Publication Date:
2015-01-27
Description:
Recently proposed novel neural network hardware designs imply the use of memristors as electronic synapses in 3D cross-bar architecture. Atomic layer deposition (ALD) is the most feasible technique to fabricate such arrays. In this work, we present the results of the detailed investigation of the gradual resistive switching (memristive) effect in nanometer thick fully ALD grown TiN/HfO 2 /TiN stacks. The modelling of the I-V curves confirms interface limited trap-assisted-tunneling mechanism along the oxygen vacancies in HfO 2 in all conduction states. The resistivity of the stack is found to critically depend upon the distance from the interface to the first trap in HfO 2 . The memristive properties of ALD grown TiN/HfO 2 /TiN devices are correlated with the demonstrated neuromorphic functionalities, such as long-term potentiation/depression and spike-timing dependent plasticity, thus indicating their potential as electronic synapses in neuromorphic hardware.
Print ISSN:
0021-8979
Electronic ISSN:
1089-7550
Topics:
Physics
