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Effect of Intermediate Phases on Optical Properties of PbI2-rich CH3NH3PbI3 Organic−Inorganic Hybrid Perovskite

Abstract

Methylammonium lead halide perovskite (CH3NH3PbI3) films, with high PbI2 concentration, were grown by the two-step spin coating method. The influence of the precursor concentration and annealing time on optical and structural properties of the perovskite films were analyzed by Optical Absorption, Photoluminescence, X-ray diffraction and Scanning Electron Microscopy. Results showed that, in addition to the CH3NH3PbI3 and PbI2 phases, intermediate phases, such as (MA)2(DMF)2Pb3I8, were formed in the films, depending on the time and temperature of the annealing, which can tune the optical absorption in the visible spectra. This intermediate phase induced the formation of perovskite nanowires, identified by SEM images, and their growth may be associated with the presence of the DMF solvent remaining in the PbI2 film.

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Publication details

The article was received on 07 Nov 2018, accepted on 07 Feb 2019 and first published on 11 Feb 2019


Article type: Paper
DOI: 10.1039/C8CP06916F
Citation: Phys. Chem. Chem. Phys., 2019, Accepted Manuscript

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    Effect of Intermediate Phases on Optical Properties of PbI2-rich CH3NH3PbI3 Organic−Inorganic Hybrid Perovskite

    A. W. Sanches, M. A. T. Silva, N. J. A. Cordeiro, A. Urbano and S. A. Lourenço, Phys. Chem. Chem. Phys., 2019, Accepted Manuscript , DOI: 10.1039/C8CP06916F

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