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Journal articles on the topic 'Photodiffusion'

Author: Grafiati

Published: 4 June 2021

Last updated: 8 February 2022

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1

Sakaguchi, Yoshifumi, Takayasu Hanashima, Al-Amin Ahmed Simon, and Maria Mitkova. "Silver photodiffusion into amorphous Ge chalcogenides." European Physical Journal Applied Physics 90, no. 3 (June 2020): 30101. http://dx.doi.org/10.1051/epjap/2020190368.

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Silver photodiffusion into amorphous chalcogenides involves the movement of ions controlled by a UV-visible light illumination, and has potential application to memory devices. Understanding the kinetics of this phenomenon will expand the range of possible applications. Herein, we report the excitation photon energy dependence of the silver photodiffusion kinetics in Ag/amorphous Ge20S80/Si substrate stacks, probed by neutron reflectivity using four light-emitting diodes with different peak wavelengths. Time-dependent changes were clearly observed in all three of the Ag/Ag-doped reaction/chalcogenide host layers, in terms of layer thickness, scattering length density, and roughness. Silver photodiffusion effectively occurred when the excitation photon energy was greater than the optical gap of the chalcogenide host material. Excitation of lone-pair electrons to anti-bonding states at the chalcogenide layer therefore appears to play a crucial role in triggering silver photodiffusion.

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2

Kluge, Günther, Andreas Thomas, Roland Klabes, Rainer Grötzchel, and Peter Süptitz. "Silver photodiffusion in amorphous GexSe100−x." Journal of Non-Crystalline Solids 124, no. 2-3 (October 1990): 186–93. http://dx.doi.org/10.1016/0022-3093(90)90262-k.

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3

Lakshmikumar, S. T. "A new model for photodiffusion of silver in amorphous chalcogenides." Journal of Non-Crystalline Solids 88, no. 2-3 (December 1986): 196–205. http://dx.doi.org/10.1016/s0022-3093(86)80021-7.

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4

Sakaguchi, Yoshifumi, Hidehito Asaoka, and Maria Mitkova. "Kinetics of silver photodiffusion into amorphous S-rich germanium sulphide – neutron and optical reflectivity." Pure and Applied Chemistry 91, no. 11 (November 26, 2019): 1821–35. http://dx.doi.org/10.1515/pac-2019-0217.

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Abstract Silver photodiffusion is one of the attractive photo-induced changes observed in amorphous chalcogenides. In this research, we focus on amorphous S-rich germanium sulphide and study the kinetics of the silver photodiffusion by neutron reflectivity, as well as optical reflectivity. It was found from the neutron reflectivity profiles with 30 s time resolution that silver dissolved into the germanium sulphide layer, forming a metastable reaction layer between the Ag and the germanium sulphide layers, within 2 min of light exposure. Subsequently, silver slowly diffused from the metastable reaction layer to the germanium sulphide host layer until the Ag concentration in both layers became identical, effectively forming one uniform layer; this took approximately 20 min. Optical reflectivity reveals the electronic band structure of the sample, complementary to neutron reflectivity. It was found from the optical reflectivity measurement that the metastable reaction layer was a metallic product. The product could be Ag8GeS6-like form, which is regarded as the combination of GeS2 and Ag2S, and whose backbone is composed of the GeS4 tetrahedral units and the S atoms. We attribute the first quick diffusion to the capture of Ag ions by the latter S atoms, which is realised by the S–S bond in amorphous S-rich germanium sulphide, while we attribute the second slow diffusion to the formation of the Ag–Ge–S network, in which Ag ions are captured by the former GeS4 tetrahedral units.

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5

Sakaguchi, Y., H. Asaoka, and M. Mitkova. "Silver photodiffusion into Ge-rich amorphous germanium sulfide—neutron reflectivity study." Journal of Applied Physics 122, no. 23 (December 21, 2017): 235105. http://dx.doi.org/10.1063/1.5000858.

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6

Sava, Florinel, Mihai Popescu, Adam Lőrinczi, and Alin Velea. "Possible mechanism of Ag photodiffusion in a-As2 S3 thin films." physica status solidi (b) 250, no. 5 (March 4, 2013): 999–1003. http://dx.doi.org/10.1002/pssb.201248517.

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7

Kovalskiy, A., H. Jain, and M. Mitkova. "Evolution of chemical structure during silver photodiffusion into chalcogenide glass thin films." Journal of Non-Crystalline Solids 355, no. 37-42 (October 2009): 1924–29. http://dx.doi.org/10.1016/j.jnoncrysol.2008.12.021.

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8

Mitkova, M., M. N. Kozicki, H. C. Kim, and T. L. Alford. "Thermal and photodiffusion of Ag in S-rich Ge–S amorphous films." Thin Solid Films 449, no. 1-2 (February 2004): 248–53. http://dx.doi.org/10.1016/j.tsf.2003.10.077.

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9

Sakaguchi, Yoshifumi, Hidehito Asaoka, Yuki Uozumi, Yukinobu Kawakita, Takayoshi Ito, Masato Kubota, Dai Yamazaki, Kazuhiko Soyama, Gaurav Sheoran, and Maria Mitkova. "Processes of silver photodiffusion into Ge-chalcogenide probed by neutron reflectivity technique." physica status solidi (a) 213, no. 7 (March 22, 2016): 1894–903. http://dx.doi.org/10.1002/pssa.201533037.

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10

Dzhafarov, T. D., M. Serin, D. Ören, B. Süngü, and M. S. Sadigov. "The effect of Ag photodiffusion on characteristics of Ag-CdS diode structures." Journal of Physics D: Applied Physics 32, no. 5 (January 1, 1999): L5—L8. http://dx.doi.org/10.1088/0022-3727/32/5/001.

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11

Sakaguchi, Yoshifumi, Takayasu Hanashima, Hiroyuki Aoki, Hidehito Asaoka, Al-Amin Ahmed Simon, and Maria Mitkova. "Kinetics of Silver Photodiffusion Into Amorphous Ge20 S80 Films: Case of Pre-Reaction." physica status solidi (a) 215, no. 12 (March 24, 2018): 1800049. http://dx.doi.org/10.1002/pssa.201800049.

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12

Индутный, И. З., В. И. Минько, Н. В. Сопинский, and П. М. Литвин. "Плазмон-стимулированное фотолегирование в тонкослойной структуре As-=SUB=-2-=/SUB=-S-=SUB=-3-=/SUB=---Ag." Журнал технической физики 127, no. 11 (2019): 865. http://dx.doi.org/10.21883/os.2019.11.48529.201-19.

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Abstract The effect of the excitation of surface plasmon polaritons at the silver – chalcogenide glass interface on photostimulated diffusion of silver into the chalcogenide was studied for the first time. To excite plasmons, a high-frequency aluminum diffraction grating with a period of 248.5 nm was used, onto which a two-layer Ag–As2S3 structure was deposited. It was found that the process of photostimulated diffusion of silver into the chalcogenide layer is accelerated (that is, the photosensitivity of such a structure increases) when the surface plasmon polariton is excited at the Ag – As2S3 interface during the exposure. The dynamics of photostimulated changes in the optical characteristics of the structure, including the initial stage of the photodiffusion process, was registered by recording the changes in the plasmon excitation characteristics with the exposure time.

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13

Wang, Rongzhu, and J. Hugh Horton. "Photodiffusion of silver in germanium-sulfur compounds studied by AFM, nanoindentation and RBS methods." Physical Chemistry Chemical Physics 5, no. 19 (2003): 4335. http://dx.doi.org/10.1039/b307657a.

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14

Jain, Himanshu, Andriy Kovalskiy, and Alfred Miller. "An XPS study of the early stages of silver photodiffusion in Ag/a-As2S3 films." Journal of Non-Crystalline Solids 352, no. 6-7 (May 2006): 562–66. http://dx.doi.org/10.1016/j.jnoncrysol.2005.11.044.

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15

Sakaguchi, Y., H. Asaoka, Y. Uozumi, Y. Kawakita, T. Ito, M. Kubota, D. Yamazaki, et al. "Studies of silver photodiffusion dynamics in Ag/GexS1−x(x= 0.2 and 0.4) films using neutron reflectometry." Canadian Journal of Physics 92, no. 7/8 (July 2014): 654–58. http://dx.doi.org/10.1139/cjp-2013-0593.

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To better understand the dynamics of silver photodiffusion into amorphous chalcogenide (Ch) films, it is informative to probe the time-dependent distribution of silver in the films while they are simultaneously exposed to visible light. Time-resolved neutron reflectometry is particularly well-suited to this purpose because it can follow time-dependent changes in the multilayer structure (Ag/Ag–Ch/Ch) while excluding the possibility of probe beam induced changes. This paper reports the results of time-resolved neutron reflectivity measurements of two Ag/GexS1−x(x = 0.2 and 0.4) films as they are exposed to a visible light source. Analysis showed that silver diffusion occurs via two distinct processes: a fast diffusion that takes place during the first 2 and 10 min of sample illumination for the x = 0.2 and 0.4 films, respectively; and a subsequent slower change that is observed over the next 18 min (x = 0.2 film) and 107 min (x = 0.4 film). These results suggest the formation of a relatively stable Ag-rich phase in the reaction layer followed by slower diffusion at the interface between Ag-rich and Ag-poor layers. Fourier transform analysis shows that the position of the interface is essentially fixed — a conclusion that contradicts the “diffusion front” model that has been previously postulated.

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16

Sakaguchi, Yoshifumi, Takayasu Hanashima, Hiroyuki Aoki, Hidehito Asaoka, Al-Amin Ahmed Simon, and Maria Mitkova. "Kinetics of Silver Photodiffusion Into Amorphous Ge20 S80 Films: Case of Pre-Reaction (Phys. Status Solidi A 12∕2018)." physica status solidi (a) 215, no. 12 (June 2018): 1870027. http://dx.doi.org/10.1002/pssa.201870027.

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17

Nordman, Olli, Nina Nordman, and Valfrid Pashkevich. "Refractive-index change caused by electrons in amorphous AsS and AsSe thin films doped with different metals by photodiffusion." Journal of the Optical Society of America B 18, no. 8 (August 1, 2001): 1206. http://dx.doi.org/10.1364/josab.18.001206.

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18

Sakaguchi, Yoshifumi, Takayasu Hanashima, Al-Amin Ahmed Simon, and Maria Mitkova. "Excitation Light Energy Dependence of Silver Photodiffusion into Amorphous Germanium Sulfide: Neutron and X‐Ray Reflectivity and X‐Ray Diffraction." physica status solidi (b) 257, no. 11 (June 8, 2020): 2000178. http://dx.doi.org/10.1002/pssb.202000178.

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19

Indutnyi, Ivan, Viktor Mynko, Mykola Sopinskyy, and Petro Lytvyn. "Impact of Surface Plasmon Polaritons on Silver Photodiffusion into As2S3 Film." Plasmonics, September 4, 2020. http://dx.doi.org/10.1007/s11468-020-01275-8.

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20

Dzhafarov, T. D., and M. Caliskan. "Photostimulated Changes of Electrical Characteristics of Ag/CdTe Thin Film Structures." MRS Proceedings 865 (2005). http://dx.doi.org/10.1557/proc-865-f5.13.

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AbstractElectrical, optical and structural properties of Ag/CdTe structures exposed to thermal (in dark) and photoannealing (under illumination) have been studied. The effective diffusion coefficie nt of Ag in CdTe films have been estimated from resistance versus duration of annealing curves. In the range of 280-420°C the effective coefficient of thermal diffusion (Dt) and photodiffusion (Dph) are described as Dt= 1.9x105exp (-1.60/kT) and Dph =8.7x103exp(-1.36/kT). The acceleration of Ag diffusion under illumination was tentatively attributed to photoionization of Ag increasing the interstitial flux of silver. Ag/CdTe structures exposed to annealing were characterized by X-ray diffraction (XRD), I-V, C-V, conductivity-temperature and optical transmission measurements. In XRD patterns of annealed Ag/CdTe structures, besides the intensive (111) peak of cubic CdTe, the weak peaks of Ag2Te phase are also present. The temperature dependence of conductivity of annealed Ag/CdTe structures showed the energy levels 0.13 eV.

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