Efficient intraband hot carrier relaxation in Sn and Pb perovskite semiconductors mediated by strong electron-phonon coupling

M. Monti, J.M. Woolley, M. Staniforth, A. Wijesekara, S.X. Tao, R.M.I. Bandara, I. Jayawardena, A. Crocker, E. Griffin, S.R.P. Silva, R.A. Hatton, J. Lloyd-Hughes

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Samenvatting

The dynamic increase in terahertz photoconductivity resulting from energetic intraband relaxation was used to track the formation of highly mobile charges in thin films of the tin iodide perovskite Cs 1-x Rb x SnI 3 and compared to the lead based Cs 0:05 (FA 0:83 MA 0:17 ) 0:95 Pb(I 0:83 Br 0:17 ) 3 . Energy relaxation times were found to be around 500 fs, comparable to those in GaAs and longer than the ones of the lead-based perovskite (around 300 fs). At low excess energies the efficient intraband relaxation can be understood within the context of the Frohlich electron-phonon interaction. For higher excess energies the photoconductivity rise time lengthens in accordance with carrier injection higher in the bands, or into multiple bands. The findings contribute to the development of design rules for photovoltaic devices capable of extracting hot carriers from perovskite semiconductors.

Originele taal-2Engels
TitelUltrafast Phenomena and Nanophotonics XXIII
RedacteurenMarkus Betz, Abdulhakem Y. Elezzabi
UitgeverijSPIE
Aantal pagina's8
ISBN van elektronische versie9781510624740
DOI's
StatusGepubliceerd - 27 feb 2019
EvenementUltrafast Phenomena and Nanophotonics XXIII 2019 - San Francisco, Verenigde Staten van Amerika
Duur: 3 feb 20196 feb 2019

Publicatie series

NaamProceedings of SPIE
Volume10916

Congres

CongresUltrafast Phenomena and Nanophotonics XXIII 2019
LandVerenigde Staten van Amerika
StadSan Francisco
Periode3/02/196/02/19

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Monti, M., Woolley, J. M., Staniforth, M., Wijesekara, A., Tao, S. X., Bandara, R. M. I., ... Lloyd-Hughes, J. (2019). Efficient intraband hot carrier relaxation in Sn and Pb perovskite semiconductors mediated by strong electron-phonon coupling. In M. Betz, & A. Y. Elezzabi (editors), Ultrafast Phenomena and Nanophotonics XXIII [109160M] (Proceedings of SPIE; Vol. 10916). SPIE. https://doi.org/10.1117/12.2507268