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Structural and compositional characteristics of vacuum deposited methylammonium lead halide perovskite layers in dependence on background pressure and substrate temperature

Wittich, Carolin and Mankel, Eric and Clemens, Oliver and Lakus-Wollny, Kerstin and Mayer, Thomas and Jaegermann, Wolfram and Kleebe, Hans-Joachim :
Structural and compositional characteristics of vacuum deposited methylammonium lead halide perovskite layers in dependence on background pressure and substrate temperature.
[Online-Edition: https://doi.org/10.1016/j.tsf.2018.02.004]
In: Thin Solid Films, 650 pp. 51-57. ISSN 00406090
[Article] , (2018)

Official URL: https://doi.org/10.1016/j.tsf.2018.02.004

Abstract

In a physical vapor deposition process for fabrication of perovskite absorber layers it is an important prerequisite for large scale application to understand the reaction steps and the impact of the deposition parameters on the structural and compositional characteristics of vacuum deposited lead halide perovskite layers. In the sequential deposition method, we found a narrow and low lying temperature window for the transformation of a vapor deposited PbCl2 base layer to CH3NH3PbI3 perovskite by reaction with evaporated CH3NH3I. To modify the deposition parameter window, we systematically varied background pressure and substrate temperature and analyzed the resulting composition using X-ray diffraction, energy-dispersive X-ray spectroscopy, and scanning electron microscopy. The resulting reaction products and byproducts CH3NH3PbI3, CH3NH3PbCl3, PbICl, PbCl2, and PbI2 were identified and the variation of their concentration in dependence of background pressure and substrate temperature is explained by discussion of a set of reaction equations and reaction mechanisms on a thermodynamic basis.

Item Type: Article
Erschienen: 2018
Creators: Wittich, Carolin and Mankel, Eric and Clemens, Oliver and Lakus-Wollny, Kerstin and Mayer, Thomas and Jaegermann, Wolfram and Kleebe, Hans-Joachim
Title: Structural and compositional characteristics of vacuum deposited methylammonium lead halide perovskite layers in dependence on background pressure and substrate temperature
Language: English
Abstract:

In a physical vapor deposition process for fabrication of perovskite absorber layers it is an important prerequisite for large scale application to understand the reaction steps and the impact of the deposition parameters on the structural and compositional characteristics of vacuum deposited lead halide perovskite layers. In the sequential deposition method, we found a narrow and low lying temperature window for the transformation of a vapor deposited PbCl2 base layer to CH3NH3PbI3 perovskite by reaction with evaporated CH3NH3I. To modify the deposition parameter window, we systematically varied background pressure and substrate temperature and analyzed the resulting composition using X-ray diffraction, energy-dispersive X-ray spectroscopy, and scanning electron microscopy. The resulting reaction products and byproducts CH3NH3PbI3, CH3NH3PbCl3, PbICl, PbCl2, and PbI2 were identified and the variation of their concentration in dependence of background pressure and substrate temperature is explained by discussion of a set of reaction equations and reaction mechanisms on a thermodynamic basis.

Journal or Publication Title: Thin Solid Films
Volume: 650
Publisher: Elsevier Science Publishing
Uncontrolled Keywords: Physical vapor deposition, Thermodynamics, Lead halide perovskite, X-ray diffraction
Divisions: 11 Department of Materials and Earth Sciences
11 Department of Materials and Earth Sciences > Earth Science
11 Department of Materials and Earth Sciences > Earth Science > Geo-Material-Science
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences > Material Science > Fachgebiet Materialdesign durch Synthese
11 Department of Materials and Earth Sciences > Material Science > Surface Science
Profile Areas
Profile Areas > Thermo-Fluids & Interfaces
Date Deposited: 05 Apr 2018 12:41
DOI: 10.1016/j.tsf.2018.02.004
Official URL: https://doi.org/10.1016/j.tsf.2018.02.004
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