3D Stackable Synaptic Transistor for 3D Integrated Artificial Neural Networks

Seong Kwang Kim, Yeonjoo Jeong, Pavlo Bidenko, Hyeong Rak Lim, Yu Rim Jeon, Hansung Kim, Yun Jung Lee, Dae Myeong Geum, Jaehoon Han, Changhwan Choi, Hyung Jun Kim, Sanghyeon Kim

Research output: Contribution to journalArticlepeer-review

4 Scopus citations


Although they have attracted enormous attention in recent years, software-based and two-dimensional hardware-based artificial neural networks (ANNs) may consume a great deal of power. Because there will be numerous data transmissions through a long interconnection for learning, power consumption in the interconnect will be an inevitable problem for low-power computing. Therefore, we suggest and report 3D stackable synaptic transistors for 3D ANNs, which would be the strongest candidate in future computing systems by minimizing power consumption in the interconnection. To overcome the problems of enormous power consumption, it might be necessary to introduce a 3D stackable ANN platform. With this structure, short vertical interconnection can be realized between the top and bottom devices, and the integration density can be significantly increased for integrating numerous neuromorphic devices. In this paper, we suggest and show the feasibility of monolithic 3D integration of synaptic devices using the channel layer transfer method through a wafer bonding technique. Using a low-Temperature processible III-V and composite oxide (Al2O3/HfO2/Al2O3)-based weight storage layer, we successfully demonstrated synaptic transistors showing good linearity (αpd = 1.8/0.5), a high transconductance ratio (6300), and very good stability. High learning accuracy of 97% was obtained in the training of 1 million MNIST images based on the device characteristics.

Original languageEnglish
Pages (from-to)7372-7380
Number of pages9
JournalACS Applied Materials and Interfaces
Issue number6
StatePublished - 2020 Feb 12


  • III-V
  • artificial neural network
  • monolithic 3D integration
  • neuromorphic
  • synapse

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