Tailoring Optical Properties in Transparent Highly Conducting Perovskites by Cationic Substitution

Mohammadi, Mahdad; Xie, Ruiwen; Hadaeghi, Niloofar; Radetinac, Aldin; Arzumanov, A.V.; Komissinskiy, Philipp; Zhang, Hongbin; Alff, Lambert

doi:10.1002/adma.202206605

Cited by 9 publications

(6 citation statements)

References 60 publications

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“…Indeed, for a r H of 50%, this energy is equal to 2.97 eV, while we obtained a value of around 2.72 eV for a r H of 80%. In literature, a value of 2.70 eV is found for the indirect transition of SrVO 3 and is associated with an excitation of an electron from the oxygen 2p band to the empty V 3d-t 2g band. , We can therefore conclude once again that the higher the hydrogen rate is during the growth process, the more the resulting layer has physical properties which tend toward those of SrVO 3 .…”

Section: Resultsmentioning

confidence: 77%

Structural, Electrical, and Optical Properties of Strontium–Vanadate Films Grown by Magnetron Sputtering

Rouviller,

Mezhoud,

Misiak

et al. 2024

ACS Appl. Electron. Mater.

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SrVO 3 is a strongly correlated metal which has been highly studied in recent years due to its optical and electrical properties, which makes it a promising transparent conducting oxide (TCO). By investigating and optimizing these interesting properties, SrVO 3 might be able to replace in the future indium−tin oxide, which is the most commonly used TCO at the current time but suffers from resource depletion. In this study, films of about 30 nm were grown by reactive sputtering of Sr 2 V 2 O 7 target onto Si substrates, both with and without a TiO 2 buffer layer, at different temperatures, and using different ratios between H 2 and Ar during the growth. The structural, electrical, and optical properties of these films were analyzed, illustrating the importance of the TiO 2 buffer layer as well as the growth parameters in obtaining conductive and transparent thin films. Moreover, the measurements of electrical and optical properties revealed that actually, these films do not have a correlated metal behavior but are more a semiconductor one, most probably due to a no-stoichiometry in comparison to SrVO 3 . However, the high electrical conductivity of the obtained films is higher than one of the undoped transparent semiconductors such as ZnO or SnO 2 currently used in the field of microelectronics. These results pave the way of using such a material in devices requiring TCO properties in a complementary metaloxide-semiconductor compatible approach.

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Section: Resultsmentioning

confidence: 77%

Structural, Electrical, and Optical Properties of Strontium–Vanadate Films Grown by Magnetron Sputtering

Rouviller,

Mezhoud,

Misiak

et al. 2024

ACS Appl. Electron. Mater.

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“…The thin-film transmittance spectra are normalized to the spectra of bare substrates to eliminate the influence of substrates. The transmittance of the SMO films is then calculated using the formula T = I normalt , normalm I normalt , normals , where I t,m is the transmitted intensity through the sample and I t,s is the transmitted intensity through the bare substrate. ,,, The transmittance decreases with increasing film thickness on all three substrates. The 20 nm-thick SMO films on STO substrates exhibit a high transmittance of 75–90% for wavelengths ranging from 400 to 700 nm.…”

Section: Resultsmentioning

confidence: 99%

High UV Transparent Conductivity of SrMoO₃ Thin Films

Jia,

Chen,

Nan

et al. 2024

Crystal Growth & Design

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The perovskite oxide SrMoO 3 has attracted significant attention for its potential applications in ultraviolet (UV) transparent conductors. Thus far, synthesizing high-quality epitaxial SrMoO 3 thin films by pulsed laser deposition (PLD) is usually under highly reducing (Ar or Ar-H 2 gas mixture) atmospheres. Here, we grew SrMoO 3 epitaxial films using the PLD technique at a base pressure below 1 × 10 −5 Pa without any gas supply to optimize their optical and electrical properties. By depositing these films on the (001) SrTiO 3 , (001) LaAlO 3 , and (001) MgO substrates, the as-grown SrMoO 3 films, with a nominal lattice mismatch in the range of −4.8 to +5.7% and a thickness of 20−60 nm, show prominent transparent conductivity in both visible and UV wavelengths. All the films exhibit metallic-like conductivity, with a room-temperature resistivity varying from 10 to 60 μΩ•cm. The resistivity increases with decreasing thickness. Notably, we can achieve extremely high transmittance, exceeding 80% for wavelengths ranging from 300 to 500 nm, and a low resistivity of approximately 20 μΩ•cm in SrMoO 3 films as thin as 20 nm. The excellent UV transparent conducting properties that are insensitive to the substrate type and film thickness make SrMoO 3 films a promising material for various photoelectronic devices and energy-harvesting applications.

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“…[3] Besides their high electric conductivity, SrMoO 3 and the related SrBO 3 perovskite compounds with (intermixed) Mo, V, and Nb at the B-site show intrinsically high optical transparency across and beyond the visible spectral region, making them in addition promising transparent conducting materials. [4][5][6] The reported resistivity values of epitaxial SrMoO 3 thin films grown by pulsed laser deposition (PLD) and molecular beam epitaxy are well below 50 μΩ cm at room temperature [7][8][9][10] with the lowest value even below 20 μΩ cm. [11] Recently, the layer-bylayer growth of 5 μm-thick fully strained epitaxial SrMoO 3 films on GdScO 3 substrates was reported using PLD, which is well above reported values of critical thicknesses of perovskite epitaxial thin films of similar lattice mismatch.…”

Section: Introductionmentioning

confidence: 99%

“…[ 3 ] Besides their high electric conductivity, SrMoO 3 and the related Sr B O 3 perovskite compounds with (intermixed) Mo, V, and Nb at the B ‐site show intrinsically high optical transparency across and beyond the visible spectral region, making them in addition promising transparent conducting materials. [ 4–6 ]…”

Section: Introductionmentioning

confidence: 99%

Giant Critical Thickness in Highly Conducting Epitaxial SrMoO₃Electrodes Investigated by Lift‐Off Membranes

Ruan,

Schreyer,

Jiang

et al. 2024

Adv Funct Materials

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Within the huge perovskite materials family, thin films of highly conducting materials such as SrMoO3, SrNbO3, and SrVO3 are candidates for low‐loss bottom electrodes in epitaxial all‐oxide devices, in particular for high‐frequency applications. Recently, the fully coherent growth of more than 5 µm thick SrMoO3 electrodes in a varactor device prototype epitaxial heterostructure has been reported. This result raises the question of the strain mechanism in such anomalously thick coherent epitaxial layers. Here, this question is addressed by comparing the lattice constants of coherently strained layers and their free‐standing membranes. SrMoO3 is mainly elastically strained within the heterostructure and fully relaxed after removal of the substrate. These results indicate a giant critical thickness, making highly conducting perovskites even more outstanding materials for high‐frequency applications that require electrode thicknesses beyond the skin depth. The described technology of lifting off thick SrMoO3 membranes joins the emerging field of freestanding oxide layer technology, opening unexplored avenues for single crystal investigations, novel perovskite nanostructures, and wafer transfer of functional oxides, walking in the footsteps of recent developments in van der Waals epitaxial heterostructures.

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Tailoring Optical Properties in Transparent Highly Conducting Perovskites by Cationic Substitution

Abstract: Figure 7. Crystal structures corresponding to Sr(V 1−x Mo x )O 3 with x = 0.25 (left), 0.5 (middle), 0.75 (right).

Cited by 9 publications

References 60 publications

Structural, Electrical, and Optical Properties of Strontium–Vanadate Films Grown by Magnetron Sputtering

Structural, Electrical, and Optical Properties of Strontium–Vanadate Films Grown by Magnetron Sputtering

High UV Transparent Conductivity of SrMoO₃ Thin Films

Giant Critical Thickness in Highly Conducting Epitaxial SrMoO₃Electrodes Investigated by Lift‐Off Membranes

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Tailoring Optical Properties in Transparent Highly Conducting Perovskites by Cationic Substitution

Abstract: Figure 7. Crystal structures corresponding to Sr(V 1−x Mo x )O 3 with x = 0.25 (left), 0.5 (middle), 0.75 (right).

Cited by 9 publications

References 60 publications

Structural, Electrical, and Optical Properties of Strontium–Vanadate Films Grown by Magnetron Sputtering

Structural, Electrical, and Optical Properties of Strontium–Vanadate Films Grown by Magnetron Sputtering

High UV Transparent Conductivity of SrMoO3 Thin Films

Giant Critical Thickness in Highly Conducting Epitaxial SrMoO3Electrodes Investigated by Lift‐Off Membranes

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Product

Resources

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High UV Transparent Conductivity of SrMoO₃ Thin Films

Giant Critical Thickness in Highly Conducting Epitaxial SrMoO₃Electrodes Investigated by Lift‐Off Membranes