In:
Physical Chemistry Chemical Physics, Royal Society of Chemistry (RSC), Vol. 23, No. 36 ( 2021), p. 20666-20674
Abstract:
Recently, palladium diselenide (PdSe 2 ) has emerged as a promising material with potential applications in electronic and optoelectronic devices due to its intriguing electronic and optical properties. The performance of the device is strongly dependent on the charge–carrier dynamics and the related hot phonon behavior. Here, we investigate the photoexcited–carrier dynamics and coherent acoustic phonon (CAP) oscillations in mechanically exfoliated PdSe 2 flakes with a thickness ranging from 10.6 nm to 54 nm using time-resolved non-degenerate pump–probe transient reflection (TR) spectroscopy. The results imply that the CAP frequency is thickness-dependent. Polarization-resolved transient reflection (PRTR) measurements reveal the isotropic charge–carrier relaxation dynamics and the CAP frequency in the 10.6 nm region. In addition, the deformation potential (DP) mechanism dominates the generation of the CAP. Moreover, a sound velocity of 6.78 × 10 3 m s −1 is extracted from the variation of the oscillation period with the flake thickness and the delay time of the acoustic echo. These results provide insight into the ultrafast optical coherent acoustic phonon and optoelectronic properties of PdSe 2 and may open new possibilities for PdSe 2 applications in THz-frequency mechanical resonators.
Type of Medium:
Online Resource
ISSN:
1463-9076
,
1463-9084
Language:
English
Publisher:
Royal Society of Chemistry (RSC)
Publication Date:
2021
detail.hit.zdb_id:
1476283-3
detail.hit.zdb_id:
1476244-4
detail.hit.zdb_id:
1460656-2
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