Journal
SMALL METHODS
Volume -, Issue -, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smtd.202300251
Keywords
artificial photo synapses; c-axis-aligned crystals; indium gallium tin oxide; optical neuromorphic system; photodetectors; phototransistors
Ask authors/readers for more resources
This article presents a multifunctional optoelectronic device that combines photodetection, photosynaptic behavior, and photomemory. The device demonstrates high responsivity to blue light and shows excellent nonlinearity in synaptic weight potentiation and depression. It also achieves high accuracy in pattern recognition.
A multifunctional optoelectronic device implementing photodetector, photosynapse, and photomemory is of increasing attention for neuromorphic system. This enables multiple devices to be replaced with a single device, which simplifies the structure of complex, highly integrated electronics. Here, a multifunctional c-axis-aligned crystalline indium gallium tin oxide thin-film transistor (TFT) optoelectronic device is demonstrated. The photodetecting and photosynaptic behaviors could be demonstrated by tuning of gate pulse. The device shows a high responsivity of 1.1 x 10(6) A W-1 to blue light (467 nm) and cutoff frequency (f(-3dB)) of 2400 Hz exhibiting high frequency switching using a gate reset pulse. It is possible to implement photosynaptic behavior using persistent photoconductivity effect by applying a gate bias to make the TFT depletion mode. When potentiation and depression of synaptic weight are implemented with light pulse and gate voltage pulse, respectively, 64-state potentiation-depression curves are demonstrated with excellent nonlinearity of 1.13 and 2.03, respectively. When an artificial neural network is constructed with this device for the Modified National Institute of Standards and Technology training pattern recognition simulation, it shows a high pattern recognition accuracy of 90.4%.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available