Direct contacts of a metal with atomically thin two-dimensional (2D) transition metal dichalcogenide (TMDC) semiconductors have been found to suppress device performance by producing a high contact resistance. NbS2 is a 2D TMDC and a conductor. It is expected to form ohmic contacts with 2D semiconductors because of its high work function and the van der Waals interface it forms with the semiconductor, with such an interface resulting in weak Fermi level pinning. Despite the usefulness of NbS2 as an electrode, previous synthesis methods could not control the thickness, uniformity, and shape of the NbS2 film and hence could not find practical applications in electronics. Here, we report a patternable method for carrying out the synthesis of NbS2 films in which the number of NbS2 layers formed over a large area was successfully controlled, which is necessary for the production of customized electrodes. The synthesized NbS2 films were shown to be highly transparent and uniform in thickness and conductivity over the large area. Furthermore, the synthesized NbS2 showed half the contact resistance than did the molybdenum metal in MoS2 field effect transistors (FETs) on a large transparent quartz substrate. The MoS2 device with NbS2 showed an electron mobility as high as 12.7 cm2 V-1 s-1, which was three times higher than that found for the corresponding molybdenum-contacted MoS2 device. This result showed the high potential of the NbS2 thin film as a transparent electrode for 2D transition metal dichalcogenide (TMDC) semiconductors with low contact resistance.
Bibliographical noteFunding Information:
This study was supported by an Institute for Information & Communications Technology Promotion (IITP) grant (B0117-16-1003, fundamental technologies of 2D materials and devices for the platform of new-functional smart devices), the Basic Science Research Program (2016R1A2B4012931, 2015R1A2A2A01006992) and the Global Frontier Research Center for Advanced Soft Electronics (2011-0031630) through a National Research Foundation of Korea grant funded by the Korean government Ministry of Science, ICT and Future Planning.
All Science Journal Classification (ASJC) codes
- Materials Science(all)