An ovonic threshold switching selector based on Se-rich GeSe chalcogenide

In this work, an ovonic threshold switching (OTS) selector with simply binary GeSe has been demonstrated. According to mean coordination number theory, Se-rich GeSe was chosen as the dielectric layer. Meanwhile, annealing process was attempted to reduce defect quantity and enhance atomic structure stability. The results showed improving selector performance such as low off current (< 0.1 nA at similar to 1 V), high on current (> 1 mA at similar to 2 V), extremely sharp switching slope (< 3 mv/dec), fast operating speed (turn-on time < 100 ns). In addition, the mechanism of trap-assisted Poole-Frenkel conduction has been deduced to explain the reasons for improvements induced by annealing.