Phonon features in terahertz photoconductivity spectra due to data analysis artifact: A case study on organometallic halide perovskites

Chan La-O-Vorakiat; Liang Cheng; Teddy Salim; Rudolph A. Marcus; Maria Elisabeth Michel-Beyerle; Yeng Ming Lam; Elbert E.M. Chia

doi:10.1063/1.4978688

Phonon features in terahertz photoconductivity spectra due to data analysis artifact: A case study on organometallic halide perovskites

Chan La-O-Vorakiat^*, Liang Cheng, Teddy Salim, Rudolph A. Marcus, Maria Elisabeth Michel-Beyerle, Yeng Ming Lam, Elbert E.M. Chia

^*Corresponding author for this work

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

25 Citations (Scopus)

Abstract

We propose a simple scenario where the superimposed phonon modes on the photoconductive spectra are experimental artifacts due to the invalid formula used in data analysis. By use of experimental and simulated data of CH₃NH₃PbI₃ perovskites as a case study, we demonstrate that a correction term must be included in the approximated thin-film formula used in the literature; otherwise, parts of the spectra with high background permittivity near the phonon-mode resonances might interfere with the transient photoconductivity. The implication of this work is not limited to perovskites but other materials with strong vibrational modes within the THz spectral range.

Original language	English
Article number	123901
Journal	Applied Physics Letters
Volume	110
Issue number	12
DOIs	https://doi.org/10.1063/1.4978688
Publication status	Published - Mar 20 2017
Externally published	Yes

Bibliographical note

Publisher Copyright:
© 2017 Author(s).

ASJC Scopus Subject Areas

Physics and Astronomy (miscellaneous)

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abstract = "We propose a simple scenario where the superimposed phonon modes on the photoconductive spectra are experimental artifacts due to the invalid formula used in data analysis. By use of experimental and simulated data of CH3NH3PbI3 perovskites as a case study, we demonstrate that a correction term must be included in the approximated thin-film formula used in the literature; otherwise, parts of the spectra with high background permittivity near the phonon-mode resonances might interfere with the transient photoconductivity. The implication of this work is not limited to perovskites but other materials with strong vibrational modes within the THz spectral range.",

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AU - La-O-Vorakiat, Chan

AU - Cheng, Liang

AU - Salim, Teddy

AU - Marcus, Rudolph A.

AU - Michel-Beyerle, Maria Elisabeth

AU - Lam, Yeng Ming

AU - Chia, Elbert E.M.

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AB - We propose a simple scenario where the superimposed phonon modes on the photoconductive spectra are experimental artifacts due to the invalid formula used in data analysis. By use of experimental and simulated data of CH3NH3PbI3 perovskites as a case study, we demonstrate that a correction term must be included in the approximated thin-film formula used in the literature; otherwise, parts of the spectra with high background permittivity near the phonon-mode resonances might interfere with the transient photoconductivity. The implication of this work is not limited to perovskites but other materials with strong vibrational modes within the THz spectral range.

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Phonon features in terahertz photoconductivity spectra due to data analysis artifact: A case study on organometallic halide perovskites

Abstract

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