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Thin-film biological stimulation devices are a device that can be easily implanted into living bodies and stimulate living muscles, neurons, etc. In this study, we researched dependences of stimulation amperages on load resistance and phosphate buffered saline concentration. It was found that the stimulation device has a sufficient ability to stimulate the living body.
Neural networks are information processing models based on the human brain, and they have been activity studied. However, in order to realize the hardware of the neural network, it is necessary to achieve high integration. In this study, we fabricated synapses for neural networks using the Ga-Sn-O (GTO) thin films, which is rare-metal-free amorphous oxide semiconductor. The synapses are planar type,...
We have developed a planar device using In-Ga-Zn-O (IGZO) semiconductor for synapse element in neural network. First, we formed the planar device on a glass substrate. Next, we formed it on an LSI wafer. Both devices shows proper uniformities of film thicknesses and sufficient degradations of electric characteristics, which can be utilized for modified Hebbian learning proposed by us. These results...
We have developed a cross-point device using In-Ga-Zn-O (IGZO) semiconductor for synapse element in neural network. Horizontal 80 and vertical 80 metal lines make 6400 cross-point synapse integrated on a glass substrate. The electrical conductance gradually degrades by flowing current, which is available for modified Hebbian learning.
The influence of dry-etching (D/E) damage during the source/drain (S/D) electrode etching process on the electrical properties of a bottom-gate In-Ga-Zn-O thin-film transistor (TFT) was investigated by varying the thickness of the etch-stop layer (ESL). For a thicker ESL of 200 nm, electrical properties of the TFTs with S/D electrodes formed by dry and wet-etching were comparable. However, an anomalous...
We are developing artificial retinas using poly-Si thin-film transistors (TFTs), which is suitable for the epiretinal implant on the curved human eyeballs. In this study, we have evaluated the wireless power supply to the artificial retinas using poly-Si TFTs. From simulation, it is found that the transmission efficiency can be 0.43 % currently. This value should be improved but acceptable because...
Low temperature TFT was fabricated on SiOx insulator film deposited with novel line shaped plasma source, namely, facing electrodes CVD (FE-CVD). The plasma was generated with magnetic field and RF power source applied to the two facing SiO2 targets. The insulating film was deposited with mixture of tetramethylsilane and oxygen as source gases at high deposition rate at 11.6 nm/min. Insulating properties...
We have evaluated an artificial retina using thin-film devices driven by wireless power supply. It is found that the illumination profile can be correctly detected as the output voltage profile even if it is driven using unstable wireless power supply. Particularly in this presentation, we confirm correct working of pattern recognition.
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