We present a nanoelectromechanical (NEM) relay that is capable of demonstrating two stable states without on-hold power due to the influence of van der Waals force. This is realized by leveraging a silicon nanofin (SiNF) as a relay that can switch between two lateral terminals. The smallest dimension of the SiNF is 80-nm width by 2-μm length. The SiNF is able to maintain its geometrical position even after the bias voltage is turned off. Bistable hysteresis behavior with pull-in voltage (V PI ) and reset voltage (V RESET ) as low as 8.4 and 10.1 V is measured. The nanoscale footprint of this device shows great potential for high-density nonvolatile memory applications.[
2013-0109]Index Terms-Nanoelectromechanical systems, relay, switch, van der Waals, nonvolatile memory, Bistable, electrostatic.
I. IntroductionThe ever quest in CMOS scaling has expanded the exploration boundary beyond conventional transistor, listing from quantum devices, ultrathin body silicon on insulator (SOI), fin-FET, and so on. Most devices leverage on the transportation of electrons or the same to determine the on-off criteria [1], [2]. Until recently, nanoelectromechanical (NEM) relay has drawn great attention due to its exceptional properties. NEM relay is a physically actuated nanoscale mechanical switch that does not rely on transportation or storage of charges. Instead, NEM relay relies on mechanical switching motion and geometrical shape to replicate logic operation in transistor and solid state nonvolatile memory (NVM) and its advantages include extremely low off-state leakage current, steep sub-threshold slopes, and capability of high temperature operation [3]- [5]. It is already reported that the NEMS relay can complement CMOS circuits resulting in faster operation and erasing speed [6], [7]. Besides that, reports suggest that the NEM switches can overcome poor performance usually at the extremes of temperature because of their mechanical switching nature