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

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

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...

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Bibliographic Details
Main Authors: Marcus, Ruldoph Arthur, Michel-Beyerle, Maria-Elisabeth, Lam, Yeng Ming, Chia, Elbert Ee Min, La-o-vorakiat, Chan, Cheng, Liang, Salim, Teddy
Other Authors: School of Materials Science & Engineering
Format: Article
Language:English
Published: 2017
Subjects:
Phonons
Photoconductivity
Online Access:https://hdl.handle.net/10356/83354
http://hdl.handle.net/10220/42564
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Institution: Nanyang Technological University
Language: English
Description
Summary: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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