Capacitance-Voltage (C-V) Characterization of Graphene-Silicon Heterojunction Photodiodes

Heterostructures of 2D and 3D materials form efficient devices for utilizing the properties of both classes of materials. Graphene/silicon (G/Si) Schottky diodes have been studied extensively with respect to their optoelectronic properties. Here, a method to analyze measured capacitance-voltage (C-V) data of G/Si Schottky diodes connected in parallel with G/silicon dioxide/Si (GIS) capacitors is introduced. The accurate extraction of the built-in potential (phi(bi)) and the Schottky barrier height (SBH) from the measurement data independent of the Richardson constant is also demonstrated.