| AVS 63rd International Symposium & Exhibition | |
| 2D Materials Focus Topic | Thursday Sessions |
| Session 2D-ThA |
| Session: | Surface Chemistry, Functionalization, Bio and Sensor Applications of 2D Materials |
| Presenter: | Sourav Garg, University of Alabama |
| Authors: | S. Garg, University of Alabama J. Waters, University of Alabama A. Shahab, University of Alabama M. Singla, University of Alabama S. Kim, University of Alabama P. Kung, University of Alabama |
| Correspondent: | Click to Email |
Although graphene has been widely studied for its 2D properties, its zero band gap nature limits its potential role in semiconducting applications. Molybdenum disulphide (MoS2) is a semiconductor whose bandgap changes from indirect to direct due to the disappearance of the inversion symmetry when the material is in a monolayer form and in addition this breaking of the symmetry between the K and K' valleys intensifies its use in valleytronic applications. Understanding the correlation between electrical and optical characteristics of MoS2 is important in order to realize optoelectronic devices based on these materials, including for sensing and biological applications.
In the present work, we investigate and compare the electrical transport characteristics of MoS2 in monolayer and bilayer forms under the influence of an optical excitation and temperature, through the realization and measurement of MoS2 interdigitated patterned devices. MoS2 monolayer and bilayer sheets were synthesized by chemical vapor deposition in an oxygen-free environment on basal plane sapphire substrates. Interdigitated metal contacts were realized using conventional optical lithography with channel lengths ranging from 5 to 10 micrometer. The response of the resulting device was characterized as a function of incident light intensity, wavelength, applied bias, and temperature. We further investigate the impact of these properties on the realization of chemical sensor devices using MoS2.