Optical response of mixed methylammonium lead iodide and formamidinium tin iodide perovskite thin films | Zendy

Kiran Ghimire | Zendy; Dewei Zhao | Zendy; Yanfa Yan | Zendy; Nikolas J. Podraza | Zendy

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Optical response of mixed methylammonium lead iodide and formamidinium tin iodide perovskite thin films

Author(s) -

Kiran Ghimire,

Dewei Zhao,

Yanfa Yan,

Nikolas J. Podraza

Publication year - 2017

Publication title -

aip advances

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.421

H-Index - 58

ISSN - 2158-3226

DOI - 10.1063/1.4994211

Subject(s) - formamidinium , iodide , perovskite (structure) , tin , thin film , absorption edge , materials science , analytical chemistry (journal) , ellipsometry , absorption (acoustics) , chemistry , inorganic chemistry , band gap , crystallography , nanotechnology , optoelectronics , composite material , metallurgy , organic chemistry

Mixed tin (Sn) and lead (Pb) based perovskite thin films have been prepared by solution processing combining methylammonium lead iodide (MAPbI3) and formamidinium tin iodide (FASnI3) precursors. Optical response in the form of complex dielectric function (ε = ε1 + iε2) spectra and absorption coefficient (α) spectra of (FASnI3)1-x(MAPbI3)x based perovskite films have been extracted over a spectral range 0.74 to 5.89 eV using spectroscopic ellipsometry. Absorption band edge energy changes as a function of composition for films including FASnI3, MAPbI3, and mixed x = 0.20, 0.35, 0.40, and 0.6 (FASnI3)1-x(MAPbI3)x perovskites. (FASnI3)0.60(MAPbI3)0.4 is found to have the minimum absorption band edge energy near ∼1.2 eV

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