Journal
AIP ADVANCES
Volume 7, Issue 7, Pages -Publisher
AIP Publishing
DOI: 10.1063/1.4994211
Keywords
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Funding
- University of Toledo start-up funds
- Ohio Department of Development (ODOD) Ohio Research Scholar Program (Northwest Ohio Innovators in Thin Film Photovoltaics) [TECH 09-025]
- U.S. Department of Energy (DOE) SunShot Initiative under the Next Generation Photovoltaics 3 program [DE-FOA-0000990]
- National Science Foundation [CHE-1230246, DMR-1534586]
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Mixed tin (Sn) and lead (Pb) based perovskite thin films have been prepared by solution processing combining methylammonium lead iodide (MAPbI(3)) and formamidinium tin iodide (FASnI(3)) precursors. Optical response in the form of complex dielectric function (epsilon = epsilon(1) + i epsilon(2)) spectra and absorption coefficient (alpha) spectra of (FASnI3)(1-x)(MAPbI(3))(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 (FASnI(3))(1-x)(MAPbI(3))(x) perovskites. (FASnI(3))(0.60)(MAPbI(3))(0.4) is found to have the minimum absorption band edge energy near similar to 1.2 eV. (C) 2017 Author(s).
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