Mapping the potential within a nanoscale undoped GaAs region using a scanning electron microscope

Details Mapping the potential within a nanoscale undoped GaAs region using a scanning electron microscope Mapping the potential within a nanoscale undoped GaAs region using a scanning electron microscope

2004-08-06

arxiv.org/abs/cond-mat/0408146v1

Appl. Phys. Lett. Vol 84, pp. 2109-2111, 2004

Physics

Condensed Matter

Materials Science

7 pages, 3 figures

Scientific paper

10.1063/1.1689755

Semiconductor dopant profiling using secondary electron imaging in a scanning electron microscope (SEM) has been developed in recent years. In this paper, we show that the mechanism behind it also allows mapping of the electric potential of undoped regions. By using an unbiased GaAs/AlGaAs heterostructure, this article demonstrates the direct observation of the electrostatic potential variation inside a 90nm wide undoped GaAs channel surrounded by ionized dopants. The secondary electron emission intensities are compared with two-dimensional numerical solutions of the electric potential.

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