Dimensionality-dependent energy transfer in polymer-intercalated<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mi>SnS</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:mrow></mml:math>nanocomposites

Parkinson, Patrick; Aharon, Eyal; Chang, Ming Chau; Dosche, Carsten; Frey, Gitti L.; Köhler, Anna; Herz, Laura M.

doi:10.1103/physrevb.75.165206

Cited by 19 publications

(7 citation statements)

References 33 publications

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“…α indicates the dimensionality and diffusion dynamics in the density of states of energy transfer [97]. For single step three dimensional FRET, α = 1 / 2, for single step two-dimensional FRET α = 1 / 3 [98] and for diffusive transport only (followed by a final nearest neighbour hop into the acceptor) α = 1 for a simple random walk. In the case of diffusive transport in an inhomogenously broadened density of states [95] α is slightly less than 1 since diffusion slows down with time due to energy relaxation [99].…”

Section: Exciton Harvestingmentioning

confidence: 99%

Organic Solar Cells: Understanding the Role of Förster Resonance Energy Transfer

Feron

Belcher

Fell

et al. 2012

IJMS

111

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Organic solar cells have the potential to become a low-cost sustainable energy source. Understanding the photoconversion mechanism is key to the design of efficient organic solar cells. In this review, we discuss the processes involved in the photo-electron conversion mechanism, which may be subdivided into exciton harvesting, exciton transport, exciton dissociation, charge transport and extraction stages. In particular, we focus on the role of energy transfer as described by Förster resonance energy transfer (FRET) theory in the photoconversion mechanism. FRET plays a major role in exciton transport, harvesting and dissociation. The spectral absorption range of organic solar cells may be extended using sensitizers that efficiently transfer absorbed energy to the photoactive materials. The limitations of Förster theory to accurately calculate energy transfer rates are discussed. Energy transfer is the first step of an efficient two-step exciton dissociation process and may also be used to preferentially transport excitons to the heterointerface, where efficient exciton dissociation may occur. However, FRET also competes with charge transfer at the heterointerface turning it in a potential loss mechanism. An energy cascade comprising both energy transfer and charge transfer may aid in separating charges and is briefly discussed. Considering the extent to which the photo-electron conversion efficiency is governed by energy transfer, optimisation of this process offers the prospect of improved organic photovoltaic performance and thus aids in realising the potential of organic solar cells.

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Section: Exciton Harvestingmentioning

confidence: 99%

Organic Solar Cells: Understanding the Role of Förster Resonance Energy Transfer

Feron

Belcher

Fell

et al. 2012

IJMS

111

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“…[1,[6][7][8] Recently, it was shown that energy transfer in conjugated polymers has strong dependence on dimensionality, with much slower transfer in 1D and 2D systems, in which neighboring polymer chains are weakly or not coupled, compared to 3D films. [9][10][11][12] The slower energy transfer in the low-dimensional systems, that is, polymer monolayers (2D) and isolated polymer chains (1D), was attributed to the absence of the strong chain coupling present in 3D films. The absence of the closely p-p packed polymer chains, known to be the origin of fast energy transfer in 3D films, suppresses the overall rate of energy transfer in the low-dimensional systems.…”

Section: Introductionmentioning

confidence: 99%

“…The absence of the closely p-p packed polymer chains, known to be the origin of fast energy transfer in 3D films, suppresses the overall rate of energy transfer in the low-dimensional systems. [10,12] Recently, stalled energy transfer in 2D systems was utilized for the fabrication of color-controlled [13] and white-emitting PLEDs. [13,14] However, whether 2D energy transfer in conjugated polymer monolayers occurs mainly along polymer chains (intrachain) or between in-plain neighboring but noncoupled polymer chains (interchain) has yet to be determined due to the experimental difficulty of decoupling inter-and intrachain interactions in polymer monolayers.…”

Section: Introductionmentioning

confidence: 99%

“…[10] The polymers incorporated into the SnS 2 matrix in this study are polyfluorenes doped with known concentrations of onchain green-emitting fluorenone chromophores. [16] The strong spectral overlap between the emission of fluorene and the absorption of the fluorenone defects has been shown to induce fluorene-to-fluorenone energy transfer.…”

Section: Introductionmentioning

confidence: 99%

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Decoupling 2D Inter‐ and Intrachain Energy Transfer in Conjugated Polymers

et al. 2009

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The dimensionality of conjugated polymer systems plays an important role in energy-transfer processes, and 1D and 2D energy transfer of excitations are typically much slower than that between pi-stacked chains within a 3D polymeric solid. However, whether 2D energy transfer in conjugated polymers occurs mainly along polymer chains (intrachain), or between in-plain-adjacent polymer chains (interchain), has yet to be determined due to the difficulty of experimentally decoupling inter- and intrachain interaction in a 2D polymer system. This can be achieved by incorporating conjugated polymer chains into the planar galleries of layered matrices which sterically hinder polymer aggregation and pi-pi interchain interactions. Here, pristine blue-emitting polyfluorene chains and polyfluorene chains with known concentrations of green-emitting on-chain fluorenone defects are either separately or collectively incorporated into layered SnS(2). X-ray powder diffraction of the composite films confirms incorporation of the polymer chains into the layered galleries. Monitoring the fluorene-to-fluorenone energy transfer as a function of fluorenone concentration and distribution in the layered galleries allows differentiation between inter- and intrachain fluorene-fluorenone energy transfer. It is found that, 2D energy transfer in conjugated polymers follows mainly an interchain process, despite the absence of pi-pi interchain interactions.

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“…Each single H‐slab layer consists of one layer occupied only by metal atoms on both sides confined by sulphur. Since the binding forces between both slabs are weak the intercalation of additional metal atoms or polymers is possible between them 53–55. Hence, the H‐slab acts as host compound.…”

Section: Structurally Cylindrite Belongs To the Misfit Layer Compomentioning

confidence: 99%

Synthesis and physical properties of cylindrite micro tubes and lamellae

Kaden

Wagner

Sturm

et al. 2010

Physica Status Solidi (b)

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The natural semiconductor cylindrite FeSn 4 Pb 3 Sb 2 S 14 was synthesised by chemical vapour transport (CVT). Crystals with lamellar shape and cylindrical morphology could be deposited on substrates. The endothermic reactions responsible for material transport were simulated by means of thermodynamic modelling. Cylindrite belongs to the class of misfit layered compounds, where its modulated incommensurate crystal structure is based on the regular alternation of two types of layers. The so called T-and H-slab are incommensurately linked. Determined from single crystal XRD measurements, the modulation of atom positions as well as modulation of metal site occupancy of both subsystems are presented. The origin of super structure reflections found in scattering experiments can be clearly explained by a structure model. Based on experimentally determined single crystal XRD data and HRTEM inspections a model is derived to explain the formation of cylindrical architecture of crystals. The specific electrical conductivity of cylindrite improves from 10 TEM bright field image of high magnification demonstrating the continuous bending of (100) layers in a cylindrite cylinder.

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Dimensionality-dependent energy transfer in polymer-intercalatedSnS2nanocomposites

Cited by 19 publications

References 33 publications

Organic Solar Cells: Understanding the Role of Förster Resonance Energy Transfer

Organic Solar Cells: Understanding the Role of Förster Resonance Energy Transfer

Decoupling 2D Inter‐ and Intrachain Energy Transfer in Conjugated Polymers

Synthesis and physical properties of cylindrite micro tubes and lamellae

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