Improving the Performance of Charge Trapping MemTransistor as Synaptic Device by Ti-doped HfO2

Yu Che Chou, Wan Hsuan Chung, Chien Wei Tsai, Chin Ya Yi, Chao-Hsin Chien

Research output: Contribution to journalArticlepeer-review


In this work, we improved the performance of germanium (Ge) channel Charge Trapping MemTransistors (CTMTs) as synaptic device by using Ti-doped HfO2 as charge trapping layer (CTL). We manipulated the amount of Ti dopant within the HfO2 CTL to perform the band engineering by varying the Hf/Ti cycle ratio in atomic layer deposition (ALD). The content of Ti was quantified and the energy band structures of the gate stack was constructed with the aid of transmission electron microscope (TEM) images and X-ray photoelectron spectroscopy (XPS) analysis. We then fabricated the charge trapping capacitors and characterized their memory characteristics such as memory windows. By the implementation of amphoteric trap model, thermal activated electron retention model and advanced charge decay model, the trap distribution of the CTL was extracted. Finally, we fabricated the CTMTs with Ti-doped HfO2 as the CTL and characterized their performance as synaptic device such as nonlinearity of depression and potentiation and also conductance on/off ratio. We used NeuroSim simulator with multilayer perceptron and convolutional neural network models to evaluate the pattern recognition accuracy of neural network hardware accelerator using CTMTs as synaptic devices and benchmarked the performance of our CTMT with those of other types of synaptic devices.

Original languageEnglish
Article number9296335
Pages (from-to)137-143
Number of pages7
JournalIEEE Journal of the Electron Devices Society
StatePublished - 16 Dec 2020


  • Analog memories
  • Artificial intelligence
  • Computer architecture
  • Dielectric materials
  • Electron traps
  • Germanium
  • Hafnium oxide
  • Logic gates
  • Neural network hardware
  • Pattern recognition
  • Performance evaluation
  • Semiconductor memories.
  • Temperature measurement


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