Influence of Na diffusion on thermochromism of vanadium oxide films and suppression through mixed-alkali effect

Miller, Mark J.; Wang, Junlan

doi:10.1016/j.mseb.2015.06.006

Cited by 16 publications

(6 citation statements)

References 32 publications

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“…32,33 Also, Li 2 O or Li + is a typical network modifying agent, contributing to structural densification. [34][35][36][37] The reaction between the dopant and the matrix phase is studied and results show that the mechanism is exactly the same in all cases. Compared with Cs + , Li + is an intermediate cation with a stronger electric field intensity in glass-ceramics system.…”

Section: (4) Sintering Mechanismmentioning

confidence: 99%

Effects of Li Substitution on the Microstructure and Thermal Expansion Behavior of Pollucite Derived from Geopolymer

Yuan

Yang

et al. 2016

J. Am. Ceram. Soc.

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The purpose of this work was to study the role of lithium in cesium‐based geopolymers and the thermal evolution during heat treatment together with thermal expansion behavior of the resulting geopolymer ceramic. A series of lithium‐substituted cesium‐based geopolymers, Cs(1−x)LixGP (where x = 0, 0.1, 0.2, and 0.3), were prepared. All the geopolymer samples were heated at 1300°C for 2 h and thermal evolution on heating was studied by a variety of techniques. Phase composition, microstructure evolution, and thermal expansion behaviors of the ceramics derived from the geopolymers were characterized. All the geopolymer specimens exhibited similar thermal evolutionary trends. With increases in lithium content, overall mass loss increased gradually due to the higher hydration energy of Li+ than Cs+. Thermal shrinkage of these specimens can be divided into four stages, i.e., structural resilience, dehydration, dehydroxylation, and sintering, according to the dilatometer results. The introduction of Li results in two‐step sintering behavior for the lithium‐substituted cesium‐based geopolymers. The average thermal expansion coefficient (CTE) of Cs(1−x)LixGP ceramics decreased from 4.80 × 10−6 K−1 (x = 0) to 3.61 × 10−6 K−1 (x = 0.3) with increase in lithium substitution. The reason can be attributed to the presence of spodumene after thermal treatment, which has a relatively low thermal expansion coefficient compared with pollucite. Meanwhile, molten spodumene could serve as a buffer phase between pollucite crystals also conducive to the decline of CTE of this system.

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Section: (4) Sintering Mechanismmentioning

confidence: 99%

Effects of Li Substitution on the Microstructure and Thermal Expansion Behavior of Pollucite Derived from Geopolymer

Yuan

Yang

et al. 2016

J. Am. Ceram. Soc.

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“…Glasses with multiple types of alkali ions (mixed‐alkali glasses) are known to exhibit a typical non‐linearity in their transport properties 55‐57 . Although not well defined, the non‐linearity is by the virtue of mobility of one alkali ion in the presence of another alkali ion with a different ionic radius 55,57 .…”

Section: Resultsmentioning

confidence: 99%

“…Glasses with multiple types of alkali ions (mixed-alkali glasses) are known to exhibit a typical non-linearity in their transport properties. [55][56][57] Although not well defined, the non-linearity is by the virtue of mobility of one alkali ion in the presence of another alkali ion with a different ionic radius. 55,57 It seems that the presence of two or more alkali ions in glasses has localized competitive effect, similar to electron-electron interactions in conductors.…”

Section: Glasses With Mixed-alkali Ionsmentioning

confidence: 99%

Evaluating the role of composition and local structure on alkali out‐diffusion in glasses for thin‐film solar cells

et al. 2020

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Fostered by the increasing demands for clean energy, thinfilm photovoltaic has drawn considerable research attention due to low material consumption and the rapid progress in the technology of cost-effective fabrication of thin films. 1-3 Inorganic compound semiconductors CuInGaSe 2 (CIGS) and Cu 2 ZnSnS 4 (CZTS) have been the most popular candidates as the absorber layer in thin-film solar cells due to their highly relevant optoelectronic properties. 1,4,5 Thin-film coatings on commercially available glass substrates for solar cells and optoelectronic devices have been widely studied. 6-8 Recently, apart from the optimization of the absorber films, many groups have undertaken studies highlighting the critical influence of the alkali ions diffusing from the substrates on the performance of the devices. 9-12 In the conventional architecture of the CIGS-and CZTS-based thin-film solar cells, besides providing mechanical support and high processing temperature, the substrate (most commonly used soda lime glass) doubles up as a source of Na that out-diffuses to the absorber layer via the bottom electrode (~1 μm thick Mo film). 13-16 Solar cells relying on the diffusion of Na

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“…Each of the deposition processes was carried out for 75 mins, which resulted in a nominal film thickness of 550 nm. The process was controlled carefully since the structure and properties of reactively-sputtered thin films are known to rely strongly on the processing conditions [23][24][25][26][27]. After deposition, samples were annealed in quiescent air at 450°C for 30 mins using a Barnstead Thermolyne 47900 furnace.…”

Section: Methodsmentioning

confidence: 99%

Coupled effects of deposition and annealing temperatures on optical, electrical and mechanical properties of titanium oxide thin films

Miller

Wang

2015

Vacuum

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Influence of Na diffusion on thermochromism of vanadium oxide films and suppression through mixed-alkali effect

Cited by 16 publications

References 32 publications

Effects of Li Substitution on the Microstructure and Thermal Expansion Behavior of Pollucite Derived from Geopolymer

Effects of Li Substitution on the Microstructure and Thermal Expansion Behavior of Pollucite Derived from Geopolymer

Evaluating the role of composition and local structure on alkali out‐diffusion in glasses for thin‐film solar cells

Coupled effects of deposition and annealing temperatures on optical, electrical and mechanical properties of titanium oxide thin films

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