Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1795306 | Journal of Crystal Growth | 2007 | 4 Pages |
Abstract
The electronic density of states at clean surfaces of n-type In0.53Ga0.47As, grown by molecular beam epitaxy on lattice-matched (0Â 0Â 1)- and (1Â 1Â 1)A-oriented InP substrates, was measured by low-temperature scanning tunneling spectroscopy under ultra-high vacuum. It was found that the surface Fermi level (FL) pinning strength dramatically depends on crystal orientation. The FL at the (0Â 0Â 1)-(2Ã4) surface is pinned near midgap, independently of the dopant concentration in the bulk. In contrast, the FL at the (1Â 1Â 1)A-(2Ã2) surface lies in the conduction band, close to the bulk FL, and increases with dopant concentration.
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Condensed Matter Physics
Authors
Simon Perraud, Kiyoshi Kanisawa, Zhao-Zhong Wang, Yoshiro Hirayama,