Electrical properties of V2O5 thin films obtained by atomic layer deposition (ALD)

Badot, Jean-Claude; Mantoux, A.; Baffier, N.; Dubrunfaut, Olivier; Lincot, Daniel

doi:10.1039/b410324f

Cited by 69 publications

(59 citation statements)

References 36 publications

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“…Several polarization mechanisms at different scales with distinct characteristic frequencies can be separated and treated individually. When the frequency increases, different kinds of polarization appear in following order: a) interfacial polarization due to the existence of cluster and particle boundaries, [22][23][24][25] which give rise to relaxations in the low-frequency domain; and b) orientational polarization due to local charge motions (e.g., small polarons hopping in oxides), [22][23][24][25][26][27][28][29] which give rise to relaxations in the radio-and microwave frequency domains. The composite electrodes studied here were thoroughly characterized in our previous work.…”

Section: Introductionmentioning

confidence: 99%

A Multiscale Description of the Electronic Transport within the Hierarchical Architecture of a Composite Electrode for Lithium Batteries

Badot

Ligneel

Dubrunfaut

et al. 2009

Adv Funct Materials

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International audienceThe broadband dielectric spectroscopy technique is applied, for the first time, to a composite material used as an electrode for lithium battery. The electrical properties (permittivity and conductivity) are measured from low (a few Hz) to microwave (a few GHz) frequencies. The results demonstrate that the broadband dielectric spectroscopy technique is very sensitive to the different scales of the electrode architecture involved in electronic transport, from interatomic distances to macroscopic sizes, as well as to the morphology at these scales, coarse or fine distribution of the constituents. This work opens up new prospects for a more fundamental understanding and more rational optimization of the electronic transport in composite electrodes for lithium batteries and other electrochemical energy storage technologies (including other batteries, supercapacitors, low- and medium-temperature fuel cells), electrochemical sensors and conductor-insulator composite materials

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Section: Introductionmentioning

confidence: 99%

A Multiscale Description of the Electronic Transport within the Hierarchical Architecture of a Composite Electrode for Lithium Batteries

Badot

Ligneel

Dubrunfaut

et al. 2009

Adv Funct Materials

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“…V 2 O 5 fi lms were, for example, deposited by solgel methods, [ 78 , 79 ] RF sputter deposition, [ 80 ] pulsed laser deposition, [ 81 , 82 ] chemical vapor deposition [ 83 ] and atomic layer deposition. [ 84 ] Similar methods could also be used for the deposition Various deposition techniques have been demonstrated for LLTO fi lms, although most of these fi lms show a signifi cantly lower ionic conductivity than bulk materials. Reported deposition techniques include e-beam evaporation [ 108 ] and sol-gel deposition.…”

Section: Vanadium Oxidesmentioning

confidence: 99%

All‐Solid‐State Lithium‐Ion Microbatteries: A Review of Various Three‐Dimensional Concepts

Oudenhoven

Baggetto

Notten

2010

Advanced Energy Materials

702

638

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With the increasing importance of wireless microelectronic devices the need for on-board power supplies is evidently also increasing. Possible candidates for microenergy storage devices are planar all-solid-state Li-ion microbatteries, which are currently under development by several start-up companies. However, to increase the energy density of these microbatteries further and to ensure a high power delivery, three-dimensional (3D) designs are essential. Therefore, several concepts have been proposed for the design of 3D microbatteries and these are reviewed. In addition, an overview is given of the various electrode and electrolyte materials that are suitable for 3D all-solidstate microbatteries. Furthermore, methods are presented to produce fi lms of these materials on a nano-and microscale.www.MaterialsViews.com REVIEW www.advenergymat.de

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“…This conductivity is somewhat less than that of V 2 O 5 layers prepared by atomic layer deposition (ALD). [ 29 ] It is well known that for nominally identical TMOs the conductivity may vary by orders of magnitude owing to the particular transport mechanism in TMO, which strongly depends on the content of partially reduced metal cations. [ 30 ] On the other hand, the current-voltage characteristics of the solar cells in forward direction do not indicate an increased series resistance or a decay of the FF for cells with thicker sol-gel V 2 O 5 layers.…”

mentioning

confidence: 99%

Solution Processed Vanadium Pentoxide as Charge Extraction Layer for Organic Solar Cells

Zilberberg

Trost

Schmidt

et al. 2011

Advanced Energy Materials

249

234

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Organic solar cells (OSCs) based on polymers and small molecules have seen a tremendous increase in interest during the past few years. Signifi cant progress in this fi eld seeded the prospect for a cost-effective and easy-to-fabricate photovoltaic technology-typical advantages claimed for organic (opto-)electronic devices. Very recently, certifi ed cell effi ciencies in excess of 7% have been reported for polymer based cells. [ 1 ] For large-scale and high-throughput production of OSCs, liquid processing of the functional layers is desirable. Aside from the active organic layers, inter-layers are typically required to facilitate the extraction of the photo-generated charges. Specifi cally, on the anode side, polyethylene dioxythiophene:polystyrenesulfonate (PEDOT:PSS) is regularly used. [ 2 ] However, PEDOT:PSS is burdened with structural and electrical inhomogeneity [ 3,4 ] and has been demonstrated to be an origin of limited device lifetime. [ 5 ] Particularly, the aqueous PEDOT:PSS dispersion and the acidic nature can cause substantial degradation. [6,7 ] Very recently, transition metal-oxides (TMOs) such as molybdenum-, vanadium-, or tungsten-oxide (MoO 3 , V 2 O 5 , and WO 3 ) with high work functions (WFs) of up to 6.9 eV have been shown to be promising alternatives to PEDOT:PSS. [8][9][10][11] TMOs have also been used as constituents of the connecting architecture in stacked organic light-emitting diodes and organic tandem solar cells. [12][13][14][15] The unique energetics of these TMOs has so far been predominantly accessible for fi lms thermally evaporated in high-vacuum.The fi rst results for TMO layers obtained by solution processing from nano-particle (NP) dispersions have been reported only very recently. [ 16,17 ] Meyer et al. prepared MoO 3 layers by dispersing MoO 3 NPs using a polymer as dispersing agent. After deposition, the layers had to be treated by an oxygen plasma to remove the polymer. A high WF of the resulting layers of 5.7-6 eV was obtained. A substantial drawback of the approach, however, is the observation of larger NP aggregates with a size of 100 nm and an overall high roughness of 25 nm (rms). Owing to their roughness these NP-layers are critical sources of shorts, especially over a large device area.In contrast, TMO layers (WO 3 , V 2 O 5 and MoO 3 ) have been prepared by sol-gel deposition, predominantly for electrochromic, catalytic and sensing applications. [18][19][20][21] Post processing of the sol-gel TMO layers at high temperatures (300 ° C-600 ° C) is routinely applied in order to achieve specifi c microstructures or crystalline phases in the materials, as required by the particular application. These high processing temperatures are not compatible with the temperature-sensitive substrates (e.g. poly mer foils) envisaged for low-cost, high-throughput fabrication of organic solar cells. In spite of this limitation, Steirer et al. have very recently used NiO prepared via a sol-gel route as a replacement for PEDOT:PSS in an organic solar cell. [ 22 ] The requirement of pos...

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Electrical properties of V2O5 thin films obtained by atomic layer deposition (ALD)

Cited by 69 publications

References 36 publications

A Multiscale Description of the Electronic Transport within the Hierarchical Architecture of a Composite Electrode for Lithium Batteries

A Multiscale Description of the Electronic Transport within the Hierarchical Architecture of a Composite Electrode for Lithium Batteries

All‐Solid‐State Lithium‐Ion Microbatteries: A Review of Various Three‐Dimensional Concepts

Solution Processed Vanadium Pentoxide as Charge Extraction Layer for Organic Solar Cells

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