Beilstein J. Nanotechnol.2020,11, 1631–1643, doi:10.3762/bjnano.11.146
are characteristic of various types of atomic vibrations in a solid. The ordinate of the point contact-spectrum characterizes the phononconcentration in a certain section of the spectrum and reflects the amplitude of the density function of the phonon states.
The operation of point-contact sensors is
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Figure 1:
(a) Spectrum of the electron–phonon interaction in indium obtained using Yanson point contacts. V2 ...
Beilstein J. Nanotechnol.2020,11, 782–797, doi:10.3762/bjnano.11.63
. From this analysis, phonon lifetime in the Raman active modes and phononconcentration, as correlated to the energy parameter E0, were calculated as a function of the laser power, P, and substrate temperature, T. For monolayer WSe2, from the power dependence it was determined that the phonon lifetime
1.90× that of the out-of-plane vibrational mode over T = 79 K up to 523 K. To provide energy from external stimuli, as T and P were increased, peak broadening in the PL spectra of the A-exciton was observed. From this, a phononconcentration was tabulated using the Urbach formulism, which increased
electronic, optoelectronic and thermoelectric devices in the future.
Keywords: phononconcentration; phonon lifetime; Raman spectroscopy; thermal coefficients; Tungsten diselenide; two-dimensional material; Introduction
Since the discovery of graphene, atomically thin two-dimensional layered materials have
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Figure 1:
(a) Optical image of monolayer (1L), multilayer (ML), and bulk WSe2 nanomembranes. Raman and PL mea...