Abstract:
Charge carriers in graphene mimic two-dimensional massless Dirac fermions with linear energy dispersion, resulting in unique optical and electronic properties. They exhibit high mobility and strong interaction with electromagnetic radiation over a broad frequency range. Interband transitions in graphene give rise to pronounced optical absorption in the mid-infrared to visible spectral range. Free-carrier intraband transitions, on the other hand, cause low frequency absorption, which varies significantly with charge density and results in strong light extinction at high carrier density. These properties together suggest a rich variety of possible optoelectronic applications for graphene. But graphene is a zero bandgap material which hinders the uses of graphene in luminescent application.
In this thesis paper, we have addressed this bandgap problem and reviewed some of the important achievements so far in introducing bandgap in graphene.we have also investigated the optoelectronic properties of graphene and reviewed some of the significant applications.Later, we have discussed about graphene quantum dot and their applications in multicolor light emitting applications and in solar cells
