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Published March 20, 2017 | Published + Supplemental Material
Journal Article Open

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

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 CH_3NH_3PbI_3 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.

Additional Information

© 2017 AIP Publishing. Received 27 December 2016; accepted 1 March 2017; published online 20 March 2017. This research was supported by the Theoretical and Computational Science (TaCS) Center under Computational and Applied Science for Smart Innovation Cluster (CLASSIC), Faculty of Science, KMUTT, Singapore Ministry of Education AcRF Tier 2 (MOE2015-T2-2-065), AcRF Tier 1 (RG123/14 & RF99/14) and the A*STAR Pharos Programmes (Grant No. 1527400026 & 1527000016).

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Supplemental Material - .listing

Supplemental Material - supplementaryv3.pdf

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