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High-energy optical transitions and optical constants of CH3NH3PbI3 measured by spectroscopic ellipsometry and spectrophotometry

High-energy optical transitions and optical constants of CH3NH3PbI3 measured by spectroscopic ellipsometry and spectrophotometry
High-energy optical transitions and optical constants of CH3NH3PbI3 measured by spectroscopic ellipsometry and spectrophotometry
Optoelectronics based on metal halide perovskites (MHPs) have shown substantial promise, following more than a decade of research. For prime routes of commercialization such as tandem solar cells, optical modeling which requires accurate optical data for the materials utilized is essential for engineering device architectures. Additionally, a comprehensive understanding of the fundamental material properties is vital for simulating the operation of devices for design purposes. In this article, we use variable angle spectroscopic ellipsometry (SE) to determine the optical constants of CH3NH3PbI3 (MAPbI3) thin films over a photon energy range of 0.73–6.45 eV. We successfully model the ellipsometric data using six Tauc–Lorentz oscillators for three different incident angles. Following this, we use critical-point analysis of the complex dielectric constant to identify the well-known transitions at 1.59, 2.49, and 3.31 eV but also additional transitions at 4.39 and 5.65 eV, which are observed in both SE and spectrophotometry measurements. This work provides important information relating to optical transitions and the band structure of MAPbI3, which can assist in the development of potential applications of the material.
1932-7447
28795-28801
Bailey, Christopher
c537fe2c-47b1-45cc-b449-92a7febdbd8d
Piana, Giacomo
3154f35e-0273-453f-b3b9-97b19d8d856e
Lagoudakis, Pavlos
ea50c228-f006-4edf-8459-60015d961bbf
Bailey, Christopher
c537fe2c-47b1-45cc-b449-92a7febdbd8d
Piana, Giacomo
3154f35e-0273-453f-b3b9-97b19d8d856e
Lagoudakis, Pavlos
ea50c228-f006-4edf-8459-60015d961bbf

Bailey, Christopher, Piana, Giacomo and Lagoudakis, Pavlos (2019) High-energy optical transitions and optical constants of CH3NH3PbI3 measured by spectroscopic ellipsometry and spectrophotometry. The Journal of Physical Chemistry C, 123 (47), 28795-28801. (doi:10.1021/acs.jpcc.9b08903).

Record type: Article

Abstract

Optoelectronics based on metal halide perovskites (MHPs) have shown substantial promise, following more than a decade of research. For prime routes of commercialization such as tandem solar cells, optical modeling which requires accurate optical data for the materials utilized is essential for engineering device architectures. Additionally, a comprehensive understanding of the fundamental material properties is vital for simulating the operation of devices for design purposes. In this article, we use variable angle spectroscopic ellipsometry (SE) to determine the optical constants of CH3NH3PbI3 (MAPbI3) thin films over a photon energy range of 0.73–6.45 eV. We successfully model the ellipsometric data using six Tauc–Lorentz oscillators for three different incident angles. Following this, we use critical-point analysis of the complex dielectric constant to identify the well-known transitions at 1.59, 2.49, and 3.31 eV but also additional transitions at 4.39 and 5.65 eV, which are observed in both SE and spectrophotometry measurements. This work provides important information relating to optical transitions and the band structure of MAPbI3, which can assist in the development of potential applications of the material.

Text
High-Energy Optical Transitions and Optical Constants of CH3NH3PbI3 Measured by Spectroscopic Ellipsometry and Spectrophotometry - Accepted Manuscript
Restricted to Repository staff only until 6 November 2020.
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More information

Accepted/In Press date: 16 October 2019
e-pub ahead of print date: 6 November 2019
Published date: 27 November 2019
Additional Information: arxiv is am

Identifiers

Local EPrints ID: 437007
URI: http://eprints.soton.ac.uk/id/eprint/437007
ISSN: 1932-7447
PURE UUID: 654d0702-27c9-4810-b5e9-ddc1b72a36fc

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Date deposited: 15 Jan 2020 17:30
Last modified: 06 Oct 2020 22:41

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