Investigation on the Dominant Key to Achieve Superior Ge Surface Passivation by GeOx Based on the Ozone Oxidation
Jie Zhang, Shuhua Wei, Jing Zhang, Xiaolei Wang, Wenwu Wang
Available Online August 2016.
- https://doi.org/10.2991/cset-16.2016.73How to use a DOI?
- Ge, MOS, XPS, interface trap density, passivation
- The dominant key to achieve superior Ge surface passivation by GeOx interfacial layer is investigated based on ozone oxidation. The interface state density (Dit) measured from low temperature conduction method is found to decrease with increasing the GeOx thickness (0.26-1.06 nm). The X-ray photoelectron spectroscopy (XPS) is employed to demonstrate the interfacial structure of GeOx/Ge with different GeOx thicknesses. And the XPS results show that Ge3+ oxide component is responsible to the decrease of the Dit due to the effective passivation of Ge dangling bonds. Therefore, the formation of Ge3+ component is the dominant key to achieve low Dit for Ge gate stacks. Our work confirms that the same physical mechanism determines the Ge surface passivation by the GeOx regardless of the oxidation methods to grow the GeOx interfacial layer. As a result, to explore a growth process that can realize sufficient Ge3+ component in the GeOx interlayer as thin as possible is important to achieve both equivalent oxide thickness scaling and superior interfacial property simultaneously. This conclusion is helpful to engineer the optimization of the Ge gate stacks.
- Open Access
- This is an open access article distributed under the CC BY-NC license.
Cite this article
TY - CONF AU - Jie Zhang AU - Shuhua Wei AU - Jing Zhang AU - Xiaolei Wang AU - Wenwu Wang PY - 2016/08 DA - 2016/08 TI - Investigation on the Dominant Key to Achieve Superior Ge Surface Passivation by GeOx Based on the Ozone Oxidation BT - 2016 International Conference on Computer Science and Electronic Technology PB - Atlantis Press SN - 2352-538X UR - https://doi.org/10.2991/cset-16.2016.73 DO - https://doi.org/10.2991/cset-16.2016.73 ID - Zhang2016/08 ER -