Direct Observation of Surface Polarons in Capped CuInS2 Quantum Dots by Ultrafast Pump–Probe Spectroscopies
Posted on 2019-08-27 - 19:37
Semiconductor
nanocrystals are mostly prepared by colloid chemistry
with organic surfactant molecules, and their surface polarization
effect on the carrier relaxations are critical to their optoelectronic
applications. Until now, the surface polarization effect and detailed
photophysical processes of these capped quantum dots (QDs) are still
unclear. Here, we studied the dynamics of the photoinduced carriers
and capping molecule vibrations of capped CuInS2 quantum dots by using the femtosecond pump–probe system in
both visible and IR zones. It is identified that the capping molecular
vibrations exhibit significant Fermion bleaching nature, whose relaxation
profile is in good agreement with the radiative recombination dynamics
of QDs in the visible region. These results demonstrate that the extrinsic
surface polarons form by the coupling of photoinduced carriers and
surface ligand vibrations, and take part in the photophysical processes
of these QDs. This finding is helpful for the QD design and applications
in photoelectronic devices.
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Guo, Yongchang; Yang, Fan; Zheng, Xuan; Tang, Jialun; Zhong, Haizheng; Yu, Anchi; et al. (2019). Direct Observation of Surface Polarons in Capped CuInS2 Quantum Dots by Ultrafast Pump–Probe Spectroscopies. ACS Publications. Collection. https://doi.org/10.1021/acs.jpclett.9b02023
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AUTHORS (8)
YG
Yongchang Guo
FY
Fan Yang
XZ
Xuan Zheng
JT
Jialun Tang
HZ
Haizheng Zhong
AY
Anchi Yu
JW
Jianping Wang
BZ
Bingsuo Zou