Photoinduced reversible changes in local bonding configuration of amorphous Ge-S thin films

Davydova, N. A.; Tishchenko, V. V.; Baran, J.; Vlček, M.

doi:10.1016/s0022-2860(98)00419-0

Cited by 11 publications

(4 citation statements)

References 6 publications

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“…Beyond 1000 s of HeNe laser exposure, new Raman peaks at 222, 238, 285, 402, 602, and 650 cm −1 attributed to α-Fe 2 O 3 − were observed. Simultaneous growth of peaks at 222 and 238 cm −1 probably indicates the presence of polysulfides, namely, rearrangement of S-chain molecules to S-ring molecules during oxidation . Figure d shows that Raman peaks at 339 and 373 cm −1 were still detectable, indicating that the FeS 2 -like structures are still present.…”

Section: Resultsmentioning

confidence: 94%

“…Simultaneous growth of peaks at 222 and 238 cm -1 probably indicates the presence of polysulfides, namely, rearrangement of S-chain molecules to S-ring molecules during oxidation. 25 Figure 1d shows that Raman peaks at 339 and 373 cm -1 were still detectable, indicating that the FeS 2 -like structures are still present. These findings suggest that a longer HeNe-laser irradiation stimulates the formation of chemical bonds between oxygen and iron on the surface of crystalline FeS and causes S atoms to redistribute at the surface and the deeper regions (due to the diffusion of sulfur and/or to outflow of iron).…”

Section: Fe-s Powdersmentioning

confidence: 98%

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Photoinduced Structural Conversions of Transition Metal Chalcogenide Materials

et al. 2010

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The conversions of NiAs-type structures of transition metal chalcogenides (FeS and CoSe) to pyrite-type structures of dichalcogenides (FeS(2) and CoSe(2), respectively) under irradiation by HeNe laser (wavelength, 632.8 nm; intensity, 6 x 10(4) W/cm(2)) have been investigated using Raman spectroscopy. The laser-induced conversions give rise to Raman peaks corresponding to vibrations of S-S or Se-Se bonds of respective pyrite structures. The results are of interest for the characterization and fabrication of pyrite-like structures necessary for applications as oxygen reduction reaction catalysts. Material modifications at the micrometer and submicrometer levels are attainable. The structural conversions are accompanied by self-polymerization of excess chalcogen. Extended laser irradiation (>500 s) in air induces the substitution of chalcogen (S or Se) by oxygen in the chalcogenide materials and the subsequent formation of transition metal (Fe or Co) oxides. Excess chalcogen appears to prevent further oxidation. The article also presents conditions necessary to avoid laser-induced structural changes and oxidation of metal chalcogenide materials during Raman measurements.

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Section: Resultsmentioning

confidence: 94%

Section: Fe-s Powdersmentioning

confidence: 98%

Photoinduced Structural Conversions of Transition Metal Chalcogenide Materials

et al. 2010

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“…Photodiffusion from a thin surface film using ultraviolet light is a relatively simple way to add Ag to a binary base glass at low temperature to form a uniform ternary electrolyte in a highly controlled manner [25,26]. The process of photodissolution is driven by the formation of optically induced charged defects in the chalcogenide glass which create an electric field.…”

Section: Solid Electrolyte Formationmentioning

confidence: 99%

Mass transport in chalcogenide electrolyte films – materials and applications

Kozicki¹,

Mitkova²

2006

Journal of Non-Crystalline Solids

120

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“…In particular, they are distinguished from other materials by their photosensitivity. These materials exhibit intriguing photo-induced phenomena that are not observed in their crystalline counterparts or other amorphous medium, such as photodarkening and photobleaching [2,3]. Some of these unusual phenomena have many potential applications [4].…”

Section: Introductionmentioning

confidence: 99%