Journal
NANO LETTERS
Volume 20, Issue 5, Pages 3761-3768Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.0c00733
Keywords
GaN; micro/nanowire; piezotronic; synapse; neuromorphic; strain sensing
Categories
Funding
- National Key Research and Development Program of China [2016YFA0202703]
- National Natural Science Foundation of China [61904012, 51432005, 61574018, 61704008, 51622205, 61675027, 61505010, 51502018]
- Beijing City Committee of Science and Technology [Z171100002017019, Z181100004418004]
- Natural Science Foundation of Beijing Municipality [4204114, 4181004, 4182080, 4184110, 2184131, Z180011]
- Hundred Talents Program of the Chinese Academy of Science
- University of Chinese Academy of Sciences
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Tactile information is efficiently captured and processed through a complex sensory system combined with mechanoreceptors, neurons, and synapses in human skin. Synapses are essential for tactile signal transmission between pre/postneurons. However, developing an electronic device that integrates the functions of tactile information sensation and transmission remains a challenge. Here, we present a piezotronic synapse based on a single GaN microwire that can simultaneously achieve the capabilities of strain sensing and synaptic functions. The piezotronic effect in the wurtzite GaN is introduced to strengthen synaptic weight updates (e.g., 330% enhancement at a compressive stress of -0.36%) with pulse trains. A high gauge factor for strain sensing (ranging from 0 to -0.81%) of about 736 is also obtained. Remarkably, the piezotronic synapse enables the neuromorphic hardware achievement of the perception and processing of tactile information in a single micro/nanowire system, demonstrating an advance in biorealistic artificial intelligence systems.
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