期刊
NANO LETTERS
卷 17, 期 5, 页码 3312-3319出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.7b01394
关键词
Vibrational wave packet; acoustic phonon; 2D semiconductor nanostructure; Auger hole trapping; femtosecond transient absorption spectroscopy
类别
资金
- NTU
- A*Star Science and Engineering Research Council [122-PSF-0011, 122 360 0008]
- Ministry of Education Academic Research Fund [MOE2014-T2-2-052]
- award of a Nanyang Assistant Professorship
Femtosecond optical pump-probe, spectroscopy resolves hitherto unobserved coherent acoustic phonons in colloidal CdSe/CdS core/shell nanoplatelets (NPLs). With increasing pump fluence, the frequency of the in-plane acoustic mode increases from 5.2 to 10.7 cm(-1), whereas the frequency of the out-of-plane mode remains at similar to 20 cm(-1). Analysis of the oscillation phases suggests that the coherent acoustic phonon generation mechanism transitions from displacive excitation to: subpicosecond Auger hole trapping with increasing pump fluence. The measurements yield Huang-Rhys parameters of similar to 10(-2) for both acoustic modes. The weak electron-phonon coupling strengths favor the application of NPLs in optoelectronics.
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