Optical constants of CH3NH3PbBr3 perovskite thin films measured by spectroscopic ellipsometry

Abstract
The lack of optical constants information for hybrid perovskite of CH3NH3PbBr3 in thin films form can delay the progress of efficient LED or laser demonstration. Here, we report on the optical constants (complex refractive index and dielectric function) of CH3NH3PbBr3 perovskite thin films using spectroscopic ellipsometry. Due to the existence of voids, the refractive index of the thin films is around 8% less than the single crystals counterpart. The energy bandgap is around 2.309 eV as obtained from photoluminescence and spectrophotometry spectra, and calculated from the SE analysis. The precise measurement of optical constants will be useful in designing optical devices using CH3NH3PbBr3 thin films.

Citation
Mohd Sharizal Alias, Ibrahim Dursun, Makhsud I. Saidaminov, Elhadj Marwane Diallo, Pawan Mishra, Tien Khee Ng, Osman M. Bakr, and Boon S. Ooi, "Optical constants of CH3NH3PbBr3 perovskite thin films measured by spectroscopic ellipsometry," Opt. Express 24, 16586-16594 (2016)

Acknowledgements
King Abdulaziz City for Science and Technology (KACST) (KACST TIC R2-FP-008); King Abdullah University of Science and Technology (KAUST) (BAS/1/1614-01-01).

Publisher
The Optical Society

Journal
Optics Express

DOI
10.1364/OE.24.016586

Additional Links
https://www.osapublishing.org/abstract.cfm?URI=oe-24-15-16586

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