Carrier Diffusion Lengths of over 500 nm in Lead-Free Perovskite CH3NH3SnI3 Films

Lin Ma; Feng Hao; Constantinos C. Stoumpos; Brian T. Phelan; Michael R. Wasielewski; Mercouri G. Kanatzidis

doi:10.1021/jacs.6b09257

Carrier Diffusion Lengths of over 500 nm in Lead-Free Perovskite CH₃NH₃SnI₃ Films

Lin Ma, Feng Hao, Constantinos C. Stoumpos, Brian T. Phelan, Michael R. Wasielewski^*, Mercouri G. Kanatzidis

^*Corresponding author for this work

Chemistry

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

143 Scopus citations

Abstract

The dynamics of photoexcited lead-free perovskite films, CH₃NH₃SnI₃, were studied using broadband transient absorption and time-resolved fluorescence spectroscopy. Similar to its lead analogue CH₃NH₃PbI₃, we show that free carrier (electrons and holes) recombination is also the dominant relaxation pathway in CH₃NH₃SnI₃ films. The slow hot carrier relaxation time is 0.5 ps. Long carrier diffusion lengths for electrons (279 ± 88 nm) and holes (193 ± 46 nm) were obtained from fluorescence quenching measurements. We also show that SnF₂ doping in the CH₃NH₃SnI₃ film effectively increases the fluorescence lifetime up to 10 times and gives diffusion lengths exceeding 500 nm. These results suggest that the photophysics of CH₃NH₃SnI₃ perovskite are as favorable as those of CH₃NH₃PbI₃, demonstrating that it is a promising nontoxic lead-free replacement for lead iodide perovskite-based solar cells.

Original language	English (US)
Pages (from-to)	14750-14755
Number of pages	6
Journal	Journal of the American Chemical Society
Volume	138
Issue number	44
DOIs	https://doi.org/10.1021/jacs.6b09257
State	Published - Nov 9 2016

ASJC Scopus subject areas

Catalysis
Chemistry(all)
Biochemistry
Colloid and Surface Chemistry

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title = "Carrier Diffusion Lengths of over 500 nm in Lead-Free Perovskite CH3NH3SnI3 Films",

abstract = "The dynamics of photoexcited lead-free perovskite films, CH3NH3SnI3, were studied using broadband transient absorption and time-resolved fluorescence spectroscopy. Similar to its lead analogue CH3NH3PbI3, we show that free carrier (electrons and holes) recombination is also the dominant relaxation pathway in CH3NH3SnI3 films. The slow hot carrier relaxation time is 0.5 ps. Long carrier diffusion lengths for electrons (279 ± 88 nm) and holes (193 ± 46 nm) were obtained from fluorescence quenching measurements. We also show that SnF2 doping in the CH3NH3SnI3 film effectively increases the fluorescence lifetime up to 10 times and gives diffusion lengths exceeding 500 nm. These results suggest that the photophysics of CH3NH3SnI3 perovskite are as favorable as those of CH3NH3PbI3, demonstrating that it is a promising nontoxic lead-free replacement for lead iodide perovskite-based solar cells.",

author = "Lin Ma and Feng Hao and Stoumpos, {Constantinos C.} and Phelan, {Brian T.} and Wasielewski, {Michael R.} and Kanatzidis, {Mercouri G.}",

note = "Funding Information: This research was supported as part of the ANSER Center, an Energy Frontier Research Center funded by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences (award no. DE-SC0001059), and ISEN at Northwestern University. Publisher Copyright: {\textcopyright} 2016 American Chemical Society.",

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AU - Ma, Lin

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AU - Stoumpos, Constantinos C.

AU - Phelan, Brian T.

AU - Wasielewski, Michael R.

AU - Kanatzidis, Mercouri G.

N1 - Funding Information: This research was supported as part of the ANSER Center, an Energy Frontier Research Center funded by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences (award no. DE-SC0001059), and ISEN at Northwestern University. Publisher Copyright: © 2016 American Chemical Society.

PY - 2016/11/9

Y1 - 2016/11/9

N2 - The dynamics of photoexcited lead-free perovskite films, CH3NH3SnI3, were studied using broadband transient absorption and time-resolved fluorescence spectroscopy. Similar to its lead analogue CH3NH3PbI3, we show that free carrier (electrons and holes) recombination is also the dominant relaxation pathway in CH3NH3SnI3 films. The slow hot carrier relaxation time is 0.5 ps. Long carrier diffusion lengths for electrons (279 ± 88 nm) and holes (193 ± 46 nm) were obtained from fluorescence quenching measurements. We also show that SnF2 doping in the CH3NH3SnI3 film effectively increases the fluorescence lifetime up to 10 times and gives diffusion lengths exceeding 500 nm. These results suggest that the photophysics of CH3NH3SnI3 perovskite are as favorable as those of CH3NH3PbI3, demonstrating that it is a promising nontoxic lead-free replacement for lead iodide perovskite-based solar cells.

AB - The dynamics of photoexcited lead-free perovskite films, CH3NH3SnI3, were studied using broadband transient absorption and time-resolved fluorescence spectroscopy. Similar to its lead analogue CH3NH3PbI3, we show that free carrier (electrons and holes) recombination is also the dominant relaxation pathway in CH3NH3SnI3 films. The slow hot carrier relaxation time is 0.5 ps. Long carrier diffusion lengths for electrons (279 ± 88 nm) and holes (193 ± 46 nm) were obtained from fluorescence quenching measurements. We also show that SnF2 doping in the CH3NH3SnI3 film effectively increases the fluorescence lifetime up to 10 times and gives diffusion lengths exceeding 500 nm. These results suggest that the photophysics of CH3NH3SnI3 perovskite are as favorable as those of CH3NH3PbI3, demonstrating that it is a promising nontoxic lead-free replacement for lead iodide perovskite-based solar cells.

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Carrier Diffusion Lengths of over 500 nm in Lead-Free Perovskite CH₃NH₃SnI₃ Films

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