Ultrafast charge generation and relaxation dynamics in methylammonium lead bromide perovskites

Xiaofan Deng; Xiaoming Wen; Rui Sheng; Shujuan Huang; Takaaki Harada; Tak W. Kee; Martin A. Green; Anita Ho-Baillie

doi:10.1117/12.2202330

Ultrafast charge generation and relaxation dynamics in methylammonium lead bromide perovskites

Xiaofan Deng, Xiaoming Wen, Rui Sheng, Shujuan Huang, Takaaki Harada, Tak W. Kee, Martin A. Green, Anita Ho-Baillie

Research output: Chapter in Book/Report/Conference proceeding › Conference proceeding contribution › peer-review

Abstract

Methylammonium Lead Bromide (CH₃NH₃PbBr₃) is a promising material for tandem solar cell due to its high band gap. Ultrafast optical techniques on a time scale of femto- and picosecond are used to investigate the carrier dynamics in CH₃NH₃PbBr₃. An ultrafast cooling of hot carriers occurs in sub-picoseconds in CH₃NH₃PbBr₃ by phonon scattering. Two ultrafast relaxation processes are attributed to optical phonon scattering and acoustic phonon scattering. The relaxation processes are evidently slower when CH₃NH₃PbBr₃ is in contact with compact TiO₂ (c-TiO₂) layer, suggesting better quality CH₃NH₃PbBr₃. when deposited on c-TiO₂. The nanosecond decay in CH₃NH₃PbBr₃ film is ascribed to electron-hole recombination. With the presence of c-TiO₂ layer, this process is accelerated due to electron transport across the CH₃NH₃PbBr₃/ c-TiO₂ interface.

Original language	English
Title of host publication	SPIE Micro+Nano Materials, Devices, and Systems
Editors	Benjamin J. Eggleton, Stefano Palomba
Place of Publication	Bellingham, WA
Publisher	SPIE
Pages	1-6
Number of pages	6
ISBN (Electronic)	9781628418903
DOIs	https://doi.org/10.1117/12.2202330
Publication status	Published - 2015
Externally published	Yes
Event	SPIE Micro+Nano Materials, Devices, and Applications Symposium - Sydney, Australia Duration: 6 Dec 2015 → 9 Dec 2015

Publication series

Name	Proceedings of SPIE
Publisher	SPIE
Volume	9668
ISSN (Print)	0277-786X
ISSN (Electronic)	1996-756X

Conference

Conference	SPIE Micro+Nano Materials, Devices, and Applications Symposium
Country/Territory	Australia
City	Sydney
Period	6/12/15 → 9/12/15

Keywords

ultrafast spectroscopy
perovskite solar cell
CH₃NH₃PbBr₃
photovoltaics
carrier dynamics

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10.1117/12.2202330

Cite this

Deng, X., Wen, X., Sheng, R., Huang, S., Harada, T., Kee, T. W., Green, M. A., & Ho-Baillie, A. (2015). Ultrafast charge generation and relaxation dynamics in methylammonium lead bromide perovskites. In B. J. Eggleton, & S. Palomba (Eds.), SPIE Micro+Nano Materials, Devices, and Systems (pp. 1-6). Article 966848 (Proceedings of SPIE; Vol. 9668). SPIE. https://doi.org/10.1117/12.2202330

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title = "Ultrafast charge generation and relaxation dynamics in methylammonium lead bromide perovskites",

abstract = "Methylammonium Lead Bromide (CH3NH3PbBr3) is a promising material for tandem solar cell due to its high band gap. Ultrafast optical techniques on a time scale of femto- and picosecond are used to investigate the carrier dynamics in CH3NH3PbBr3. An ultrafast cooling of hot carriers occurs in sub-picoseconds in CH3NH3PbBr3 by phonon scattering. Two ultrafast relaxation processes are attributed to optical phonon scattering and acoustic phonon scattering. The relaxation processes are evidently slower when CH3NH3PbBr3 is in contact with compact TiO2 (c-TiO2) layer, suggesting better quality CH3NH3PbBr3. when deposited on c-TiO2. The nanosecond decay in CH3NH3PbBr3 film is ascribed to electron-hole recombination. With the presence of c-TiO2 layer, this process is accelerated due to electron transport across the CH3NH3PbBr3/ c-TiO2 interface.",

keywords = "ultrafast spectroscopy, perovskite solar cell, CH₃NH₃PbBr₃, photovoltaics, carrier dynamics",

author = "Xiaofan Deng and Xiaoming Wen and Rui Sheng and Shujuan Huang and Takaaki Harada and Kee, {Tak W.} and Green, {Martin A.} and Anita Ho-Baillie",

year = "2015",

doi = "10.1117/12.2202330",

language = "English",

series = "Proceedings of SPIE",

publisher = "SPIE",

pages = "1--6",

editor = "Eggleton, {Benjamin J.} and Stefano Palomba",

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address = "United States",

note = "SPIE Micro+Nano Materials, Devices, and Applications Symposium ; Conference date: 06-12-2015 Through 09-12-2015",

}

Deng, X, Wen, X, Sheng, R, Huang, S, Harada, T, Kee, TW, Green, MA & Ho-Baillie, A 2015, Ultrafast charge generation and relaxation dynamics in methylammonium lead bromide perovskites. in BJ Eggleton & S Palomba (eds), SPIE Micro+Nano Materials, Devices, and Systems., 966848, Proceedings of SPIE, vol. 9668, SPIE, Bellingham, WA, pp. 1-6, SPIE Micro+Nano Materials, Devices, and Applications Symposium, Sydney, Australia, 6/12/15. https://doi.org/10.1117/12.2202330

Ultrafast charge generation and relaxation dynamics in methylammonium lead bromide perovskites. / Deng, Xiaofan; Wen, Xiaoming; Sheng, Rui et al.
SPIE Micro+Nano Materials, Devices, and Systems. ed. / Benjamin J. Eggleton; Stefano Palomba. Bellingham, WA: SPIE, 2015. p. 1-6 966848 (Proceedings of SPIE; Vol. 9668).

Research output: Chapter in Book/Report/Conference proceeding › Conference proceeding contribution › peer-review

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T1 - Ultrafast charge generation and relaxation dynamics in methylammonium lead bromide perovskites

AU - Deng, Xiaofan

AU - Wen, Xiaoming

AU - Sheng, Rui

AU - Huang, Shujuan

AU - Harada, Takaaki

AU - Kee, Tak W.

AU - Green, Martin A.

AU - Ho-Baillie, Anita

PY - 2015

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N2 - Methylammonium Lead Bromide (CH3NH3PbBr3) is a promising material for tandem solar cell due to its high band gap. Ultrafast optical techniques on a time scale of femto- and picosecond are used to investigate the carrier dynamics in CH3NH3PbBr3. An ultrafast cooling of hot carriers occurs in sub-picoseconds in CH3NH3PbBr3 by phonon scattering. Two ultrafast relaxation processes are attributed to optical phonon scattering and acoustic phonon scattering. The relaxation processes are evidently slower when CH3NH3PbBr3 is in contact with compact TiO2 (c-TiO2) layer, suggesting better quality CH3NH3PbBr3. when deposited on c-TiO2. The nanosecond decay in CH3NH3PbBr3 film is ascribed to electron-hole recombination. With the presence of c-TiO2 layer, this process is accelerated due to electron transport across the CH3NH3PbBr3/ c-TiO2 interface.

AB - Methylammonium Lead Bromide (CH3NH3PbBr3) is a promising material for tandem solar cell due to its high band gap. Ultrafast optical techniques on a time scale of femto- and picosecond are used to investigate the carrier dynamics in CH3NH3PbBr3. An ultrafast cooling of hot carriers occurs in sub-picoseconds in CH3NH3PbBr3 by phonon scattering. Two ultrafast relaxation processes are attributed to optical phonon scattering and acoustic phonon scattering. The relaxation processes are evidently slower when CH3NH3PbBr3 is in contact with compact TiO2 (c-TiO2) layer, suggesting better quality CH3NH3PbBr3. when deposited on c-TiO2. The nanosecond decay in CH3NH3PbBr3 film is ascribed to electron-hole recombination. With the presence of c-TiO2 layer, this process is accelerated due to electron transport across the CH3NH3PbBr3/ c-TiO2 interface.

KW - ultrafast spectroscopy

KW - perovskite solar cell

KW - CH₃NH₃PbBr₃

KW - photovoltaics

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BT - SPIE Micro+Nano Materials, Devices, and Systems

A2 - Eggleton, Benjamin J.

A2 - Palomba, Stefano

PB - SPIE

CY - Bellingham, WA

T2 - SPIE Micro+Nano Materials, Devices, and Applications Symposium

Y2 - 6 December 2015 through 9 December 2015

ER -

Ultrafast charge generation and relaxation dynamics in methylammonium lead bromide perovskites

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Keywords

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