Multi-parametric growth of silicon nanowires in a single platform by laser-induced localized heat sources

Abstract

Nanoscale-synthesized materials hold great promise for the realization of future generation devices. In order to fulfil this exceptional promise, new techniques must be developed that will enable the precise layout and assembly of the heterogeneous components into functional 'superblocks'. Direct synthesis of nanostructures via a laser-assisted chemical vapor deposition process is one promising route. In this paper, laser-assisted silicon nanowire growth based on a vapor-liquid-solid (VLS) mechanism is studied. Spatial confinement of the nanowire growth region via focused laser beam illumination provides a convenient way to examine multiple growth parameters (temperature, time, illumination direction, gas species composition, and pressure), thereby elucidating fundamental mechanisms of laser-assisted growth in a single sample configuration. Furthermore, the work demonstrates an advanced method for direct synthesis of nanostructures for the purpose of practical rapid patterning.

Site Selective Doping of Ultrathin Metal Dichalcogenides by Laser‐Assisted Reaction

“…It is known that the laser-assisted thermochemical processing provides a convenient means for systematically and rapidly accessing a wide parameter space in a single sample confi guration. [34][35][36] The enhancement of the PL peak intensity of monolayer MoS 2 at a fi xed laser power exhibits an approximately linear dependence on the laser illumination time (Figure 2 c, inset), which implies monotonically increasing hole doping over the laser illumination time. At a fi xed laser power of 200 mW and exposure times of 10, 60, and 120 s with the PL intensity was enhanced by 1.6, 5, and 10 times, respectively.…”

Significant thermal conductivity reduction of silicon nanowire forests through discrete surface doping of germanium

“…Electronic mail: dpoulikakos@ethz.ch 0003-6951/2015/106(9)/093102/5/$30.00 V C 2015 AIP Publishing LLC 106, 093102-1 Different ways of fabricating nanowires were reported. [23][24][25][26] In our work, the SiNW arrays were fabricated by combining metal assisted etching and nanosphere lithography. 23,24 Figure 2 shows the fabrication process of the vertically aligned SiNW arrays.…”

Role of enhanced laser field in laser processing of nanomaterials

“…Laser induced selective heating of various material systems has been implemented in applications ranging from nanomaterials synthesis [1] to display device fabrication [2]. It is known that light interaction with appropriate nanoscaled features can result in the enhanced laser field in the specific portion of specimen, which is a phenomenon that electro-magnetic field acting on the surface of nanomaterials is intensified in a significant order [3].…”