Rutherford Backscattering Spectroscopy of Mass Transport by Transformation of PbI2 into CH3NH3PbI3 within np-TiO2

• Authors: F. Lang , A. Juma , V. Somsongkul , T. Dittrich , M. Arunchaiya
• Languages of publication: EN

Abstracts

EN

Mass transport during transformation of PbI2 infiltrated in nanoporous TiO2 into CH3NH3PbI3 has been
investigated by Rutherford backscattering spectroscopy
(RBS). Fast initial reaction kinetics were confirmed using
optical ex-situ and in-situ measurements. Mapping
with energy dispersive X-ray spectroscopy of the cross
section of samples revealed a homogeneous PbI2 infiltration in nanoporous TiO2 before transformation
but an accumulation of Pb and I at the surface after
transformation, in accordance with a depletion of Pb and
I in a near surface region. Quantitative depth profiles of
Pb and I were obtained from RBS analysis. An instant
degradation of CH3NH3PbI3 to PbI2 and volatiles upon
ion radiation was found. The concentration profiles of
Pb could be simulated with a one dimensional diffusion
model taking into account an effective diffusion coefficient
of Pb in the nanocomposite (about 1.5 • 10-11 cm2/s) as well
as a parameter considering frazzling at the surface due to
formation of crystallites.

Keywords

EN

CH3NH3PbI3; PbI2; nanoporous-TiO2; Rutherford backscattering spectroscopy (RBS); transport of lead; degradation

• Publisher: De Gruyter Open
• Journal: Hybrid Materials
• Year: 2015
• Volume: 1
• Issue: 1

Dates

online

22 - 12 - 2014

accepted

25 - 11 - 2014

received

30 - 9 - 2014

Contributors

author

F. Lang

• Helmholtz-Zentrum Berlin für
  Materialien und Energie GmbH, Hahn-Meitner-Platz 1, 14109 Berlin,
  Germany

author

A. Juma

• Helmholtz-Zentrum Berlin für
  Materialien und Energie GmbH, Hahn-Meitner-Platz 1, 14109 Berlin,
  Germany
• Tallinn University of Technology, Department of Materials
  Science, Ehitajate tee 5, Tallinn 19086, Estonia

author

V. Somsongkul

• Helmholtz-Zentrum Berlin für
  Materialien und Energie GmbH, Hahn-Meitner-Platz 1, 14109 Berlin,
  Germany
• Department of Materials Science,
  Faculty of Science, Kasetsart University, Bangkok 10900, Thailand

author

T. Dittrich

• Helmholtz-Zentrum Berlin für
  Materialien und Energie GmbH, Hahn-Meitner-Platz 1, 14109 Berlin,
  Germany

author

M. Arunchaiya

• Helmholtz-Zentrum Berlin für
  Materialien und Energie GmbH, Hahn-Meitner-Platz 1, 14109 Berlin,
  Germany
• Department of Materials Science,
  Faculty of Science, Kasetsart University, Bangkok 10900, Thailand

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Identifiers

DOI

10.2478/hyma-2014-0002