Franz–Keldysh oscillations originating from a well-controlled electric field in the GaAs depletion region
- 13 February 1989
- journal article
- Published by AIP Publishing in Applied Physics Letters
- Vol. 54 (7) , 608-610
- https://doi.org/10.1063/1.100893
Abstract
The Franz–Keldysh oscillations induced by the electric field in the depleted zone below the GaAs surface are studied by photoreflectance spectroscopy. The electric field is precisely controlled by a molecular beam epitaxy grown buried highly doped layer and the pinned position of the Fermi level at the surface. It is shown that the electric field value as derived from theory is in disagreement with the value derived from electrostatic calculations. Consequently a determination of the Fermi level pinning is only possible from a measurement of both n‐ and p‐doped samples.Keywords
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