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Investigation on the properties of hybrid CH3NH3SnxI3 (0.9 ≤ x ≤ 1.4) perovskite systems

Published online by Cambridge University Press:  07 November 2017

Lucangelo Dimesso ,
Maximilian Stöhr ,
Chittaranjan Das ,
Thomas Mayer  and
Wolfram Jaegermann
Lucangelo Dimesso*
Affiliation:
Materials Science Department, Technische Universitaet Darmstadt, Darmstadt D-64287, Germany
Maximilian Stöhr
Affiliation:
Materials Science Department, Technische Universitaet Darmstadt, Darmstadt D-64287, Germany
Chittaranjan Das
Affiliation:
Materials Science Department, Technische Universitaet Darmstadt, Darmstadt D-64287, Germany
Thomas Mayer
Affiliation:
Materials Science Department, Technische Universitaet Darmstadt, Darmstadt D-64287, Germany
Wolfram Jaegermann
Affiliation:
Materials Science Department, Technische Universitaet Darmstadt, Darmstadt D-64287, Germany
*
a)Address all correspondence to this author. e-mail: ldimesso@surface.tu-darmstadt.de
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Abstract

Methylammonium-tin-iodide (MASnxI3, 0.9 ≤ x ≤ 1.4) systems were prepared by self assembly process in aqueous solutions. The “as-prepared” MASnxI3 systems exhibit a crystalline tetragonal structure (space group I4cm) with polyhedral-shaped crystallites. The as-prepared samples were annealed at T = 150 °C, t = 8 h under nitrogen and synthetic air. Under nitrogen, the CH3NH3SnxI3 systems adopted a cubic crystalline structure (space group P4mm) with crystallites of 2–4 μm length, whereas under air, the formation of noncrystalline phases was observed. The optical absorption spectra displayed absorption edges at 1107.0 nm (x = 0.9), 1098.6 nm (x = 1.0), and 1073.2 nm (x = 1.1), respectively, whereas at higher Sn-content (x ≥ 1.2), a broad tail of the absorbance profile was observed. The photoluminescence (PL) emission spectra (RT, λexc = 500 nm) showed major PL-events over 1 µm range and the appearance of additional bands at increasing the Sn-content. The fabrication of layers with a semiconducting behavior was demonstrated.

Keywords

nanostructurephotovoltaicpowder
Type
Invited Paper
Information
Journal of Materials Research , Volume 32 , Issue 22 , 28 November 2017 , pp. 4132 - 4141
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Copyright
Copyright © Materials Research Society 2017 

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Footnotes

Contributing Editor: Sam Zhang

References

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