Effect of a CdS interlayer in thermochromism and photochromism of MoO3 thin films

Quevedo‐Lopez, Manuel; Ramı́rez-Bon, R.; Orozco-Terán, R.A.; Mendoza-González, O.; Zelaya-Ángel, O.

doi:10.1016/s0040-6090(98)01680-0

Cited by 24 publications

(13 citation statements)

References 10 publications

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“…4. The 5 mol% ZnSe-doped films presented a better thermochromic response than the undoped films for temperatures below 125 o C. In agreement with results reported by QuevedoLopez et al [6], there was a decrease in the thermochromic response of the undoped MoO 3 films for temperatures above 200 o C. Since the thermal annealing was performed in the presence of air, the decoloration process can be associated with the replenishment of oxygen vacancies. For the 5 mol% ZnSe-doped samples the color saturation occurred at 125 o C, which might be due to the fact that S 2− occupies O 2− vacancies.…”

Section: Resultssupporting

confidence: 90%

“…All the theoretical models proposed to explain the chromogenic properties of MoO 3 are essentially based on the trapping of electrons at special defects in the lattice viz oxygen vacancies [4]. Some efforts have been made over the years to improve the intrinsic chromogenic properties of MoO 3 , including the use of a cadmium sulfide (CdS) interlayer in a MoO 3 /CdS system; this approach is based on the injection of electrons from the semiconductor to the oxide film [6], taking advantage of the lower bandgap energy of CdS (∼ 2.4 eV) compared to that of MoO 3 (≥ 3.0 eV). Our present study is based on a straightforward generalization of this idea, namely, the photo-and thermochromic properties of MoO 3 are enhanced by introducing small semiconductor particles (ZnSe) in the bulk of the oxide [7].…”

Section: Introductionmentioning

confidence: 99%

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Photochromism and thermochromism of MoO3 thin films doped with ZnSe

Arvizu¹,

Morales-Luna²,

Tomás³

et al. 2012

AIP Conference Proceedings

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The photochromic and thermochromic properties of molybdenum oxide (MoO 3 ) thin films doped with zinc selenide (ZnSe) were studied. The films were deposited on glass substrates by thermal evaporation of MoO 3 -ZnSe powder mixtures. EDS measurements confirmed the incorporation of ZnSe in the MoO 3 matrix while MicroRaman spectra of the samples showed structural changes by increasing ZnSe. MoO 3 films doped with 5 mol% ZnSe presented an enhancement in the photochromic effect compared to the undoped MoO 3 samples. The thermochromic effect was most pronounced for 5 mol% ZnSe samples annealed at 23-125 o C, and for undoped samples annealed at 125-225 o C. The MoO 3 films doped with 10 mol% showed neither photochromic nor thermochromic effect.

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Section: Resultssupporting

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Photochromism and thermochromism of MoO3 thin films doped with ZnSe

Arvizu¹,

Morales-Luna²,

Tomás³

et al. 2012

AIP Conference Proceedings

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“…All of these configurations have been synthesized with the objective of improving a given chromogenic property, typically having in mind specific applications. ,− The increased photochromic and thermochromic responses in these heterostructures have been explained in terms of the formation of a Schottky barrier created between the metal and the oxide that inhibits the fast recombination of the excited electrons. Another method to improve the chromogenic properties of MoO 3 thin films consisted in the deposition of an intermediate layer of a II–VI semiconductor, specifically cadmium sulfide (CdS) . This proposal is based on the injection of electrons from the CdS layer into the MoO 3 layer.…”

Section: Introductionmentioning

confidence: 99%

Effect of a CdSe Layer on the Thermo- and Photochromic Properties of MoO₃ Thin Films Deposited by Physical Vapor Deposition

et al. 2019

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The influence of a cadmium selenide (CdSe) layer on the thermochromic and photochromic properties of molybdenum trioxide (MoO 3 ) thin films was studied. The films were deposited on glass substrates by thermal evaporation in vacuum using two different bilayer configurations, namely, substrate/MoO 3 /CdSe (SMC) and substrate/CdSe/MoO 3 (SCM). The film thicknesses for the MoO 3 and CdSe layers were ca. 250 and 20 nm, respectively. The thermochromic effect was evaluated in the annealing temperature range from 25 to 225 °C, in the presence of air. The characteristic optical absorption band attributed to the color center formation, centered at 820 nm, indicated enhanced thermo-and photochromic effects for both bilayer systems relative to monolayer MoO 3 thin films. For the thermochromic effect, this improvement was more pronounced when CdSe was the upper layer, i.e., for the SMC system. Regarding the photochromic effect, the films were irradiated with UV light for several exposure times within the lapse of 30−180 min. While both bilayer systems presented better photochromic response than pure MoO 3 thin films, the SCM system exhibited better photochromic response. These results are explained in terms of the optical, structural, and surface chemistry properties of the films.

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“…The deposition or synthesis techniques allow us to modify the characteristics of the oxide in order to enhance the desired properties according to the application [14]. In addition, different configurations of deposition have been developed, such as MoO 3 /CdSe or MoO 3 /CdS or Au/MoO 3 [15][16][17]. The purpose of studying these configurations is to enhanced the optical absorbance of molybdenum trioxide (MoO 3 ).…”

Section: Introductionmentioning

confidence: 99%

Extinction Coefficient Modulation of MoO3 Films Doped with Plasmonic Nanoparticles: From an Effective Medium Theory Description

Morales-Luna

2021

Nanomaterials

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This work focused on the application of the effective medium theory to describe the extinction coefficient (Qext) in molybdenum trioxide (MoO3) doped with different kinds of plasmonic nanoparticles, such as silver (Ag), gold (Au), and copper (Cu). Usually, in studies of these materials, it is normal to analyze the transmission or absorption spectra. However, the effect of this type or size of nanoparticles on the spectra is not as remarkable as the effect that is found by analyzing the Qext of MoO3. It was shown that the β-phase of MoO3 enhanced the intensity response of the Qext when compared to the α-phase of MoO3. With a nanoparticle size of 5 nm, the Ag-doped MoO3 was the configuration that presents the best response in Qext. On the other hand, Cu nanoparticles with a radius of 20 nm embedded in MoO3 was the configuration that presented intensities in Qext similar to the cases of Au and Ag nanoparticles. Therefore, implementing the effective medium theory can serve as a guide for experimental researchers for the application of these materials as an absorbing layer in photovoltaic cells.

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Effect of a CdS interlayer in thermochromism and photochromism of MoO3 thin films

Cited by 24 publications

References 10 publications

Photochromism and thermochromism of MoO3 thin films doped with ZnSe

Photochromism and thermochromism of MoO3 thin films doped with ZnSe

Effect of a CdSe Layer on the Thermo- and Photochromic Properties of MoO₃ Thin Films Deposited by Physical Vapor Deposition

Extinction Coefficient Modulation of MoO3 Films Doped with Plasmonic Nanoparticles: From an Effective Medium Theory Description

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Effect of a CdS interlayer in thermochromism and photochromism of MoO3 thin films

Cited by 24 publications

References 10 publications

Photochromism and thermochromism of MoO3 thin films doped with ZnSe

Photochromism and thermochromism of MoO3 thin films doped with ZnSe

Effect of a CdSe Layer on the Thermo- and Photochromic Properties of MoO3 Thin Films Deposited by Physical Vapor Deposition

Extinction Coefficient Modulation of MoO3 Films Doped with Plasmonic Nanoparticles: From an Effective Medium Theory Description

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Effect of a CdSe Layer on the Thermo- and Photochromic Properties of MoO₃ Thin Films Deposited by Physical Vapor Deposition