Bioresistive Random-Access Memory with Gold Nanoparticles
that Generate the Coulomb Blocking Effect Can Realize Multilevel Data
Storage and Synapse Simulation
posted on 2021-09-10, 16:04authored byLu Wang, Hongyu Zhu, Dianzhong Wen
Gold nanoparticles (Au NPs) have
good biocompatibility and special
quantum effects. In this Letter, we embedded Au NPs into silkworm
hemolymph (SH) to improve the performance of the device and fabricated
Al/SH:Au NPs/indium tin oxide (ITO)/glass resistive random access
memory. The device exhibits a bipolar switching behavior with a retention
time of 104 s. Compared with the Al/SH/ITO device without
Au NPs, the device has a higher ON/OFF current ratio (>105) and a smaller Vreset. The improvement
in device performance is attributed to the fact that Au NPs act as
the electron-trapping center in the device; a Coulomb blockade occurs
after electrons are trapped, thereby increasing the resistance of
the device in the high-resistance state. Using optimized devices can
realize multilevel data storage and can also simulate synaptic characteristics
such as potentiation and depression. The device is expected to be
applied to high-density, low-cost, degradable, and biocompatible storage
devices and neuromorphic computing in the future.