| 研究実績の概要 |
To assure the safety and reliability of the sustainable development of human society, it is important to develop miscellaneous electronic and optoelectronic applications for monitoring our daily environments timely, such as transistors, biochemical sensors, photodetectors and so forth. In this proposal, the strain-induced change of charge transfer between the two-dimensional sensing material, named graphene, and the chemical molecules, such as water and other toxic gas were investigated by using first-principle calculations based on the density functional theory. The strain-induced change of sensing mechanism of graphene with target molecules were clarified.
Instead of gapless graphene, a new type of 2D material with a layered crystal structure and a direct bandgap around 1.65 eV in the visible region was investigated, named germanium monosulfide (GeS). In the last year, the applicant has been working on the synthesization of the GeS by using a physical vapor transport method. High quality single-crystalline GeS in size of several tens of micrometers was successfully synthesized. The various morphology of single-crystalline GeS and the anisotropic behaviors of electron-phonon interaction were observed. It shows major potential for development of next-generation electronic and optoelectronic applications, such as transistors, biochemical sensors, photodetectors, and even light-emitters.
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