Nanowatt use 8 V switching nonvolatile memory transistors with 2D MoTe₂ channel and ferroelectric P(VDF-TrFE)

Two dimensional (2D) p-MoTe₂ channel-based nonvolatile memory transistors with ferroelectric P(VDF-TrFE) polymer has been studied using a bottom-gate device architecture, which is introduced to dramatically reduce both of the switching and drain voltages to minimum 8 V and 10 mV, respectively. In fact, most of 2D-channel ferroelectric FETs with the same P(VDF-TrFE) polymer have used top-gate architectures, utilizing high switching pulse voltages over 20–25 V due to the existence of dead layer, which is unavoidably formed at the interface between P(VDF-TrFE) and thermal-deposited Al top gate. Key effects to realize such a low 8–13 V switching thus originate from the bottom-gate architecture. On the one hand, keys to obtain the low operation/drain voltage come from anneal-free Ohmic contact which is obtained using H₂O₂ solution. Thanks to the low operation voltages of 10 mV, consuming power in the nonvolatile FETs can be minimized to ~a few pW for OFF/Erase state and ~a few hundred pW for ON/Program although it eventually becomes ~nW and ~30 nW for OFF and ON states in a practical circuit operation to switch organic light emitting diodes. Our approaches of bottom-gate architecture and H₂O₂ contact nicely work even for transparent nonvolatile memory FET.