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Highly sensitive terahertz thin-film total internal reflection spectroscopy reveals in situ photoinduced structural changes in methylammonium lead halide perovskites
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Sun, Qiushuo, Liu, Xudong, Cao, Jie, Stantchev, Rayko I., Zhou, Yang, Chen, Xuequan, Parrott, Edward P. J., Lloyd-Hughes, James, Zhao, Ni and Pickwell-MacPherson, Emma (2018) Highly sensitive terahertz thin-film total internal reflection spectroscopy reveals in situ photoinduced structural changes in methylammonium lead halide perovskites. The Journal of Physical Chemistry C, 122 (30). pp. 17552-17558. doi:10.1021/acs.jpcc.8b05695 ISSN 1932-7447.
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WRAP-highly-sensitive-terahertz thin-film-total-internal-reflection-spectroscopy-Pickwell-MacPherson-2018.pdf - Accepted Version - Requires a PDF viewer. Download (1561Kb) | Preview |
Official URL: http://dx.doi.org/10.1021/acs.jpcc.8b05695
Abstract
Terahertz (THz) thin-film total internal reflection (TF-TIR) spectroscopy is shown to have an enhanced sensitivity to the vibrational properties of thin films in comparison with standard THz transmission spectroscopy. This increased sensitivity was used to track photoinduced modifications to the structure of thin films of methylammonium (MA) lead halide, MAPbI3–xBrx (x = 0, 0.5, 1, and 3). Initially, illumination strengthened the phonon modes around 2 THz, associated with Pb–I stretch modes coupled to the MA ions, whereas the 1 THz twist modes of the inorganic octahedra did not alter in strength. Under longer term illumination, the 1 THz phonon modes of encapsulated films slowly reduced in strength, whereas in films exposed to moisture and oxygen, these phonons weaken more rapidly and blue-shift in frequency. The rapid monitoring of environmentally induced changes to the vibrational modes afforded by TF-TIR spectroscopy offers applications in the characterization and quality control of the perovskite thin-film solar cells and other thin-film semiconductors.
| Item Type: | Journal Article | ||||||
|---|---|---|---|---|---|---|---|
| Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||||
| Journal or Publication Title: | The Journal of Physical Chemistry C | ||||||
| Publisher: | American Chemical Society | ||||||
| ISSN: | 1932-7447 | ||||||
| Official Date: | 28 June 2018 | ||||||
| Dates: |
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| Volume: | 122 | ||||||
| Number: | 30 | ||||||
| Page Range: | pp. 17552-17558 | ||||||
| DOI: | 10.1021/acs.jpcc.8b05695 | ||||||
| Status: | Peer Reviewed | ||||||
| Publication Status: | Published | ||||||
| Reuse Statement (publisher, data, author rights): | This document is the Accepted Manuscript version of a Published Work that appeared in final form in The Journal of Physical Chemistry C, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see http://dx.doi.org/10.1021/acs.jpcc.8b05695 | ||||||
| Access rights to Published version: | Restricted or Subscription Access | ||||||
| Date of first compliant deposit: | 10 August 2018 | ||||||
| Date of first compliant Open Access: | 28 June 2019 |
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