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Posted: Feb 22, 2017
A new contact to the two-dimensional world
(Nanowerk Spotlight) Your laptop or cellphone becomes very hot after intensive use like playing video games. This is because much of the electric energy is wasted in the form of heat, particularly at the contact between metal and semiconductor.
Metal and semiconductors are important components in most electronic devices, so is their contact. To minimize the energy dissipation and improve the device performance, it is critical to reduce the contact resistance.
However, this is challenging for next-generation electronics based on two-dimensional (2D) semiconductors, which have a significantly higher resistance than conventional silicon-based electronics.
Two-dimensional semiconductors, such as MoS2 and WSe2, have a thickness of only one or few atomic layers. This extreme thickness makes the materials largely exposed to the environment, so one can have a better control on the materials by using external electric field. This property makes them promising for next-generation electronics.
The team demonstrates the potential of MXenes as Schottky-barrier-free metal contacts to 2D semiconductors, providing a solution to the contact-resistance problem in 2D electronics. (Reprinted with permission by American Chemical Society)
This study enhances the understanding of the correlation between surface chemistry and electronic/transport properties of 2D materials, and also gives practical predictions for improving 2D electronics.
Source: Materials and Process Simulation Center at California Institute of Technology