Iteratively derived optical constants of MoO3 polycrystalline thin films prepared by CVD

Abdellaoui, A.; Lévêque, G.; Donnadieu, A.; Bath, A.; Bouchikhi, Benachir

doi:10.1016/s0040-6090(97)00092-8

Cited by 74 publications

(30 citation statements)

References 21 publications

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“…E g values were determined, assuming indirect and allowed electron transitions (g = 2) in MoO 3 and WO 3 films. [24] For the mixed MoO 3 /WO 3 films this assumption leads to difficulties in defining E g , since there is no sufficient linear part in the dependence for extrapolation. Accepting direct and allowed electron transitions (g = 1/2) as prevailing, the experimental data show a rather long linear part of ahm ∼ (hm-E g )…”

Section: Optical Propertiesmentioning

confidence: 99%

A Low-Temperature Atmospheric Pressure CVD Process for Growing Thin Films of MoO3 and MoO3-WO3 for Electrochromic Device Applications

Gesheva

Ivanova

2006

Chem. Vap. Deposition

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Thin films of MoO 3 and mixed Mo/W oxides have been obtained by atmospheric pressure (AP)CVD, using pyrolytic decomposition of metal carbonyls. The correlation between film structure and optical properties is studied by applying techniques such as Raman spectroscopy (RS), Fourier transform infrared (FTIR) spectroscopy, and UV-vis spectrophotometry. The transmittance in the visible range of films deposited on glass substrates is about 80 %, but when deposited on conductive glass (e.g., SnO 2 :Sb/glass) the films have 60 % transmittance. After annealing, the optical transmittance of the single oxide films improves, while for the mixed oxide films it slightly decreases. The electrochromic (EC) properties of MoO 3 and mixed Mo/W oxide films have been investigated by cyclic voltammetry. Deep-blue coloring of all the EC films appears only in the cathodic range, minimizing the visible-light transmittance. In the anodic regime, the EC film starts bleaching and becomes transparent. Devices fabricated with a solid polymeric-type electrolyte and a functioning layer of mixed oxide films exhibit good reversibility of the effect, and an optical modulation of about 30 % is obtained.

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Section: Optical Propertiesmentioning

confidence: 99%

A Low-Temperature Atmospheric Pressure CVD Process for Growing Thin Films of MoO3 and MoO3-WO3 for Electrochromic Device Applications

Gesheva

Ivanova

2006

Chem. Vap. Deposition

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“…The refractive indices of ITO, ZnO, PEDOT:PSS and PTB7:PC 71 BM were determined by spectroscopic ellipsometry. The complex refractive indices of MoO 3 and Ag were taken from literature [24,25].…”

Section: Resultsmentioning

confidence: 99%

Understanding the angle-independent photon harvesting in organic homo-tandem solar cells

et al. 2016

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Abstract:The effective device photo current of organic tandem solar cells is independent of the angle of light incidence up to 65°. This feature renders these devices particularly suitable for stationary applications where they receive mainly indirect light. In a combined experimental and simulative study, we develop a fundamental understanding of the causal absorption and charge generation mechanisms in organic homo-tandem solar cells. A 3-terminal tandem device architecture is used to measure the optoelectronic properties of both subcells individually. The analysis of the angle dependent external quantum efficiencies of the subcells and the tandem device reveal an internal balancing of the wavelength dependent subcell currents elucidating the low sensitivity of the tandem device properties on the angle of incidence.

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“…[31] The refractive index at 580 nm is essentially unchanged at a value of ~2.2, and this value is among the highest values reported in the literature for as-deposited films. [32] This indicates that O 2 is being supplied in sufficient excess.…”

Section: Molybdenum Oxide Synthesismentioning

confidence: 99%

Nanoporous, Metal Carbide, Surface Diffusion Membranes for High Temperature Hydrogen Separations

Way¹,

Wolden²

2013

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Colorado School of Mines (CSM) developed high temperature, hydrogen permeable membranes that contain no platinum group metals with the goal of separating hydrogen from gas mixtures representative of gasification of carbon feedstocks such as coal or biomass in order to meet DOE NETL 2015 hydrogen membrane performance targets. We employed a dual synthesis strategy centered on transition metal carbides. In the first approach, novel, high temperature, surface diffusion membranes based on nanoporous Mo 2 C were fabricated on ceramic supports. These were produced in a two step process that consisted of molybdenum oxide deposition followed by thermal carburization. Our best Mo 2 C surface diffusion membrane achieved a pure hydrogen flux of 367 SCFH/ft 2 at a feed pressure of only 20 psig. The highest H 2 /N 2 selectivity obtained with this approach was 4.9. A transport model using "dusty gas" theory was derived to describe the hydrogen transport in the Mo 2 C coated, surface diffusion membranes. The second class of membranes developed were dense metal foils of BCC metals such as vanadium coated with thin (< 60 nm) Mo 2 C catalyst layers. We have fabricated a Mo 2 C/V composite membrane that in pure gas testing delivered a H 2 flux of 238 SCFH/ft 2 at 600 °C and 100 psig, with no detectable He permeance. This exceeds the 2010 DOE Target flux. This flux is 2.8 times that of pure Pd at the same membrane thickness and test conditions and over 79% of the 2015 flux target. In mixed gas testing we achieved a permeate purity of ≥99.99%, satisfying the permeate purity milestone, but the hydrogen permeance was low, ~0.2 SCFH/ft 2 .psi. However, during testing of a Mo 2 C coated Pd alloy membrane with DOE 1 feed gas mixture a hydrogen permeance of >2 SCFH/ft 2 .psi was obtained which was stable during the entire test, meeting the permeance associated with the 2010 DOE target flux. Lastly, the Mo 2 C/V composite membranes were shown to be stable for at least 168 hours = one week, including cycling at high temperature and alternating He/H 2 exposure.4

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Iteratively derived optical constants of MoO3 polycrystalline thin films prepared by CVD

Cited by 74 publications

References 21 publications

A Low-Temperature Atmospheric Pressure CVD Process for Growing Thin Films of MoO3 and MoO3-WO3 for Electrochromic Device Applications

A Low-Temperature Atmospheric Pressure CVD Process for Growing Thin Films of MoO3 and MoO3-WO3 for Electrochromic Device Applications

Understanding the angle-independent photon harvesting in organic homo-tandem solar cells

Nanoporous, Metal Carbide, Surface Diffusion Membranes for High Temperature Hydrogen Separations

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