Elastic characterization of poly(3-n.decylpyrrole) thin films by Brillouin light scattering

Cagnolati, R.; Fioretto, D.; Ruggeri, Giacomo; Socino, G.

doi:10.1016/0379-6779(93)91288-d

Cited by 8 publications

(6 citation statements)

References 14 publications

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“…Specically, the values of sound velocity for typical conducting polymers-PEDOT:PSS and poly(3-hexylthiophene) (P3HT)-are 1.58 Â 10 3 and 2.87 Â 10 3 m s À1 , respectively. 26,27 For organic polymers, k L is low and oen lies in the range of 0.1-1.0 W m À1 K À1 , and more importantly k L is independent of the doping level. Enormous studies have shown that point defects from doping, nanostructuring, and heterostructures or alloys which create rich hetero-interfaces and grain boundaries can cause phonon scattering, thus decreasing k L .…”

Section: General Issuesmentioning

confidence: 99%

Solution processed organic thermoelectrics: towards flexible thermoelectric modules

Chen

Zhao

Liang

2015

Energy Environ. Sci.

391

275

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Section: General Issuesmentioning

confidence: 99%

Solution processed organic thermoelectrics: towards flexible thermoelectric modules

Chen

Zhao

Liang

2015

Energy Environ. Sci.

391

275

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“…For instance, the sound velocities of PEDOT:PSS and poly(3-hexylthiophene) (P3HT) are 1.58 3 10 3 and 2.87 3 10 3 m/s, respectively. 51,52 The lattice thermal conductivities of PEDOT:PSS and P3HT are estimated to be $0.3 W/m-K and $0.5 W/m-K. These values lie in the range of reported thermal conductivities of various polymers (0.1-0.7 W/m-K).…”

Section: Key Parameters For Organic Te Materialsmentioning

confidence: 88%

Organic Thermoelectrics: Materials Preparation, Performance Optimization, and Device Integration

Wang

2019

Joule

239

168

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Recent rapid development of inorganic thermoelectric (TE) materials has aroused enthusiasm for exploring low-cost, flexible, lightweight, and non-toxic organic TE materials. Great progress has been achieved in developing organic materials with high TE performance (figure of merit, ZT) over the past decade. However, it is still extremely challenging to obtain organic materials with high TE performance and a ZT over 0.5 because of the strong interrelationship between the three TE parameters: electrical conductivity, Seebeck coefficient, and thermal conductivity. In this review, we discuss current trends in developing strategies to decouple the electrical conductivity, Seebeck coefficient, and thermal conductivity, which to the best of our knowledge have not been discussed in previously published reviews. Methods such as solvent treatment, electrochemical doping, and nanostructure formation are analyzed. In addition, incorrect thermal conductivity values for highly electrically conducting organic materials are still frequently reported, even in papers published in high-impact journals. A description of this puzzling phenomenon is provided in this review. Finally, a discussion of the advantages of state-of-the-art fabrication techniques of organic TE modules is presented, which highlights the unique advantages of organic TE materials in supporting wearable/portable devices.

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“…The dielectric constants for most polymer materials are less than 10ε 0 , − where ε 0 is the vacuum dielectric constant. The sound velocity is usually in the range of 10 3 –10 4 m/s in polymers, ,,, which is about 1–2 orders of magnitude smaller than that in the semiconductors. The parameters used for numerical studies in section III are shown in Table .…”

Section: Theoretical Modelmentioning

confidence: 96%

Thermoelectric Properties of Molecular Nanowires

2011

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Recently there has been an increasing interest in using organic materials for thermoelectric applications due to the noteworthy advantages of mechanical flexibility, low-cost synthesis, and solution processability. While the thermal conductivity of organic semiconductors is known to be small, very few theoretical works are available to predict thermoelectric properties of organic semiconductors and guide experimental efforts. In this work, we studied the thermoelectric properties (electrical conductivity, Seebeck coefficient, and power factor) of quasi-one-dimensional (Q1D) self-assembled molecular nanowires (NWs) based on a rigorous evaluation of the Kubo formula using the Holstein model. The molecular NWs are composed of either one-dimensional conducting polymer chains, coupled by covalent bonds, or linear stacks of planar building blocks, held together by van der Waals or π–π interactions; these are also known as molecule metals (or semiconductors), charge transfer salts, or π-stacked organic semiconductors. The dependence of thermoelectric properties on a variety of physical parameters, including intersite coupling, electron–phonon interaction, chemical potential (doping concentration), and temperature, are systematically studied. We found that the thermoelectric properties are strongly affected by the intersite coupling and the dielectric constant. If the phonon thermal conductivity is assumed to be 0.2 W/mK, the thermoelectric figure of merit (ZT) of a molecular NW can reach 15.2, which is much larger than the best known inorganic thermoelectric materials obtained so far. Finally, we applied our model to study the thermoelectric properties of 1D polymer chains of P3HT and PEDOT:PSS. The power factor reaches 500 μW/cmK for a PEDOT:PSS chain. This study indicates that low-dimensional conducting polymers could be promising high-ZT materials. The theoretical study presented in this work could be useful for guiding the searchfor high-efficiency thermoelectric materials that are potentially low-cost and compatible with environmental-friendly processing.

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Elastic characterization of poly(3-n.decylpyrrole) thin films by Brillouin light scattering

Cited by 8 publications

References 14 publications

Solution processed organic thermoelectrics: towards flexible thermoelectric modules

Solution processed organic thermoelectrics: towards flexible thermoelectric modules

Organic Thermoelectrics: Materials Preparation, Performance Optimization, and Device Integration

Thermoelectric Properties of Molecular Nanowires

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