Physics

Dr. Chandan Biswas
University of Texas, US

Abstract:

Low-dimensional nanomaterials such as zero dimensional (0D) quantum dots, one dimensional (1D) carbon nanotubes, two dimensional (2D) graphene and transitionmetal dichalcogenides (TMDs) exhibit distinct electronic and optoelectronic properties compared to the conventional semiconductors. 2D heterostructures recently unveiled unique electronic and optoelectronic properties and established a new field of study. A class of new materials with extraordinary electrical and optoelectronic properties can be achieved by incorporating tunable band gap semiconducting, metallic, insulating and superconducting 0D-2D heterostructures. This seminar will summarize i) the tremendous research potentials of 0D-2D heterostructures and its electronic and optoelectronic properties, ii) optoelectronic properties of 0D incorporated heterostructures, iii) carbon based transparent conducting films incorporating CNTs, Graphene and nanocomposite materials, iv) electronic and optoelectronic properties of various 2D van der Waals nanomaterials (such as graphene, semiconducting WSe2 and superconducting NbSe2). Numerous fundamental light-matter interaction phenomena such as carrier multiplication, optical Stark effect, bi-exciton dynamics, hot carrier direct band-to-band tunneling, photon-electron quenching, 2D vertical tunnel devices and fast energy conversion can be achieved in 0D-2D heterostructures. The outcome of such a scheme would certainly make a strong impact uncovering new insides to the optoelectronic research community.