Abstract:Photocurrent of Ag2S particles decreases in alcohol gases or with CuPc coating and increases in CS2. This interesting phenomenon is explained through a model of gas adsorption.
“…Actually, researches on Ag 2 S-based optical sensing devices have been conducted. 24,25) We thought that local light irradiation to a Ag 2 S island network reservoir promotes the growth and contraction of Ag filaments between Ag 2 S islands in a light-irradiated area, which modifies a network of conductive channels. In this study, we confirmed the function and applied it to develop a physical reservoir with optical sensing capability for optical pattern classification.…”
A physical reservoir that accepts direct light irradiation as input was developed using a Ag2S island network. Short-term memory and nonlinearity required for reservoirs are achieved by diffusion of Ag+ cations in each Ag2S island and growth of Ag filaments between Ag2S islands. We found that direct light irradiation to Ag2S islands changes local conductivity in a reservoir, which enhances the performance in short-term memory and nonlinearity of the reservoir. Using the effect, we performed a pattern classification of light that was irradiated to a Ag2S island network reservoir through a rectangular slit, which resulted in the accuracy over 95%.
“…Actually, researches on Ag 2 S-based optical sensing devices have been conducted. 24,25) We thought that local light irradiation to a Ag 2 S island network reservoir promotes the growth and contraction of Ag filaments between Ag 2 S islands in a light-irradiated area, which modifies a network of conductive channels. In this study, we confirmed the function and applied it to develop a physical reservoir with optical sensing capability for optical pattern classification.…”
A physical reservoir that accepts direct light irradiation as input was developed using a Ag2S island network. Short-term memory and nonlinearity required for reservoirs are achieved by diffusion of Ag+ cations in each Ag2S island and growth of Ag filaments between Ag2S islands. We found that direct light irradiation to Ag2S islands changes local conductivity in a reservoir, which enhances the performance in short-term memory and nonlinearity of the reservoir. Using the effect, we performed a pattern classification of light that was irradiated to a Ag2S island network reservoir through a rectangular slit, which resulted in the accuracy over 95%.
“…The Schottky rectifying effect is caused by the pn junction space charge field formed at the Ag 2 S/Cu 3 P interface. The conduction type of n-Ag 2 S and p-Cu 3 P was proved by hot-probe method [ 20 , 21 ]. Fig.…”
Section: Resultsmentioning
confidence: 99%
“…5 a shows the I–V curves of the Ag 2 S/Cu 3 P structure with Ag 2 S layer being heated. The cross point of the figure- 8 shape deviates towards positive voltage, which is due to the Seebeck effect [ 25 ]. The resistances both of HRS and LRS decrease with the rise of temperature ( Fig.…”
“…In fact, several studies have been conducted on Ag 2 S-based optical sensing devices. 33,34) We have previously demonstrated that direct light irradiation to a physical reservoir made of a Ag 2 S island network changes the properties of nonlinear transformations and memory capacity, thereby enabling the classification of optical patterns. 35) We believe that local photoexcitation changes the electronic conduction properties within the network, which also changes the distribution of silver ions within each Ag 2 S island.…”
We have reported that a physical reservoir with a silver sulfide island network can classify simple patterns of an irradiated light without converting it to a voltage signal input. In this study, we conducted experiments to verify whether detection of dynamical change in an irradiating light, e.g., moving in a reservoir layer, can be available. We also investigated the potential of the reservoir to detect a position of light exposure and the wavelength dependence, in addition to the existence of exposure time of light to a reservoir. The technique was applied to a task whether characters could be recognized even if the irradiated position was changed.
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