Electrochemical and optical properties of sputter deposited Ir–Ta and Ir oxide thin films

Backholm, Jonas; Azens, A.; Niklasson, Gunnar A.

doi:10.1016/j.solmat.2005.04.030

Cited by 34 publications

(20 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The voltage sweep rate was 10 mV/s. The data are in overall agreement with earlier ones [1,14]. The main conclusion is that our various films displayed consistent CVs-meaning that the precise magnitude of the O 2 /Ar ratio was not critical-and that the data were qualitatively different for recordings made in aqueous (Figs.…”

Section: Data Are Shown In Figs 4(a)-(c) For Films Immersed In Propisupporting

confidence: 90%

“…Ir oxide has been studied in this context at least since 1978 [10,11], and sputter deposited EC films were reported in 1979 [12]; the early literature has been reviewed in detail [1]. The research field maintains its vitality [13][14][15][16][17][18][19][20]. Concerning durability, we notice that Ir oxide films have undergone EC cycling for up to 7 × 10 6 ion insertion/extraction cycles without significant degradation [21].…”

Section: There Are Two Types Of Ec Thin Films: One Is Called -Cathodimentioning

confidence: 95%

See 1 more Smart Citation

Electrochromic nickel oxide films and their compatibility with potassium hydroxide and lithium perchlorate in propylene carbonate: Optical, electrochemical and stress-related properties

2014

Self Cite

View full text Add to dashboard Cite

Electrochromic nickel oxide films and their compatibility with potassium hydroxide and lithium perchlorate in propylene carbonate: Optical, electrochemical and stress-related properties. AbstractPorous thin films of Ir oxide were prepared by reactive dc magnetron sputtering onto unheated substrates. The crystallite size was ~5 nm, and a small amount of unoxidized Ir was present. The electrochromic performance was studied by optical transmittance measurements and cyclic voltammetry applied to films in aqueous and non-aqueous electrolytes, specifically being 1M propionic acid, 1M potassium hydroxide (KOH), and 1M lithium perchlorate in propylene carbonate (Li-PC). Cyclic voltammetry measurements indicated that the films had a fractal surface structure. Good electrochromism, with mid-luminous transmittance modulation between ~55 and ~90 % in ~100-nm-thick films, was documented in all of the electrolytes.

show abstract

Section: Data Are Shown In Figs 4(a)-(c) For Films Immersed In Propisupporting

confidence: 90%

Section: There Are Two Types Of Ec Thin Films: One Is Called -Cathodimentioning

confidence: 95%

Electrochromic nickel oxide films and their compatibility with potassium hydroxide and lithium perchlorate in propylene carbonate: Optical, electrochemical and stress-related properties

2014

Self Cite

View full text Add to dashboard Cite

show abstract

“…Additional structural characterization by atomic force microscopy, x-ray diffraction, transmission electron microscopy ͑TEM͒, Rutherford backscattering spectroscopy, and x-ray photoelectron spectroscopy of both types of films were presented in two recent papers. 32,33 The compositions of the as-deposited films were IrO 2.2 and IrTa 1.4 O 5.6 , respectively, with a surface roughness of about 9 nm and a grain size of 3 -4 nm for both types of films. Preliminary observations of cross section TEM images show that IrTaOx has a diffuse columnar structure, whereas the IrOx has a more porous structure, which is sensitive to electron beam irradiation.…”

Section: Methodsmentioning

confidence: 99%

“…To improve the electrochromic behavior of iridium oxide, and to make it less expensive for applications, other metals, such as Sn or Ta, are added to obtain a mixed electrochromic oxide. [30][31][32] …”

Section: Introductionmentioning

confidence: 99%

Determination of solid phase chemical diffusion coefficient and density of states by electrochemical methods: Application to iridium oxide-based thin films

Backholm

Georén

Niklasson

2008

Journal of Applied Physics

Self Cite

View full text Add to dashboard Cite

Potentiostatic intermittent titration technique ͑PITT͒ and electrochemical impedance spectroscopy ͑EIS͒ were investigated as methods to determine solid phase chemical diffusion coefficient ͑D͒ and electronic density of states ͑DOS͒. These techniques were then applied to iridium oxide ͑IrOx͒ and iridium-tantalum oxide ͑IrTaOx͒ thin films prepared by sputter deposition. The experiments, performed in 1M propionic acid between −0.2 and 0.8 V vs Ag/ AgCl, showed effects of interfacial side reactions, whose contribution to the electrochemical response could be identified and corrected for in the case of PITT as well as EIS. It was found that D is strongly underestimated when using PITT with the common Cottrell formalism, which follows from non-negligible interfacial charge transfer and Ohmic resistances. EIS indicated an anomalous diffusion mechanism, and D was determined to be in the 10 −11 -10 −10 cm 2 / s range for IrOx and IrTaOx. Both PITT and EIS showed that the intercalated charge as a function of potential exhibits a shape that resembles the theoretical DOS of crystalline iridium oxide, especially for IrTaOx.

show abstract

“…Also films based on IrO 2 and Ir 2 O 3 have enjoyed an increased interest lately (Nishio et al 1999, Backholm et al 2006Backholm & Nikklason 2008;Jiang et al 2008). While IrO 2 -based films are excessively expensive, good electrochromic properties are obtained after dilution with the much cheaper Ta 2 O 5 .…”

Section: Iridium Oxidementioning

confidence: 99%

Properties, requirements and possibilities of smart windows for dynamic daylight and solar energy control in buildings: A state-of-the-art review

Bætens

Jelle

Gustavsen

2010

Solar Energy Materials and Solar Cells

1,139

591

View full text Add to dashboard Cite

A survey on prototype and currently commercial dynamic tintable smart windows has been carried out. The technologies of electrochromic, gasochromic, liquid crystal and electrophoretic or suspended-particle devices were examined and compared for dynamic daylight and solar energy control in buildings. Presently, state-of-the art commercial electrochromic windows seem most promising to reduce cooling loads, heating loads and lighting energy in buildings, where they have been found most reliable and able to modulate the transmittance up to 68 percent of the total solar spectrum. Their efficiency has already been proven in hot Californian climates, but more research is necessary to validate the products for colder climates, and to improve furthermore the commercial products in order to control the indoor climate in a more energy efficient way by reducing both heating and cooling loads.

show abstract

Electrochemical and optical properties of sputter deposited Ir–Ta and Ir oxide thin films

Cited by 34 publications

References 11 publications

Electrochromic nickel oxide films and their compatibility with potassium hydroxide and lithium perchlorate in propylene carbonate: Optical, electrochemical and stress-related properties

Electrochromic nickel oxide films and their compatibility with potassium hydroxide and lithium perchlorate in propylene carbonate: Optical, electrochemical and stress-related properties

Determination of solid phase chemical diffusion coefficient and density of states by electrochemical methods: Application to iridium oxide-based thin films

Properties, requirements and possibilities of smart windows for dynamic daylight and solar energy control in buildings: A state-of-the-art review

Contact Info

Product

Resources

About