Fig. 2: Modulation of electrical conductances by ion implantation.
From: Enhanced analog synaptic behavior of SiNx/a-Si bilayer memristors through Ge implantation

Characteristic current–voltage curves of a an SiNx/a-Si bilayer memristor device and b an a-Si single layer device with and without implantation. The voltage was swept repetitively following the sequence 0 → +5 → 0 → −5 → 0. c XTEM image of an implanted a-Si on a p++ crystalline Si wafer. d Ge and defect (vacancy) distributions simulated by TRIM, and Ge atomic fraction determined by EDX.