsen und erreichte eine laterale Ausdehnung von bis zu 1 cm2. Der Übertrag auf die Solarzelle erfolgte mittels eines Wasser und Zerstörungsfreiem Transferprozess. Trotz dem erfolgreichen Aufbringen des Graphen limitierte ein geringer Füllfaktor aufgrund der geringen Ladungsträgerdichte im Graphen den Wirkungsgrad der Solarzelle. In einem letzten Schritt wurde das Polymer P3HT zum ersten Mal mit polykristallinen Siliziumabsorbern kombiniert. Die invertierte Zellstruktur, die hierbei zu Anwendung kam, erhöhte die Lebensdauer der Solarzelle erheblich.
The scope of this thesis was the development of a hybrid solar cell based on silicon in which the inorganic semiconductor, the organic polymer and the contact system are combined in such a manner to result in a photovoltaic device with high power conversion efficiency. To reach this goal several measures were taken. New polymer materials derived from the prototypical organic semiconductor poly(3-hexylthiophene 2,5 diyl) (P3HT), namely poly(3-[3,6-dioxaheptyl]-thiophene) (P3DOT) and poly(3-[2,5,8-trioxanonyl]-thiophene) (P3TOT), were extensively characterized regarding its structural properties. Poly thiophene/c-Si hybrid solar cells fabricated from these new polymers exhibited power conversion efficiencies up to 11 %. The energy level alignment of these poly thiophene/c Si hybrid interfaces was studied using photoelectron spectroscopy. Furthermore, the influence of the contact system on the underlying wafer is investigated with surface photovoltage measurements. The measurements revealed the formation of an inversion layer beneath the silicon surface due to the semitransparent metal contact used in the devices. Therefore, these devices can be classified as MIS inversion layer solar cells. To further improve the hybrid poly thiophene/c-Si solar cells by substituting the semitransparent metal contact, graphene was implemented in the device design as a transparent front contact. The CVD grown graphene sheet had a lateral size of up to 1 cm2 and was applied onto the solar cell using a non-destructive and water-free transfer process. However, despite the successful transfer the power conversion efficiency was restricted by the low fill factor due to a low charge carrier density in the graphene. As a last step, hybrid solar cells in the combination P3HT/polycrystalline silicon absorbers on glass were fabricated for the first time. The inverted device structure used for these solar cells proved beneficial for the lifetime. These devices were stable for up to 3 months.
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Chapa, Garza Jose L. "A Comparative Study of the Morphology of Flow and Spin Coated P3HT:PCBM Films". University of Akron / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=akron1374520548.

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Aiyar, Avishek R. "Understanding the impact of polymer self-organization on the microstructure and charge transport in poly(3-hexylthiophene)". Diss., Georgia Institute of Technology, 2012. http://hdl.handle.net/1853/43574.

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Conjugated polymers represent the next generation of conducting materials that will enable technological devices incorporating thin film transistors, photovoltaic cells etc., in a cost-effective roll-to-roll manner. Given the importance of microstructure on charge transport, ordered self-assembly in polymeric semiconductors assumes paramount relevance. This thesis thus focuses on a fundamental investigation of the correlations between the morphology and microstructure of the first high mobility solution processable semiconducting polymer, poly(3-hexylthiophene)(P3HT), and its corresponding charge transport properties. The evolution of polymer chain conformations is first studied, leading up to the formation of the conducting channel. An intermediate lyotropic liquid crystalline phase is identified, characterized by anisotropic ordering of the polymer chains. Methods for tuning the microstructure of P3HT thin films are also discussed, with an emphasis on understanding the role of molecular parameters, such as regioregularity and process parameters such as the film formation method. An ultrasound based technique for inducing the formation of ordered π-stacked molecular aggregates is also introduced. The results presented here not only provide understanding of microstructure-charge transport correlations, but also the very process of film formation in solution processable organic semiconductors, which could in turn hold the key to approaching the mobility benchmark represented by single crystals.
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Livros sobre o assunto "P3HT polymer"

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Ludwigs, Sabine. P3HT Revisited – From Molecular Scale to Solar Cell Devices. Springer, 2016.

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Ludwigs, Sabine. P3HT Revisited - from Molecular Scale to Solar Cell Devices. Springer, 2014.

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Ludwigs, Sabine. P3HT Revisited - from Molecular Scale to Solar Cell Devices. Springer Berlin / Heidelberg, 2014.

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Capítulos de livros sobre o assunto "P3HT polymer"

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Musumeci, A. W., G. G. Silva, J. W. Liu, L. Rintoul, E. R. Waclawik e G. A. George. "MWNT Polymer Nanocomposites Based on P3HT". In Advanced Materials and Processing IV, 291–94. Stafa: Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-466-9.291.

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Li, Zhongrui, e Liqiu Zheng. "P3HT-MWNT Nanocomposites by In-situ Polymerization and Their Properties". In In-Situ Synthesis of Polymer Nanocomposites, 303–29. Weinheim, Germany: Wiley-VCH Verlag GmbH & Co. KGaA, 2011. http://dx.doi.org/10.1002/9783527640102.ch12.

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Ahmad, Zubair, Muhammad Awais, Mansoor Ani Najeeb, R. A. Shakoor e Farid Touati. "Poly(3-Hexylthiophene) (P3HT), Poly(Gamma-Benzyl-l-Glutamate) (PBLG) and Poly(Methyl Methacrylate) (PMMA) as Energy Harvesting Materials". In Smart Polymer Nanocomposites, 95–118. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-50424-7_4.

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Kim, Hee Joo, Kyung Lee, Jong Cheol Lee e Sang Jin Moon. "Device Performance of P3HT/C70-Methanofullerene Bulk-Heterojunction Polymer Photovoltaic Cells". In Solid State Phenomena, 935–38. Stafa: Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/3-908451-31-0.935.

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Hejczyk, Tomasz, Jarosław Wrotniak e Wiesław Jakubik. "Numerical Analysis of the Steady State in SAW Sensor Structures with Selected Polymers for Detection of DMMP and CO". In Metal-Oxide Gas Sensors. IntechOpen, 2023. http://dx.doi.org/10.5772/intechopen.109367.

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The chapter presents the results of the numerical investigation of the SAW gas detector structures with selected polymer layers in steady-state conditions. The effect of SAW velocity changes vs. the surface electrical conductivity of the detector structures is predicted on the base of acoustoelectric elemental theory. The electrical surface conductivity of the rough polymer sensing layer placed above the piezoelectric waveguide depends on the profile of the diffused gas molecule concentration inside the whole detector structure. Numerical results in the steady state conditions for the gas molecules DMMP and polymer layer of (RR)-P3HT have been shown as well as for carbon oxide molecules with thin polyaniline and polypyrrole layer. The main aim of the investigations was to study a thin film’s interaction with targeted gases in the SAW detector configuration based on diffusion equations for polymers. Numerical results for profile concentration in steady state conditions for gas molecules concentration, film thickness, roughness, and interaction temperature have been shown. The results of numerical analyzes allow for selecting better detector design conditions, including the morphology of the detector layer, its thickness, operating temperature, and layer type. The numerical results, based on the code written in Python, were shown.
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Pud, Alexander A., Nikolay A. Ogurtsov e Olga S. Kruglyak. "Influence of dopant on the specific features of formation and properties of nanocomposites of poly(3-methylthiophene) with polyvinylidene fluoride". In NEW FUNCTIONAL SUBSTANCES AND MATERIALS FOR CHEMICAL ENGINEERING, 159–74. PH “Akademperiodyka”, 2021. http://dx.doi.org/10.15407/akademperiodyka.444.159.

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The work is devoted to the development and study of conducting nanocomposites of poly(3-methylthiophene) (P3MT) and poly(vinylidene fluoride) (PVDF), suitable for changing properties when interaction with of the environment components, and to find factors of influence on properties of such materials. The kinetic aspects of P3MT formation in the process of 3-methylthiophene (3MT) polymerization in PVDF dispersions in the presence of dopants of different nature, in particular, chloride (Cl-), as well as surface-active dodecylbenzenesulfonate (DBS-) and perfluorooctanoate (PFO-) anions are studied. It is found that DBS- and PFO- anions inhibit 3MT oxidation and decrease P3MT yield in comparison with those of chloride anions. It is shown that P3MT is formed through two consecutive kinetically different reactions of pseudo-first order in terms of the oxidant concentration. Transmission electron microscopy revealed that as a result of such polymerization nanoparticles of doped P3MT formed a surface inhomogeneous layer on PVDF particles, thus forming nanocomposite particles with core-shell morphology. Thermal studies showed higher thermal stability of the doped P3MT phase in the nanocomposite compared to the pure polymer. It is found that thermal stability of the P3MT phase in the PVDF/P3MT-DBS nanocomposites is higher than in the PVDF/P3MT-Cl. The influence of the dopant nature and content of doped P3MT on conductivity and sensitivity of the nanocomposites to vapors of harmful volatile organic compounds (acetone and isopropanol) is characterized. The strongest responses to acetone are shown by the nanocomposite with PFO- dopant. In the DBS- dopant case medium intensity responses are found and the lowest ones are observed for Cl- dopant. It is shown that the sensitivity of nanocomposites extremely depends on the conducting polymer content.
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"TABLE 3 EL Efficiencies of the P30T/PVK". In Photonic Polymer Systems, 275–88. CRC Press, 1998. http://dx.doi.org/10.1201/9781482269970-14.

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de Sá, Sankler Soares, Fernando Costa Basílio, Henrique de Santana, Alexandre Marletta e Eralci Moreira Therézio. "Electrochemical Deposition of P3AT Films Used as a Probe of Optical Properties in Polymeric System". In Modern Technologies for Creating the Thin-film Systems and Coatings. InTech, 2017. http://dx.doi.org/10.5772/66921.

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Trabalhos de conferências sobre o assunto "P3HT polymer"

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Wone, T. K. S., Y. L. Lam, Y. C. Chan, X. Hu e H. Liu. "Ultraviolet Laser Lithography of Conjugated Polythiophene Thin Films". In The European Conference on Lasers and Electro-Optics. Washington, D.C.: Optica Publishing Group, 1998. http://dx.doi.org/10.1364/cleo_europe.1998.cthh79.

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The lithographic patterning of conjugated polymer thin films is important for both device applications such as light emitting diodes and for microlithography. Previous patterning methods which include selective photoelectrochemical deposition and scanning electrochemical microscopy were limited by either the small size of the pattern or the need for photoconductive substrates. In this presentation, we demonstrate that conjugated polymers from the polythiophene series can be patterned directly (without resist) by using the 325nm ultraviolet (UV) radiation from a helium cadmium (He-Cd) laser. These results are an extension of the previous work by Abdou et al [1] and Hu et al [2] on laser irradiation effects on the polythiophenes. Four polymers: polythiophene (PTh), poly (3-methylthiophene) (P3MT), poly (3-butylthiophene) (P3BT) and poly (3-hexylthiophene) (P3HT) were prepared. Both PTh and P3MT were deposited electrochemicallv onto indium tin oxide (ITO) coated glass substrates. The substituted polythiophenes, P3BT and P3HT were synthesized chemically by Grignard coupling and oxidative polymerisation and were dissolved in chloroform to form dilute solutions. Thin films of P3BT and P3HT about 100nm thick were obtained by the dip coating technique. Lithographic patterning was performed using a custom-built UV laser writing system. The He-Cd laser has an output power of 15mW and the power intensity at focus is 286kWcm−2. After line patterns were written, the samples were observed by optical microscopy and atomic force microscopy (AFM). It was found that at sufficiently high incident fluences, all four polymers can be ablated directly into grooves several microns wide and up to 500µm long. The groove widths generally changed slightly with fluence but decreased rapidly near the respective cutoff fluences where no grooves could be formed (Fig. 1). At fluences below about 105 Wem−2, cross-linking was observed in both P3BT and P3HT Films. This renders the irradiated areas insoluble in chloroform and after development in this solvent, line structures 1-6µm wide were found on the glass substrate. Some of these line structures had rippled sidewalls and were attributed to solvent infusion effects. The significance of the present results is that both positive and negative tone lithographic patterning have been demonstrated. The ablation of PTh and P3MT in particular overcomes the difficulty of patterning these insoluble and infusible polymers. The mechanisms of the observed patterning processes will be explained and the linewidth trends shown in Fig.1 and other experiments will be discussed. This direct-write process should have potential applications in polythiophene based devices and conductive resists.
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Liu, Chin-Yi, e Uwe R. Kortshagen. "Hybrid Solar Cells From Silicon Nanocrystals and Conductive Polymers". In ASME 2009 3rd International Conference on Energy Sustainability collocated with the Heat Transfer and InterPACK09 Conferences. ASMEDC, 2009. http://dx.doi.org/10.1115/es2009-90322.

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Hybrid solar cells based on blends of a conjugated polymer, poly-3(hexylthiophene) (P3HT), and silicon nanocrystals (Si NCs) have been developed and characterized. The properties of composite Si NCs/P3HT films which were spun from 1, 2-dichlorobenzene were studied. Under A.M. 1.5 direct illumination conditions (100mW/cm2), devices made with 50wt% 3–5nm Si NCs showed 1.33% power conversion efficiency (PCE) and had a 30% incident-photon-to-current conversion efficiency at 470 nm.
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Surpyanto, Agus, Fahru Nurosyid, Yofentina Iriani, Kuwat Triyana e Ari H. Ramelan. "Characterization of Solar Cells Based Natural Chlorophyll and P3HT Polymer". In 2014 International Conference on Physics and its Applications. Paris, France: Atlantis Press, 2015. http://dx.doi.org/10.2991/icopia-14.2015.32.

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Alanazi, Ahmed, e James H. Rice. "P3HT: PCBm organic polymer supported plasmonic photo-catalysis and sensing." In Organic Electronics and Photonics: Fundamentals and Devices III, editado por Sebastian Reineke, Koen Vandewal e Wouter Maes. SPIE, 2022. http://dx.doi.org/10.1117/12.2632153.

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Peters, V. N., M. O. Faruk, R. Alexander, D. A. Peters e M. A. Noginov. "Effect of Strong Coupling on Photodegradation of the p3ht Semiconducting Polymer". In CLEO: QELS_Fundamental Science. Washington, D.C.: OSA, 2017. http://dx.doi.org/10.1364/cleo_qels.2017.ftu4g.6.

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Domakonda, S., L. Gouti, S. Earles, C. Baum, S. Ramesh e K. Mitra. "Characterization of Hybrid-Nano Polymer Solar Cell". In ASME 2009 International Mechanical Engineering Congress and Exposition. ASMEDC, 2009. http://dx.doi.org/10.1115/imece2009-12895.

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The efficiency of hybrid solar cell depends mainly on the exciton dissociation efficiency and charge mobility. The exciton dissociation efficiency can be improved by increasing the interfacial area between the nanoparticles and polymer. Charge mobility can be improved by proper distribution of nanoparticles in polymer to form better permitting path of each material. Both these parameters are strongly dependant on better distribution of nanoparticles in the polymer. The approach used in this research is the application of star dispersant to the photo active layer, specifically designed for conducting polymers. This dispersant will modify the arms of conducting polymer to have a high compatibility with nanoparticles and provide better distribution. The patterning of these polymers is achieved by wet etching process. Finally, Indium is used as a contact between P3HT and ITO to measure voltage and current characteristics. A number of specimens are prepared with and without the introduction of star dispersant. Absorption spectrum analysis and Photoluminescence (PL) measurements are performed to characterize the optical properties of active layer. Parametric study involving influence of the nano-composite film morphology with and without star dispersant for Photoluminescence measurement and I-V characteristics of hybrid nano-polymer solar cells have been studied. Structural characterization revealed that with the application of the dispersant, better mixing of the nanoparticles and the polymer can be achieved. This will in turn increase the interface area and improve exciton dissociation.
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Darwis, Darmawati, Daniel Elkington, Syahrul Ulum, Andrew Stapleton, Glenn Bryant, Xiaojing Zhou, Warwick Belcher, Paul Dastoor, Ferry Iskandar e Mikrajuddin Abdullah. "High-Performance Thin Film Transistor from Solution-Processed P3HT Polymer Semiconductor Nanoparticles". In THE 4TH NANOSCIENCE AND NANOTECHNOLOGY SYMPOSIUM (NNS2011): An International Symposium. AIP, 2011. http://dx.doi.org/10.1063/1.3667237.

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Suresh, D. S., S. Veeresh, H. Ganesh, Y. S. Nagaraju, S. P. Vijaykumar, Sapna Sharanappa e H. Devendrappa. "Synthesis, characterization of cadmium sulfide doped polymer P3HT for energy storage applications". In 66TH DAE SOLID STATE PHYSICS SYMPOSIUM. AIP Publishing, 2024. http://dx.doi.org/10.1063/5.0178459.

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Li, Weimin, Jinchuan Guo, Xiuquan Sun e Bin Zhou. "Improvement of power efficiency of polymer solar cell based on P3HT: PCBM blends". In Photonics Asia 2007, editado por Yuwen Zhao, Nuofu Chen, Vladimir M. Andreev, Jai Singh, Jinmin Li, Ling Wu, Yubo Fan, Yong-Hang Zhang e Michael E. Coltrin. SPIE, 2007. http://dx.doi.org/10.1117/12.756572.

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Kelkar, Rohit, Satwik Timmavajjala, Kunal Mitra e Clayton Baum. "Fabrication and Characterization of Hybrid Nano-Polymer Solar Cells". In ASME 2011 International Mechanical Engineering Congress and Exposition. ASMEDC, 2011. http://dx.doi.org/10.1115/imece2011-65546.

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Hybrid solar cells consist of organic as well as inorganic substances. An organic compound absorbs light and transports holes whereas an inorganic compound is an acceptor and transports electrons. Hybrid solar cells were fabricated on glass slides pre-coated with indium tin oxide (ITO) which itself acts as a cathode. Poly(3,4 ethylenedioxythiophene)polystyrenesulfonate (PEDOT:PSS) was coated in order to avoid a short circuit between the layers and also to smooth the surface of ITO. A photoactive layer which consisted of poly(3-hexathiophene) (P3HT), TiO2 and star dispersant was coated over the PEDOT:PSS layer. Gold/molybdenum was sputtered as an anode material. Star dispersant was added to the active layer in order to improve the performance of the solar cell. Introduction of star dispersant increases the interfacial area and in turn the exciton dissociation. Atomic force microscopy (AFM) was used to measure the thicknesses of the individual layers and also to obtain a topographical view of the cell surface to ensure the uniformity of the deposited layers. Absorption and photoluminescence spectra were measured to characterize the solar cell. Finally, current–voltage characteristics were measured to ensure that the solar cell acts as a diode.
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