Journal
IEEE JOURNAL OF QUANTUM ELECTRONICS
Volume 49, Issue 7, Pages 589-594Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JQE.2013.2261472
Keywords
Graphene; Si; Schottky diode; Detector
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This paper reports on photodetection properties of the graphene-Si schottky junction by measuring current-voltage characteristics under 1.55-mu m excitation laser. The measurements have been done on a junction fabricated by depositing mechanically exfoliated natural graphite on top of the pre-patterned silicon substrate. The electrical Schottky barrier height is estimated to be (0.44-0.47) eV with a minimum responsivity of 2.8 mA/W corresponding to an internal quantum efficiency of 10%, which is almost an order of magnitude larger than regular Schottky junctions. A possible explanation for the large quantum efficiency related to the 2-D nature of graphene is discussed. Large quantum efficiency, room temperature IR detection, ease of fabrication along with compatibility with Si devices can open a doorway for novel graphene-based photodetectors.
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