How Many Parameters Actually Affect the Mobility of Conjugated Polymers?

Fornari, Rocco Peter; Blom, Paul W. M.; Troisi, Alessandro

doi:10.1103/physrevlett.118.086601

Cited by 48 publications

(59 citation statements)

References 26 publications

(35 reference statements)

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“…80 ). Approaches based on model Hamiltonians have also provided powerful insight into the key processes and factors that govern charge transport in high-mobility polymer systems, such as how dynamic disorder mediates the hopping between states defined by static disorder 82 , the influence of bandwidth in D-A copolymers on carrier mobility 83 and the identification of the most important parameters governing mobilities 84 . A particularly important insight has been the realization of the significance of delocalized states that Figure repoduced with permission from ref.…”

Section: Charge Transport In Low-disorder Conjugated Polymersmentioning

confidence: 99%

Charge transport in high-mobility conjugated polymers and molecular semiconductors

et al. 2020

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Conjugated polymers and molecular semiconductors are emerging as a viable semiconductor technology in industries such as displays, electronics, renewable energy, sensing and healthcare. A key enabling factor has been significant scientific progress in improving their charge transport properties and carrier mobilities, which has been made possible by a better understanding of the molecular structure-property relationships and the underpinning charge transport physics. Here we aim to present a coherent review of how we understand charge transport in these high-mobility van der Waals bonded semiconductors. Specific questions of interest include estimates for intrinsic limits to the carrier mobilities that might ultimately be achievable; a discussion of the coupling between charge and structural dynamics; the importance of molecular conformations and mesoscale structural features; how the transport physics of conjugated polymers and small molecule semiconductors are related; and how the incorporation of counterions in doped films-as used, for example, in bioelectronics and thermoelectric devices-affects the electronic structure and charge transport properties.

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Section: Charge Transport In Low-disorder Conjugated Polymersmentioning

confidence: 99%

Charge transport in high-mobility conjugated polymers and molecular semiconductors

et al. 2020

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“…In identifying the difficulty of predicting the interaction between dopants and OSCs, we point out that modeling this system at the molecular scale requires both electronic (usually, density functional theory (DFT)) and structural (usually, molecular dynamics) components and that development of multiscale models combining these levels of theory is at the leading edge of theoretical capabilities . We encourage more research in this area.…”

Section: Fabrication and Morphologymentioning

confidence: 99%

Controlling Molecular Doping in Organic Semiconductors

2017

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The field of organic electronics thrives on the hope of enabling low-cost, solution-processed electronic devices with mechanical, optoelectronic, and chemical properties not available from inorganic semiconductors. A key to the success of these aspirations is the ability to controllably dope organic semiconductors with high spatial resolution. Here, recent progress in molecular doping of organic semiconductors is summarized, with an emphasis on solution-processed p-type doped polymeric semiconductors. Highlighted topics include how solution-processing techniques can control the distribution, diffusion, and density of dopants within the organic semiconductor, and, in turn, affect the electronic properties of the material. Research in these areas has recently intensified, thanks to advances in chemical synthesis, improved understanding of charged states in organic materials, and a focus on relating fabrication techniques to morphology. Significant disorder in these systems, along with complex interactions between doping and film morphology, is often responsible for charge trapping and low doping efficiency. However, the strong coupling between doping, solubility, and morphology can be harnessed to control crystallinity, create doping gradients, and pattern polymers. These breakthroughs suggest a role for molecular doping not only in device function but also in fabrication-applications beyond those directly analogous to inorganic doping.

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“…where q is the electric charge, N the carrier concentration and μ the charge carrier mobility. The carrier concentration is related to the filling (doping) and shape of the density of states (DoS) of the material [9 12], while the charge carrier mobility is linked to the shape of the DoS for conducting poly mers for which the dominant charge transport mechanism is hopping [12,13]. On the other hand, following Mott's formalism, the Seebeck coefficient is related to conductivity through Equation (2) and, there fore, S is also dependent on the DoS slope at the Fermi level, E f ; a steeper slope leading to a higher Seebeck coefficient [14,15].…”

Section: Introductionmentioning

confidence: 99%

Correlating the Seebeck coefficient of thermoelectric polymer thin films to their charge transport mechanism

Petsagkourakis

Pavlopoulou

Cloutet

et al. 2018

Organic Electronics

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Room temperature flexible heat harvesters based on conducting polymers are ideally suited to cover the energy demands of the modern nomadic society. The optimization of their thermoelectric efficiency is usually sought by tuning the oxidation levels of the conducting polymers, even if such methodology is detrimental to the Seebeck coefficient (S) as both the Seebeck coefficient and the electrical conductivity (σ) are antagonistically related to the carrier concentration. Here we report a concurrent increase of S and σ and we experimentally derive the dependence of Seebeck coefficient on charge carrier mobility for the first time in organic electronics. Through specific control of the conducting polymer synthesis, we enabled the formation of a denser percolation network that facilitated the charge transport and the thermodiffusion of the charge carriers inside the conducting polymer layer, while the material shifted from a Fermi glass towards a semi-metal, as its crystallinity increased. This work sheds light upon the origin of the thermoelectric properties of conducting polymers, but also underlines the importance of enhanced charge carrier mobility for the design of efficient thermoelectric polymers.

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How Many Parameters Actually Affect the Mobility of Conjugated Polymers?

Cited by 48 publications

References 26 publications

Charge transport in high-mobility conjugated polymers and molecular semiconductors

Charge transport in high-mobility conjugated polymers and molecular semiconductors

Controlling Molecular Doping in Organic Semiconductors

Correlating the Seebeck coefficient of thermoelectric polymer thin films to their charge transport mechanism

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