The art of ultra-manipulable van der Waal materials and their heterostructures have been playing a pivotal role for new discoveries. Although various proof-of-concepts based optoelectronic devices have been demonstrated, fabrication routes with in-situ tuning of structural, optical, electronic and magnetic properties have not yet been accomplished in any multicomponent 2D system. Our research focuses a combination of materials synthesis, heterostructuring and in-situ optoelectronic device characterization to engineer the on-demand control of quantum properties in research areas pertaining to stretchable and flexible nanoelectronics, optoelectronics, valleytronics, spintronics, and so on. We are exploring the CVD strategies to directly synthesize wide range of 2D materials and their heterostructures in the form of lateral and vertical configuration. Emphasis are given to transition metal mono/di-chalcogenides, graphene, BN, perovskites, and their heterostructures. The critical parameters that need to be controlled for the preparation of optoelectronic quality 2D films are stoichiometry, thickness, scalability (> 1 cm2), crystallographic orientation, domain size and surface roughness. We are tailoring their optical, electronic and magnetic parameters through doping and alloying pathways. Site specific modulation of charge carriers such as electron, hole, exciton (trion and biexciton) and polaritons in the 2D host materials with desired properties necessitates a level of understanding for designing next-generation materials that will meet the requirements for attaining a sustainable society in the near future.
One-pot growth of two-dimensional lateral heterostructures via sequential edge-epitaxy by Sahoo P. K. Nature 553 63-67 (2018)
Bilayer Lateral Heterostructures of Transition-Metal Dichalcogenides and Their Optoelectronic Response by Sahoo P. K. ACS Nano 13 12372-12384 (2019)
Controlled Growth of Two-Dimensional Lateral and Vertical Heterostructures and Characterizations ISIRD, SRIC
Area of Research: 2D materials and Heterostructures