Graphite based Schottky diodes formed on Si, GaAs, and 4H-SiC substrates

Tongay, S.; Schumann, T.; Hebard, A. F.
November 2009
Applied Physics Letters;11/30/2009, Vol. 95 Issue 22, p222103
Academic Journal
We demonstrate the formation of semimetal graphite/semiconductor Schottky barriers where the semiconductor is either silicon (Si), gallium arsenide (GaAs), or 4H-silicon carbide (4H-SiC). Near room temperature, the forward-bias diode characteristics are well described by thermionic emission, and the extracted barrier heights, which are confirmed by capacitance voltage measurements, roughly follow the Schottky–Mott relation. Since the outermost layer of the graphite electrode is a single graphene sheet, we expect that graphene/semiconductor barriers will manifest similar behavior.


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