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    Breaking News

    Imec Reports Direct Growth of 2D Materials on 300mm Wafers for First Time

    2D materials could provide the path towards extreme device-dimension scaling.

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    12.04.18
    This week, at the 2018 IEEE International Electron Devices Meeting (IEDM), imec presents a 300mm-wafer platform for MOSFET devices with 2D materials. 2D materials could provide the path towards extreme device-dimension scaling as they are atomically precise and suffer little from short channel effects. Other possible applications of 2D materials could come from using them as switches in the BEOL, which puts an upper limit on the allowed temperature budget in the integration flow.
     
    The imec platform integrates as transistor channel WS2, a 2D material which holds promise for higher ON current compared to most other 2D materials and good chemical stability. Imec reports here for the first time the MOCVD growth of WS2 on 300mm wafers, a key process step for device fabrication. The benefits of the MOCVD growth come at the price of a high temperature while growing the material.
     
    To build a device integration flow which could be compatible with BEOL requirements, the transfer of the channel material from a growth substrate to a device wafer is crucial. Imec is the first to demonstrate a full 300mm monolayer 2D material transfer, which is challenging on its own because of the low adhesion of 2D materials to the device wafer and to the extreme thinness of the material transferred: 0.7nm.
     
    The transfer process was developed together with SUSS MicroTec and Brewer Science using temporary bonding and debonding technologies. WS2 wafers are temporarily bonded to glass carrier wafers using a specially formulated material (Brewer Science). Next, the WS2 monolayer is mechanically debonded from the growth wafer and bonded again in vacuum to the device wafer. The carrier wafer is removed using laser debonding. This debonding technique is a key enabler for the controlled transfer of 2D materials
     
    “Building the 300mm platform for MOSFET device study with 2D materials and developing the process step ecosystem speeds-up the technological adoption of these materials,” Iuliana Radu, Beyond CMOS program director at imec, said. “Several challenges are still to be resolved and are the subject of ongoing research and development.”
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