Temperature-dependent electronic transport in reconfigurable transistors based on Ge on SOI and strained SOI platforms
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The integration of high-k gate dielectrics with two-dimensional (2D) semiconducting channel materials is essential for high-performance and low-power electronics. However, the conformal deposition of a uniform high-k dielectric with sub-1-nm equivalent oxide thickness (EOT) and high interface quality on high-mobility 2D semiconductors is still challenging. Here we report a facile approach to synthesize a uniform high-k (ε r ~ 22) amorphous native oxide Bi 2 SeO x on the 2D semiconducting Bi2O2Se using O 2 plasma at room temperature. The conformal native oxide can directly serve as gate dielectrics with EOT of ~0.9 nm, while the original properties of underlying 2D Bi 2 O 2 Se is preserved. Furthermore, high-resolution area-selective oxidation of Bi 2 O 2 Se is achieved to fabricate discrete electronic components. This facile integration of a 2D semiconductor and its high-k native oxide holds high promise for next-generation nanoelectronics.
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