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

Wenkai Cao; Lin Yuan; Rob Patterson; Xiaoming Wen; Patrick C. Tapping; Tak Kee; Binesh Puthen Veetil; Pengfei Zhang; Zewen Zhang; Qiuyang Zhang; Peter Reece; Stephen Bremner; Santosh Shrestha; Gavin Conibeer; Shujuan Huang

doi:10.1039/c7nr05247b

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

Wenkai Cao, Lin Yuan, Rob Patterson, Xiaoming Wen, Patrick C. Tapping, Tak Kee, Binesh Puthen Veetil, Pengfei Zhang, Zewen Zhang, Qiuyang Zhang, Peter Reece, Stephen Bremner, Santosh Shrestha, Gavin Conibeer, Shujuan Huang^*

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

6 Citations (Scopus)

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.

Original language	English
Pages (from-to)	17133-17142
Number of pages	10
Journal	Nanoscale
Volume	9
Issue number	43
DOIs	https://doi.org/10.1039/c7nr05247b
Publication status	Published - 21 Nov 2017
Externally published	Yes

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Cao, W., Yuan, L., Patterson, R., Wen, X., Tapping, P. C., Kee, T., Veetil, B. P., Zhang, P., Zhang, Z., Zhang, Q., Reece, P., Bremner, S., Shrestha, S., Conibeer, G., & Huang, S. (2017). Difference in hot carrier cooling rate between Langmuir-Blodgett and drop cast PbS QD films due to strong electron-phonon coupling. Nanoscale, 9(43), 17133-17142. https://doi.org/10.1039/c7nr05247b

Cao, Wenkai ; Yuan, Lin ; Patterson, Rob ; Wen, Xiaoming ; Tapping, Patrick C. ; Kee, Tak ; Veetil, Binesh Puthen ; Zhang, Pengfei ; Zhang, Zewen ; Zhang, Qiuyang ; Reece, Peter ; Bremner, Stephen ; Shrestha, Santosh ; Conibeer, Gavin ; Huang, Shujuan. / Difference in hot carrier cooling rate between Langmuir-Blodgett and drop cast PbS QD films due to strong electron-phonon coupling. In: Nanoscale. 2017 ; Vol. 9, No. 43. pp. 17133-17142.

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

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.",

author = "Wenkai Cao and Lin Yuan and Rob Patterson and Xiaoming Wen and Tapping, {Patrick C.} and Tak Kee and Veetil, {Binesh Puthen} and Pengfei Zhang and Zewen Zhang and Qiuyang Zhang and Peter Reece and Stephen Bremner and Santosh Shrestha and Gavin Conibeer and Shujuan Huang",

year = "2017",

month = nov,

day = "21",

doi = "10.1039/c7nr05247b",

language = "English",

volume = "9",

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Cao, W, Yuan, L, Patterson, R, Wen, X, Tapping, PC, Kee, T, Veetil, BP, Zhang, P, Zhang, Z, Zhang, Q, Reece, P, Bremner, S, Shrestha, S, Conibeer, G & Huang, S 2017, 'Difference in hot carrier cooling rate between Langmuir-Blodgett and drop cast PbS QD films due to strong electron-phonon coupling', Nanoscale, vol. 9, no. 43, pp. 17133-17142. https://doi.org/10.1039/c7nr05247b

Difference in hot carrier cooling rate between Langmuir-Blodgett and drop cast PbS QD films due to strong electron-phonon coupling. / Cao, Wenkai; Yuan, Lin; Patterson, Rob; Wen, Xiaoming; Tapping, Patrick C.; Kee, Tak; Veetil, Binesh Puthen; Zhang, Pengfei; Zhang, Zewen; Zhang, Qiuyang; Reece, Peter; Bremner, Stephen; Shrestha, Santosh; Conibeer, Gavin; Huang, Shujuan.

In: Nanoscale, Vol. 9, No. 43, 21.11.2017, p. 17133-17142.

Research output: Contribution to journal › Article › peer-review

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AU - Kee, Tak

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AU - Zhang, Pengfei

AU - Zhang, Zewen

AU - Zhang, Qiuyang

AU - Reece, Peter

AU - Bremner, Stephen

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AU - Conibeer, Gavin

AU - Huang, Shujuan

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AB - 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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