High-Performance MoS2 Field-Effect Transistors Enabled by Chloride   Doping: Record Low Contact Resistance (0.5 kohm*um) and Record High Drain   Current (460 uA/um)
  In this paper, we report a novel chemical doping technique to reduce the contact resistance (Rc) of transition metal dichalcogenides (TMDs) - eliminating two major roadblocks (namely, doping and high Rc) towards demonstration of high-performance TMDs field-effect transistors (FETs). By using 1,2 dichloroethane (DCE) as the doping reagent, we demonstrate an active n-type doping density > 2*1019 cm-3 in a few-layer MoS2 film. This enabled us to reduce the Rc value to a record low number of 0.5 kohm*um, which is ~10x lower than the control sample without doping. The corresponding specific contact resistivity (pc) is found to decrease by two orders of magnitude. With such low Rc, we demonstrate 100 nm channel length (Lch) MoS2 FET with a drain current (Ids) of 460 uA/um at Vds = 1.6 V, which is twice the best value reported so far on MoS2 FETs. 
Lingming Yang, Kausik Majumdar, Yuchen Du, Han Liu, Heng Wu, Michael   Hatzistergos, Py Hung, Robert Tieckelmann, Wilman Tsa...
cond-mat.mtrl-sci cond-mat.mes-hall