Concentration effects on the thermally-activated transport of polarons in conducting polymers

Ribeiro, Luiz Antônio; Castro, Leonardo Luiz e; Sousa, Leonardo Evaristo de; Silva, Geraldo Magela e; Neto, Pedro Henrique de Oliveira

doi:10.1016/j.cplett.2018.12.033

Cited by 6 publications

(3 citation statements)

References 35 publications

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“…The stability of STE declined with the increasing density, causing the further transformation of STE into FE or FC . Therefore, high STE density likely increases the carrier mobility on account of the collective polaron behavior, which is vastly noticed in OPV materials and graphene. , …”

Section: Resultsmentioning

confidence: 99%

Perovskite Micro-Nano Cage SrTiO₃: Formation Mechanism, Vacancy Analysis, and Exciton Dynamics

et al. 2022

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In the former research, we produced the regular polyhedron single-crystalline SrTiO3 particles with multiple crystal facets exposed by a one-step hydrothermal method. In this work, the dissolution process mechanism of SrTiO3 has been analyzed based on the evidence of the crystal structure and particle morphology with a completely new point of view. The anisotropic formation process of perovskite micro-nano cage SrTiO3 was primarily summarized, and the defective vacancy composition was analyzed. Simultaneously, based on femtosecond transient absorption spectroscopy, the exciton dynamic of SrTiO3 was deduced, and it will play a key role in improving the photoelectric properties of SrTiO3. Furthermore, the abundant defective vacancies promote the ability of SrTiO3 to oxidize Co species, which has a great advantage in the wastewater treatment processes.

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Section: Resultsmentioning

confidence: 99%

Perovskite Micro-Nano Cage SrTiO₃: Formation Mechanism, Vacancy Analysis, and Exciton Dynamics

et al. 2022

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“…Therefore, more STEs can be dissociated into FEs or free carriers. (2) A larger STE density may increase the carrier mobility due to the collective polaron behavior, which is widely observed in OPV materials and graphene. , In iso-BAPB, however, the PL decay remains independent of excitation intensity. One possible reason is the larger trap density in iso-BAPB SCs (for a detailed calculation, see Supporting Information Section S7).…”

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confidence: 99%

Free Carriers versus Self-Trapped Excitons at Different Facets of Ruddlesden–Popper Two-Dimensional Lead Halide Perovskite Single Crystals

Liang

Lin

Zhao

et al. 2021

J. Phys. Chem. Lett.

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The physical origin of sub-band gap photoluminescence in Ruddlesden–Poppers two-dimensional (2D) lead halide perovskites (LHPs) is still under debate. In this paper, we studied the photoluminescence features from two different facets of 2D LHP single crystals: the in-plane facet (IF) containing the 2D inorganic layers and the facet perpendicular to the 2D layers (PF). At the IF, the free carriers (FCs) dominate due to the weak electron–phonon coupling in a symmetric lattice. At the PF, the strain accumulation along the 2D layers enhances the electron–phonon coupling and facilitates self-trapped exciton (STE) formation. The time-resolved PL studies indicate that free carriers (FCs) at the IF can move freely and display the trapping by the intrinsic defects. The STEs at the PF are not likely trapped by the defects due to the reduced mobility. However, with increasing STE density, the STE transport is promoted, enabling the trapping of STE by the intrinsic defects.

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“…Theoretically, Sousa et al investigated temperature effects on exciton diffusion in α-sexithiophene (6T) and para -hexaphenyl (P6P) nanofibers with the kinetic Monte Carlo simulation, and it is obtained that both materials present different temperature sensitivities . In addition, Silva’s group made a series of dynamic calculations on polaron recombination and polaron and exciton diffusion based on the tight binding model, in which the thermal effect was included with a random force on the lattice sites. − They concluded that an exciton can acquire a higher speed and be able to diffuse more within the system with a higher temperature.…”

Section: Introductionmentioning

confidence: 99%

Thermally Induced Exciton Diffusion and Dissociation in Organic Semiconductors

Gao

et al. 2019

J. Phys. Chem. C

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By introducing the thermal effect on π-electrons with Fermi−Dirac distribution and atomic nuclei with Boltzmann distribution, we study exciton diffusion and dissociation in an organic polymer with nonuniform temperature distribution in the framework of the tight-binding model. It is found that the thermal effect can make the electron−hole separation in an exciton, and the separation becomes apparent with increasing temperature. Especially, by applying a lineargradient temperature distribution along the polymer, we further study the nonuniform thermal field on the exciton behaviors. We obtain that the exciton will migrate along the chain with the direction toward the high-temperature region. Based on this, we propose a physical mechanism for a built-in thermal field to assist exciton diffusion and dissociation, which provides a new tunneling to enhance the efficiency of organic solar cells.

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Concentration effects on the thermally-activated transport of polarons in conducting polymers

Cited by 6 publications

References 35 publications

Perovskite Micro-Nano Cage SrTiO₃: Formation Mechanism, Vacancy Analysis, and Exciton Dynamics

Perovskite Micro-Nano Cage SrTiO₃: Formation Mechanism, Vacancy Analysis, and Exciton Dynamics

Free Carriers versus Self-Trapped Excitons at Different Facets of Ruddlesden–Popper Two-Dimensional Lead Halide Perovskite Single Crystals

Thermally Induced Exciton Diffusion and Dissociation in Organic Semiconductors

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Concentration effects on the thermally-activated transport of polarons in conducting polymers

Cited by 6 publications

References 35 publications

Perovskite Micro-Nano Cage SrTiO3: Formation Mechanism, Vacancy Analysis, and Exciton Dynamics

Perovskite Micro-Nano Cage SrTiO3: Formation Mechanism, Vacancy Analysis, and Exciton Dynamics

Free Carriers versus Self-Trapped Excitons at Different Facets of Ruddlesden–Popper Two-Dimensional Lead Halide Perovskite Single Crystals

Thermally Induced Exciton Diffusion and Dissociation in Organic Semiconductors

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Product

Resources

About

Perovskite Micro-Nano Cage SrTiO₃: Formation Mechanism, Vacancy Analysis, and Exciton Dynamics

Perovskite Micro-Nano Cage SrTiO₃: Formation Mechanism, Vacancy Analysis, and Exciton Dynamics