Hysteresis in Lanthanide Aluminum Oxides Observed by Fast Pulse CV Measurement

Abstract

Oxide materials with large dielectric constants (so-called high -k dielectrics) have attracted much attention due to their potential use as gate dielectrics in Metal Oxide Semiconductor Field Effect Transistors (MOSFETs). A novel characterization (pulse capacitance-voltage) method was proposed in detail. The pulse capacitance-voltage technique was employed to characterize oxide traps of high -k dielectrics based on the Metal Oxide Semiconductor (MOS) capacitor structure. The variation of flat-band voltages of the MOS structure was observed and discussed accordingly. Some interesting trapping/detrapping results related to the lanthanide aluminum oxide traps were identified for possible application in Flash memory technology. After understanding the trapping/detrapping mechanism of the high -k oxides, a solid foundation was prepared for further exploration into charge-trapping non-volatile memory in the future.