Carrier recombination mechanism in CsPbB r3 revealed by time-resolved photoluminescence spectroscopy

J. A. Peters; Zhifu Liu; Ruihan Yu; K. M. McCall; Yihui He; M. G. Kanatzidis; B. W. Wessels

doi:10.1103/PhysRevB.100.235305

Carrier recombination mechanism in CsPbB r3 revealed by time-resolved photoluminescence spectroscopy

J. A. Peters, Zhifu Liu, Ruihan Yu, K. M. McCall, Yihui He, M. G. Kanatzidis, B. W. Wessels^*

^*Corresponding author for this work

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

14 Scopus citations

Abstract

We systematically investigate the recombination mechanism of photogenerated charge carriers in bulk CsPbBr3 by means of time-resolved photoluminescence (TR-PL) spectroscopy at low temperature and various laser excitation powers. A dynamic recombination model is proposed to describe the TR-PL that predicts the time-dependent exciton and free-charge populations. It provides a clear representation of competing mono- A nd bimolecular recombination processes. A decrease in carrier lifetime with increasing laser intensity was observed that was attributed to exciton-exciton scattering. A bimolecular recombination coefficient of ∼10-7cm3/s was obtained for exciton recombination. As the concentration of photoexcited carriers increases, stronger exciton-exciton annihilation occurs. The exciton-exciton annihilation rate for CsPbBr3 is 3.63×10-7cm3s-1 at 10-mW laser power. Notably, the exciton-exciton annihilation rate in bulk material is comparable to that obtained for photoexcited CsPbBr3 nanoscale quantum dots.

Original language	English (US)
Article number	235305
Journal	Physical Review B
Volume	100
Issue number	23
DOIs	https://doi.org/10.1103/PhysRevB.100.235305
State	Published - Dec 12 2019

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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@article{0a06d2e1d27145d58ff67373ce499842,

title = "Carrier recombination mechanism in CsPbB r3 revealed by time-resolved photoluminescence spectroscopy",

abstract = "We systematically investigate the recombination mechanism of photogenerated charge carriers in bulk CsPbBr3 by means of time-resolved photoluminescence (TR-PL) spectroscopy at low temperature and various laser excitation powers. A dynamic recombination model is proposed to describe the TR-PL that predicts the time-dependent exciton and free-charge populations. It provides a clear representation of competing mono- A nd bimolecular recombination processes. A decrease in carrier lifetime with increasing laser intensity was observed that was attributed to exciton-exciton scattering. A bimolecular recombination coefficient of ∼10-7cm3/s was obtained for exciton recombination. As the concentration of photoexcited carriers increases, stronger exciton-exciton annihilation occurs. The exciton-exciton annihilation rate for CsPbBr3 is 3.63×10-7cm3s-1 at 10-mW laser power. Notably, the exciton-exciton annihilation rate in bulk material is comparable to that obtained for photoexcited CsPbBr3 nanoscale quantum dots.",

author = "Peters, {J. A.} and Zhifu Liu and Ruihan Yu and McCall, {K. M.} and Yihui He and Kanatzidis, {M. G.} and Wessels, {B. W.}",

note = "Funding Information: This work was supported by the Department of Homeland Security ARI program with Grant No. 2014-DN-077-ARI086-01. This work made use of the Materials Processing and Microfabrication Facility supported by the MRSEC program of the National Science Foundation (Grant No. DMR-1720139) at the Materials Research Center of Northwestern University. Publisher Copyright: {\textcopyright} 2019 American Physical Society.",

year = "2019",

month = dec,

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doi = "10.1103/PhysRevB.100.235305",

language = "English (US)",

volume = "100",

journal = "Physical Review B",

issn = "2469-9950",

publisher = "American Institute of Physics",

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T1 - Carrier recombination mechanism in CsPbB r3 revealed by time-resolved photoluminescence spectroscopy

AU - Peters, J. A.

AU - Liu, Zhifu

AU - Yu, Ruihan

AU - McCall, K. M.

AU - He, Yihui

AU - Kanatzidis, M. G.

AU - Wessels, B. W.

N1 - Funding Information: This work was supported by the Department of Homeland Security ARI program with Grant No. 2014-DN-077-ARI086-01. This work made use of the Materials Processing and Microfabrication Facility supported by the MRSEC program of the National Science Foundation (Grant No. DMR-1720139) at the Materials Research Center of Northwestern University. Publisher Copyright: © 2019 American Physical Society.

PY - 2019/12/12

Y1 - 2019/12/12

N2 - We systematically investigate the recombination mechanism of photogenerated charge carriers in bulk CsPbBr3 by means of time-resolved photoluminescence (TR-PL) spectroscopy at low temperature and various laser excitation powers. A dynamic recombination model is proposed to describe the TR-PL that predicts the time-dependent exciton and free-charge populations. It provides a clear representation of competing mono- A nd bimolecular recombination processes. A decrease in carrier lifetime with increasing laser intensity was observed that was attributed to exciton-exciton scattering. A bimolecular recombination coefficient of ∼10-7cm3/s was obtained for exciton recombination. As the concentration of photoexcited carriers increases, stronger exciton-exciton annihilation occurs. The exciton-exciton annihilation rate for CsPbBr3 is 3.63×10-7cm3s-1 at 10-mW laser power. Notably, the exciton-exciton annihilation rate in bulk material is comparable to that obtained for photoexcited CsPbBr3 nanoscale quantum dots.

AB - We systematically investigate the recombination mechanism of photogenerated charge carriers in bulk CsPbBr3 by means of time-resolved photoluminescence (TR-PL) spectroscopy at low temperature and various laser excitation powers. A dynamic recombination model is proposed to describe the TR-PL that predicts the time-dependent exciton and free-charge populations. It provides a clear representation of competing mono- A nd bimolecular recombination processes. A decrease in carrier lifetime with increasing laser intensity was observed that was attributed to exciton-exciton scattering. A bimolecular recombination coefficient of ∼10-7cm3/s was obtained for exciton recombination. As the concentration of photoexcited carriers increases, stronger exciton-exciton annihilation occurs. The exciton-exciton annihilation rate for CsPbBr3 is 3.63×10-7cm3s-1 at 10-mW laser power. Notably, the exciton-exciton annihilation rate in bulk material is comparable to that obtained for photoexcited CsPbBr3 nanoscale quantum dots.

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Carrier recombination mechanism in CsPbB r3 revealed by time-resolved photoluminescence spectroscopy

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