Difference in hot carrier cooling rate between Langmuir-Blodgett and drop cast PbS QD films due to strong electron-phonon coupling

Nanoscale
Wenkai CaoShujuan Huang

Abstract

The carrier dynamics of lead sulphide quantum dot (PbS QD) drop cast films and closely packed ordered Langmuir-Blodgett films are studied with ultra-fast femtosecond transient absorption spectroscopy. The photo-induced carrier temperature is extracted from transient absorption spectra and monitored as a function of time delay. The cooling dynamics of carriers in PbS QDs suggest a reduction of the carrier energy loss rate at longer time delays through the retardation of the longitudinal optical (LO) phonon decay due to partial heating of acoustic phonon modes. A slowed hot carrier cooling time up to 116 ps is observed in the drop cast film. A faster cooling rate was also observed in the highly compact Langmuir-Blodgett film due to the enhanced carrier-LO phonon coupling strength arising from the Coulombic interaction in neighboring QDs, which is verified by temperature dependent steady state PL measurements.

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Citations

Aug 15, 2019·Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry·So-Yeon ParkHyun Suk Jung
May 25, 2021·The Journal of Physical Chemistry Letters·Augustin CaillasAloyse Degiron
Sep 23, 2020·The Journal of Physical Chemistry Letters·Gurpreet Kaur, Hirendra N Ghosh

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Methods Mentioned

BETA
transmission electron microscopy

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