P-type polar transition of chemically doped multilayer MoS2 transistor

The accessibility of both n-type and p-type MoS2 FET is necessary for complementary device applications involving MoS2. However, MoS2 PFET is rarely achieved due to pinning effect resulting high Rc at metal-MoS2 interface and the inherently strong n-type property of the MoS2 material. In this study, we realized a high-performance multi-layer MoS2 PFET via controllable chemical doping, which has an excellent on/off ratio of 107 and a maximum hole mobility of 72 cm2/Vs at room temperature, and these values are further exceeding to 109 and 132 cm2/Vs at 133K. In addition, we revealed that large Rc hindered the polar transition of MoS2 FET from n-type to p-type, meanwhile channel Rs limited Ion of PFET. Therefore it is suggested that reducing Rc at high work function metal-MoS2 interface and p-type doping of channel were necessary for achieving high performance MoS2 PFET. Based on the high performance PFET, we successfully demonstrated a MoS2 CMOS inverter by integrating NFET and PFET.

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