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Title: Enhanced Donor Binding Energy Close to a Semiconductor Surface
Authors: Wijnheijmer, A.P.
Garleff, J.K.
Teichmann, K.
Wenderoth, M.
Loth, S.
Ulbrich, R.G.
Maksym, P.A.
Roy, Mervyn
Koenraad, P.M.
First Published: 24-Apr-2009
Publisher: American Physical Society
Citation: Physical Review Letters, 2009, 102, 166101.
Abstract: We measured the ionization threshold voltage of individual impurities close to a semiconductor-vacuum interface, where we use the STM tip to ionize individual donors. We observe a reversed order of ionization with depth below the surface, which proves that the binding energy is enhanced towards the surface. This is in contrast to the predicted reduction for a Coulombic impurity in the effective mass approach. We can estimate the binding energy from the ionization threshold and show experimentally that in the case of silicon doped gallium arsenide the binding energy gradually increases over the last 1.2 nm below the (110) surface.
ISSN: 0031-9007
Type: Article
Description: This paper was published as Physical Review Letters, 2009, 102, 166101. Copyright American Physical Society. It is available from Doi: 10.1103/PhysRevLett.102.166101
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Appears in Collections:Published Articles, Dept. of Physics and Astronomy

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