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Spatial metrology of dopants in silicon with exact lattice site precision

Abstract

Scaling of Si-based nanoelectronics has reached the regime where device function is affected not only by the presence of individual dopants, but also by their positions in the crystal. Determination of the precise dopant location is an unsolved problem in applications from channel doping in ultrascaled transistors to quantum information processing. Here, we establish a metrology combining low-temperature scanning tunnelling microscopy (STM) imaging and a comprehensive quantum treatment of the dopant–STM system to pinpoint the exact coordinates of the dopant in the Si crystal. The technique is underpinned by the observation that STM images contain atomic-sized features in ordered patterns that are highly sensitive to the STM tip orbital and the absolute dopant lattice site. The demonstrated ability to determine the locations of P and As dopants to 5 nm depths will provide critical information for the design and optimization of nanoscale devices for classical and quantum computing applications.

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Figure 1: STM-based metrology for the exact position of subsurface dopants in silicon.
Figure 2: STM tip orbital dependence.
Figure 3: Unique lattice site assignment for the P-1 dopant by depth analysis.
Figure 4: Pinpointing dopant location with single-lattice-site precision.

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Acknowledgements

This work is funded by the Australian Research Council Center of Excellence for Quantum Computation and Communication Technology (CE110001027) and in part by the US Army Research Office (W911NF-08-1-0527). M.Y.S. acknowledges an ARC Laureate Fellowship. This work is supported by the European Commission Future and Emerging Technologies Proactive Project MULTI (317707). Computational resources are acknowledged from NCN/Nanohub. M.U. thanks C. Hill and V. Perunicic for discussions.

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Contributions

L.C.L.H. and M.U. formulated the theoretical framework for the metrology scheme, including tight-binding calculations of the STM images with generic tip orbitals with input from J.S. M.U. performed the theoretical calculations. J.B., J.S., B.V., M.Y.S. and S.R. designed and conducted the STM measurements. L.C.L.H. and M.U. wrote the manuscript with input from all authors.

Corresponding authors

Correspondence to M. Usman or L. C. L. Hollenberg.

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The authors declare no competing financial interests.

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Usman, M., Bocquel, J., Salfi, J. et al. Spatial metrology of dopants in silicon with exact lattice site precision. Nature Nanotech 11, 763–768 (2016). https://doi.org/10.1038/nnano.2016.83

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