Open AccessНизкотемпературная фотолюминесценция монослоя WSe-=SUB=-2-=/SUB=-, полученного механическим слоением с использованием золота
Author(s) -
С. Н. Николаев,
В. С. Багаев,
M. A. Chernopitsskii,
I. I. Usmanov,
Е. Е. Онищенко,
Aleksandra Deeva,
В. С. Кривобок
Publication year - 2022
Publication title -
fizika i tehnika poluprovodnikov
Language(s) - English
Resource type - Journals
eISSN - 1726-7315
pISSN - 0015-3222
DOI - 10.21883/ftp.2022.03.52120.9772
Subject(s) - monolayer , materials science , photoluminescence , exciton , exfoliation joint , raman spectroscopy , raman scattering , thin film , spectral line , scattering , doping , radiative transfer , optoelectronics , optics , condensed matter physics , nanotechnology , graphene , physics , astronomy
We studied the optical properties of an atomically thin WSe$_2$ film obtained by gold-assisted mechanical exfoliation. Raman scattering spectra, low-temperature photoluminescence, and micro-reflection from large-scale monolayer are investigated. At room temperature, the optical properties of such a film reproduce the properties of WSe$_2$ monolayers obtained by regular mechanical exfoliation. It is shown that at low temperatures, the radiation spectra of the resulting film are determined by standard mechanisms of radiative recombination involving free excitons, bound excitons, and trions. However, in contrast to room temperatures, there is a significant difference in the spectral width and intensity of the lines compared to monolayers WSe$_2$, obtained regular way from the same source material. The differences found, demonstrating a significant increase in background doping and structural disorder when using gold-assisted exfoliation, may be meaningful for a number of optoelectronic applications of atomically thin WSe$_2$ films.