Structural-electrical-optical properties relationship of sodium superionic conductor sputter-deposited coatings

Horwat, David; Pierson, J.F.; Billard, Alain

doi:10.1016/j.tsf.2007.10.086

Cited by 4 publications

(5 citation statements)

References 15 publications

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“…6, see the conductivity drop during the first heating cycle). The less pronounced diffusion wing [17] resulting from this event is consistent with a higher local order of the amorphous phase. After this reorganisation, the room temperature ionic conductivity raised from~3.10 −5 S cm −1 up to~2.10 -3 S cm −1 .…”

Section: Resultssupporting

confidence: 59%

“…5b) and homogeneity of the deposited films were observed thanks to high-frequency pulsed DC sputtering (200 to 350 kHz) of the Na 3 PO 4 target [15,16]. As deposited films are amorphous and reorganise after air annealing near 300°C before a crystallisation under a NASICON phase near 700°C [15][16][17]. The ionic conductivity seems to be influenced by the structural reorganisation in the glassy state (Fig.…”

Section: Resultsmentioning

confidence: 95%

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Towards a thin films electrochromic device using NASICON electrolyte

Horwat

Pierson

Billard

2007

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The optimisation of the morphology of WO 3 thin films allowed a more efficient electrochromic colouring using Na + ions than H + ones. Therefore, sodium superionic conductor (Na 3 Zr 2 Si 2 PO 12 , NASICON) films may be used as electrolyte in inorganic electrochromic devices. In this paper, the structure, chemical composition, morphology and electrochromic properties of WO 3 , ZnO:Al and Na 3 Zr 2-Si 2 PO 12 thin films were studied to develop a novel type of electrochromic device. WO 3 , ZnO:Al and Na 3 Zr 2 Si 2 PO 12 thin films were deposited using reactive magnetron sputtering of tungsten, zinc and aluminium and Zr-Si and Na 3 PO 4 targets, respectively. For transparent conductive oxide coatings, a correlation was established between the deposition parametres and the film's structure, transmittance and electrical resistivity. Classical sputtering methods were not suitable for the deposition of NASICON films on large surface with homogenous composition. On the other hand, the use of high-frequency pulsed direct current generators allowed the deposition of amorphous films that crystallised after thermal annealing upon 700°C in the Na 3 Zr 2 Si 2 PO 12 structure. Amorphous films exhibited ionic conductivity close to 2×10 −3 S cm −1 . Finally, preliminary results related to the electrochromic performance of NASICON, WO 3 and indium tin oxide devices were given.

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Section: Resultssupporting

confidence: 59%

Section: Resultsmentioning

confidence: 95%

Towards a thin films electrochromic device using NASICON electrolyte

Horwat

Pierson

Billard

2007

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“…While there have been many studies concerning the preparation and properties of bulk ceramics of NaSICon (see for example references 8 and 9 and references therein), to date there have been limited studies on the preparation of thin films of NaSICon. Deposition methods that have been explored include chemical solution deposition, [10][11][12][13] sputtering, [14][15][16] E-beam evaporation, 16 and pulsed-laser ablation. 17 Of these reports, few have rigorously demonstrated correct phase assignment and clean evidence of sodium ion conduction.…”

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confidence: 99%

Preparation and Processing Temperature Effects on Ion Conductivity in Solution Derived Sodium Zirconium Phosphate (NaZr₂P₃O₁₂) Thin Films

Meier¹,

Apblett²,

Ingersoll³

et al. 2014

J. Electrochem. Soc.

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Sodium zirconium phosphate, NaZr 2 P 3 O 12 , thin films have been prepared via a chemical solution approach on platinized silicon substrates. The films are observed to crystallize at temperatures in excess of 725 • C and are highly 012-textured. Film grain size scales with processing temperature with grain sizes of 96 to 142 nm measured for films processed at 750 • C to 800 • C, respectively. Room temperature sodium-ion conductivity also scales with processing temperature with values of 3.5 × 10 −7 to 5.1 × 10 −7 S/cm measured. Activation energies for sodium-ion conduction measured from room temperature to 150 • C were invariant with processing condition and are approximately 0.49 eV. The ionic conductivity and activation energy values agree well with bulk ceramic reference data and thus demonstrate that sodium super ionic conducting thin films with bulk-like properties are possible in thin film embodiments.

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“…It is also noticeable that the determined D values for Na + cation (10 −11 to 10 −12 cm².s −1 ) are close to those reported for Li + (10 −9 to 10 −12 cm 2 .s −1 ) [24,54,55,27] or also K + (10 −11 cm 2 .s −1 ) [19], in the same WO 3 matrix. For the case C, the conductivity of the amorphous NASICON layer was evaluated to be close to 3.10 −5 S.cm −1 [35]. D values for crystalline NASICON of 2.10 −3 S.cm −1 were evaluated to 5.10 −10 cm 2 .s −1 [56].…”

Section: Discussionmentioning

confidence: 99%

“…300 nm was deposited on WO 3 using Zr-Si and Na 3 PO 4 target following the procedure described in Refs. [34,35].…”

Section: Preparation Of the Wo 3 Filmsmentioning

confidence: 99%

Towards enhanced durability of electrochromic WO3 interfaced with liquid or ceramic sodium-based electrolytes

Zimmer

Tresse

Stein

et al. 2020

Electrochimica Acta

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The reversible intercalation of sodium ion into tungsten oxide WO 3 appears as an interesting alternative to hydrogen or lithium ion reduction in order to get the characteristic transition from clear transparent to bluish coloration in electrochromic devices, but it has been comparatively less considered. In order to address further viable all-ceramic devices based on sodium ion intercalation and overcome the issue of WO 3 degradation in aqueous media, three configurations of WO 3 thin film-based electrochromic half-cells were tested, namely in (i) aqueous acidified Na 2 SO 4 electrolyte, (ii) room temperature ionic liquid BEPipTFSI electrolyte and (iii) aqueous acidified Na 2 SO 4 electrolyte associated with an amorphous NASICON-cap onto WO 3 film. We compared their electro-optical characteristics during 100 voltammetry cycles, including the Na + diffusion coefficient calculated through electrochemical method. It is found that sputter-deposited amorphous WO 3 thin films on transparent conductive substrates is promising for electrochromic all-ceramic devices based on Na ion insertion. Electrochemical characterization in aqueous medium is not relevant to extract relevant data when WO 3 is in direct contact with the electrolyte as the electrochromic film is progressively dissolved. In contrast, WO 3 capped with oxide amorphous Na-ion conductor readily operates over 100 cycles, the capping layer preventing degradation by the aqueous medium. Alternatively, ionic liquid does not degrade the WO 3 film and can be employed to efficiently characterize the electro-optical performances.

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Structural-electrical-optical properties relationship of sodium superionic conductor sputter-deposited coatings

Cited by 4 publications

References 15 publications

Towards a thin films electrochromic device using NASICON electrolyte

Towards a thin films electrochromic device using NASICON electrolyte

Preparation and Processing Temperature Effects on Ion Conductivity in Solution Derived Sodium Zirconium Phosphate (NaZr₂P₃O₁₂) Thin Films

Towards enhanced durability of electrochromic WO3 interfaced with liquid or ceramic sodium-based electrolytes

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Structural-electrical-optical properties relationship of sodium superionic conductor sputter-deposited coatings

Cited by 4 publications

References 15 publications

Towards a thin films electrochromic device using NASICON electrolyte

Towards a thin films electrochromic device using NASICON electrolyte

Preparation and Processing Temperature Effects on Ion Conductivity in Solution Derived Sodium Zirconium Phosphate (NaZr2P3O12) Thin Films

Towards enhanced durability of electrochromic WO3 interfaced with liquid or ceramic sodium-based electrolytes

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Preparation and Processing Temperature Effects on Ion Conductivity in Solution Derived Sodium Zirconium Phosphate (NaZr₂P₃O₁₂) Thin Films