Sung‐Il Kim1, Yeongjun Lee1, Min‐Ho Park1, Gyeong‐Tak Go1, Young‐Hoon Kim1, Wentao Xu1, Hyeon‐Dong Lee1, Hobeom Kim1, Dae‐Gyo Seo1, Wanhee Lee1, Tae‐Woo Lee2
1Department of Materials Science and Engineering, Seoul National University (SNU), 1 Gwanak-ro, Gwanak-gu, Seoul, 08826 Republic of Korea
2Department of Materials Science and Engineering, Nano Systems Institute (NSI), Institute of Engineering Research, Research Institute of Advanced Materials, BK21 PLUS SNU Materials Division for Educating Creative Global Leaders, Seoul National University (SNU), 1 Gwanak-ro, Gwanak-gu, Seoul, 08826 Republic of Korea
Tóm tắt
AbstractThe hysteretic behavior of organic–inorganic halide perovskites (OHPs) are exploited for application in neuromorphic electronics. Artificial synapses with 2D and quasi‐2D perovskite are demonstrated that have a bulky organic cation (phenethylammonium (PEA)) to form structures of (PEA)2MAn‐1PbnBr3n+1. The OHP films have morphological properties that depend on their structure dimensionality (i.e., n value), and artificial synapses fabricated from them show synaptic responses such as short‐term plasticity, paired‐pulse facilitation, and long‐term plasticity. The operation mechanism of OHP artificial synapses are also analyzed depending on the dimensionality and it is found that quasi‐2D (n = 3–5) OHP artificial synapses show much longer retention than 2D and 3D OHP counterparts. The calculated energy consumption of a 2D OHP artificial synapse (≈0.7 fJ per synaptic event) is comparable to that of biological synapses (1–10 fJ per synaptic event). These OHP artificial synapses may enable development of neuromorphic electronics that use very little energy.
