Intensifying MoS2 Bilayers by Quadrupole Gap Plasmons for Excellent Hydrogen Evolution Reaction and by Morphology-controlled Plasmonic Nanostructures towards Superior Photodetectors

Ta-Jen YEN^1*

¹Materials Science and Engineering, NTHU, Hsinchu, Taiwan

* Presenter:Ta-Jen YEN, email:tjyen@mx.nthu.edu.tw

Recently, extracting hot electrons from plasmonic nanostructures and utilizing them to enhance the optical quantum yield of 2D transition-metal dichalcogenides (TMDs) have been topics of interest in the field of optoelectronic device applications, such as hydrogen evolution reaction (HER), solar cells, light emitting diodes, photodetectors and so on. The coupling of plasmonic nanostructures with nanolayers of TMDs depends on the optical properties of the plasmonic materials, including radiation pattern, resonance strength, and hot electron injection efficiency. In this talk, I will present both top-down and bottom-up methods to maximize nanoscale light-matter interactions - the former tailored nano-antennas, the latter morphology-controlled plasmonic nanoparticles. For example, the optimized nanoantennas are employed on a chemical vapor reaction (CVR)-grown bilayer molybdenum disulfide (MoS2) to tune and intensify the optical response of MoS2. The optimized QGP structure performance enhanced by a factor of 27.87 and beneficial continuous bilayer MoS2 can be applied in HER with superior outcomes. Besides, by decorating our MoS2 with four different morphology-controlled plasmonic nanoparticles, we allow engineering the bandgap of the bilayer MoS2 due to localized strain that stems up from plasmonic nanoparticles, leading to 32 times enhanced photoresponse.

Keywords: nano-antennas, hydrogen evolution reaction (HER), Photodetection