Journal
APPLIED PHYSICS LETTERS
Volume 98, Issue 3, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3543851
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- Fondazione Cariplo [2007.5095]
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The bandstructure line-up of Fe/MgO/Ge heterostructures with various Ge doping has been determined by x-ray photoemission spectroscopy. The MgO layer causes a sizable depinning of the Fermi level in Ge for light n-(10(15) cm(-3)) and moderate p-doping (10(18) cm(-3)), but not for heavy n-doping (10(20) cm(-3)). The Fermi level instead stays essentially in the middle of the MgO gap for all the investigated doping. This picture agrees with transport measurements only for moderate n- or p-doping, while we demonstrate that for heavy n-doping the analysis of the conductance versus temperature fails in predicting the Schottky barrier height. (C) 2011 American Institute of Physics. [doi:10.1063/1.3543851]
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